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Corrosion control problems

Corrosion control is a serious problem for industry and governments worldwide.

corrosion inhibitor

Most people associate corrosion with rust, which only happens in things made of ferrous metals such as steel girders, ships, iron pipes, steel reinforcement rods, and steel tanks and is the reason metals deteriorate and fail.

Ferrous and non-ferrous metals corrode on contact with both fresh and salt water as well as water vapor. They will also corrode when they come in contact with chemicals, liquid acids as well as acidic vapors, salts and bases, and bacteria.

Read our article “Corrosion Control Solutions – A Solution To A Costly Problem” for more information about the enormity of the costs involved in failing to prevent corrosion.

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

For more information or advice please telephone us on +44 (0) 20 8281 6370 or use our contact form.

All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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Replacements for nPB

Envirotech Europe introduce low cost “drop in” replacements for nPB (n-propyl bromide) vapour degreasing solvents.

replace npb

Bad news for your business. Coronavirus, Brexit, redundancies, social distancing reduced cash flow.

If that’s not enough and you are using nPB solvent that’s another problem to worry about as its use for vapour degreasing has been banned by the EU since July. Don’t panic it’s not too late to change and comply, as we have “drop in” replacements for nPB which are guaranteed to give the same results at no increase in your costs of usage. It is late but we can give you the information to easily make the change in a day without fuss.

You have questions – of course:
How can it be so simple?

The EnSolv range of stabilised nPB based vapour degreasing solvents has been the market leader in this field worldwide for many years. EnviroTech Europe, the manufacturers, know this product inside out with hundreds of satisfied users.  We have been fighting the EU authorities for 20 years regarding classification, but with limited resources and the corporate giants with money to lose as EnSolv gained more and more of the market. Money talks so the Commission ignored the evidence and banned nPB for use as a vapour degreasing solvent with the sunset date in July 2020. If you are interested in the history, it is all explained in detail on our website.

With our extensive knowledge of user needs EnviroTech Europe, during the intervening years, have developed new compliant solvent formulations which are simple “drop-in” replacements.

No new equipment needed, guaranteed results and no extra costs to worry about.

We can’t guarantee that more changes will not happen in the future, but you will then have time to evaluate whether the new generation of wonder products which reduce global warming a smidgeon is worth the enormously increased costs.

Talk to us about whether EnSolv CC-A or ProSolv will be the best choice for your application. Advice, literature, changeover instructions are all available to make the change quickly, easily and at no extra cost of usage.

For more information about replacing nPB please visit:
www.vapour-degreasing.com/npb-replacement

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

For more information or advice please telephone us on +44 (0) 20 8281 6370 or use our contact form.

All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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Corrosion Protection Spray – SuperCORR A

SuperCORR A corrosion protection spray protects and revitalises production machines during Coronavirus lockdowns.

 

corrosion protection spray
During the COVID-19 lockdowns many factories and workshops have been closed for long or shorter but intermittent periods. With doors closed and restricted ventilation turned and polished steel surfaces on drive screws, chains and bearings can be affected by flash rusting. On start-up lubricants may have oxidised or drained from mating surfaces causing friction and wear. SuperCORR A corrosion protection spray offers a quick, effective, and easily applied answer.

Spraying a coating when shutting down machines, drives, conveyor chains and in control cabinets will prevent or displace condensation on exposed surfaces protecting against condensation. A further spray on reopening and restart displaces any surface moisture which may have accumulated and relubricates moving components.

SuperCORR A is a proprietary formulation containing no organic constituents.  A combination of long lasting synthetic anticorrosion inhibitors and lubricants that protects metal components against moisture. This unique, water displacing lubricant is non-flammable and environment friendly. ​

Unexcelled in preventing corrosion and contamination on all surfaces in mechanical close tolerance slow moving components or electrical and electronic equipment used in humid conditions. Can be used on any metal surfaces to prevent flash rusting, microbial and other forms of corrosion.

SuperCORR A forms a super thin, hydrophobic, non-flammable lubricant film with anti-corrosion properties approximately 7 microns (0.007mm) in thickness and is compliant with U.S. EPA regulations, the European Union RoHS Directives

Conforms to MIL-DTL-87177B (Revised MIL-L-87177A) specifications.

For more information please visit www.corrosion-protect.com/supercorr-a To discuss the use of SuperCORR A to solve your corrosion protection problems please use the website contact form or phone us, we look forward to hearing from you.

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

For more information or advice please telephone us on +44 (0) 20 8281 6370 or use our contact form.

All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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Replace Trichloroethylene with ProSolv

Critical Cleaning Solvent

Are you still using Trichloroethylene for Vapour Degreasing?

High performance cleaning at a lower cost than other fluorinated solvent cleaners

Trichloroethylene will not be obtainable for metal cleaning or other uses without authorisation after April 2016.

ProSolv® enables high performance cleaning at a lower cost than other fluorinated solvent cleaners. A proprietary tertiary azeotropic formulation based on a fluorinated solvent which provides a direct replacement for trichloroethylene and other chlorinated solvents.

ProSolv® is extremely stable and simple to use meeting all the increasingly stringent legislative demands for safer, non flammable solvents with a low environmental impact in the precision engineering industries.

ProSolv® can be used in most existing vapour degreasing equipment and can be used safely for immersion cleaning using ultrasonics, where it has been optimised with a high specific gravity and very low surface tension.

Unlike other chlorinated solvents ProSolv® can be used for manual cleaning in a suitably ventilated area. Typical applications are where high performance critical cleaning is required at lower cost than other fluorinated solvent cleaners. Vapour degreasing for medical, aerospace, optics, oxygen equipment service, high vacuum components and electronics.

ProSolv® is an excellent choice to replace flammable solvents such as MEK, Acetone, Iso propyl alcohol (IPA) or hydrocarbons where manual wiping or brush cleaning is the preferred cleaning method.

ProSolv® is a stable azeotrope which can be recycled by distillation for reuse through many cycles. It is a very stable mixture  with no need for monitoring or the need for additives or stabilisers.

ProSolv® offers a cost effective replacement in formulations for dip, spray or aerosol applications and as a fast drying carrier solvent for oil, silicones and other lubricants.

Click here to visit the ProSolv website

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

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All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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SuperCORR A Keeps Flight MH370 search planes flying

ABOVE:
1. The Lockheed Martin P-3 Orion is equipped with radar and infrared sensors as well as observation posts to help detect any debris on the surface of the ocean. It also has three cameras beneath the landing gear capable of zooming in for a closer look.

2. The four-engine turboprop plane is designed to fly low and slow to aid surveillance. Once it has reached the search location, one or two outer engines can be turned off to preserve fuel and extend the surveillance time.

3. The plane is also fitted with a magnetic anomaly detector (MAD) – used for detecting submarines underwater. The aircraft also has acoustic detectors, which are able to detect sound 1,000ft (304.8m) below the surface of the ocean.

SuperCORR A lubricant keeps Flight MH370 search planes flying

SuperCORR A the lubricant and anti-corrosion formulation from the CORR-EX division of EnviroTech Surface Technologies is helping in the search for the missing Malaysia Airlines flight MH370 passenger jet.

Lockheed Martin AP-3C Orion’s aircraft of the Royal Australian, Korean and Japanese Air Forces used for anti-submarine and maritime surveillance are still searching for debris in a vast area of ocean, bigger than the land area of Europe, southwest of Perth. The maintenance schedules specify SuperCORR A to lubricate and protect the flap tracks and screw jacks in the wings of the aircraft.

SuperCORR A lubricant and protective coating is widely used by the military, electronics and aerospace industries for critical applications to give the protection needed in extreme conditions. SuperCORR Adeposits a dry protective film with excellent corrosion protection and lubricant properties plus the added advantage of a hydrophobic surface rejecting water that ensures the easiest and best connections for very close spaced connectors, contacts, wiring and moving parts.

The U.S. Navy selected SuperCORR A after exhaustive testing using American Society for Testing and Materials (ASTM) Standard B117- Standard Practice for Operating Salt Spray Apparatus. SuperCORR A, a Type I, Grade B Corrosion Preventative lubricant out-performed 11 other products in comparative testing to identify a better product to protect and lubricate the flap tracks and screw jacks on the aircraft.

The flap tracks, located in the aircrafts wings, are what the flaps slide on when they move up or down to lower or increase speed. The screw jacks engage and retract the wing flaps. Corrosion on any of the surfaces can lead to snatching or vibration which can affect the pilots control.

Due to constant operation in salty and corrosive atmospheres which need post-flight rinses and monthly washing down of the aircraft re-lubrication and corrosion treatment for the flap tracks and screw jacks is required each time, with conventional lubricants, to prevent rusting.  SuperCORR A was evaluated against competitive products under the Federal Test Method Standard #791B, using a five percent Salt Spray Corrosion Test.

SuperCORR A far exceeded the other products evaluated. After over 200 hours of continuous exposure to salt spray corrosion, SuperCORR A’s protection actually increased over time where the other similar products failed early or contributed to an increase in corrosion.

The accelerated salt fog corrosion testing demonstrated that the application of SuperCORR A which complies with MIL-L-87177A also increased electrical operation to 1400 hours versus 100 hours for the control product used at that time. Technical manuals were updated to include the application for electrical and mechanical parts for civilian and military operations.

The most important conclusion from the historical data and prototype testing is the availability of this excellent corrosion preventive compound that has dry film lubricant properties. The application of SuperCORR A on aircraft components can reduce maintenance man hours, reduce part replacement costs, increase life of aircraft, increase safety, and increase readiness.

Estimates for the maintenance cost for the US Air Force F-16 fleet can reach $500 million per year, the use at all military branches could reach billions of dollars per year. Applications at locations tested by the U.S. Air Force are not normally treated with corrosion prevention and control lubricants (CPC’s) These are the electrical connectors that are susceptible to subtle and not so subtle forms of corrosion that could interfere with the electrical operation of the F-16.

Testing by the U.S. Navy at NADEP Jacksonville incorporates not only electrical connectors, but mechanical and structural components as well. Future uses will also include ground support equipment. The properties of SuperCORR A are such that it can be used on a wide variety of applications and any materials, metal or plastic. Properties of the SuperCORR A far exceed the requirements defined by the MIL-L-87177A specification. Many beneficial properties of the product are not required in the MIL specification.

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

For more information or advice please telephone us on +44 (0) 20 8281 6370 or use our contact form.

All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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EnSolv and the Environment – Update from the Co Chairman of the United Nations Ozone Assessment panel on nPB.

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Analysis of Status on Science of n-PB Effects on Ozone

White Paper By Don Wuebbles (Department of Atmospheric Sciences – University of Illinois).

November 11, 2014

There is disagreement between the use of scientific information by the European Union and the United Nations Environmental Panel / World Health Organisation (UNEP/WHO) the  authority for ozone depletion assessment. Dr. Don Weubbles acknowledged as one of the world authorities on ozone depletion and who Co Chaired the UNEP/WHO 2014 ozone assessment panel explains in detail why the official world study disagrees with the European Union Environment Agency 2014 assessment as not being supported by science.

EnSolv is safe for the environment backed by the most sophisticated and knowledgeable world scientists.

Analysis of Status on Science of n-PB Effects on Ozone

Don Wuebbles
Department of Atmospheric Sciences
University of Illinois
Urbana, IL
Phone (217) 244-1568
Email:Wuebbles@illinois.edu

November 11, 2014

I co-led chapter 5 (with Neil Harris of Cambridge University) of the 2014 WMO-UNEP ozone assessment that is currently in press (the summary, Assessment for Decision Makers, was released in September 2014 (WMO-UNEP, 2014)). Chapter 5, titled Scenarios and Information for Policymakers, of the full assessment, examines the latest understanding of a number of Ozone Depleting Substances (ODSs) including the available analyses of Very Short Lived Substances (VSLS) like n-propyl bromide (n-PB; C3H7Br). The full assessment will be released in early 2015 as a web-based report.

In Chapter 5 of the full assessment, we include the following text related to the evaluation of VSLS like n-PB:

Table 5-3 shows analyses of the spatial dependence in ODPs for VSLS primarily based on results using different versions of the NCAR global 3-D model (Wuebbles et al., 2009, 2011; Patten and Wuebbles, 2010; Youn et al., 2010; Patten et al., 2011). Note that this model calculates an atmospheric lifetime of 53.7 years for CFC-11, so the published ODPs would not be significantly affected by the revised SPARC (2013) lifetime for CFC-11. In these studies, the VSLS examined all have quite small ODPs based on emissions occurring primarily at midlatitudes. New approaches for estimating VSLS ODPs have been developed since WMO (2011) based on Lagrangian models (Tegtmeier et al., 2012; Pisso et al., 2010; Brioude et al., 2010), with similar findings to previous studies, except for emissions in the tropics where a different treatment of convection may allow for more VSLS (and their products) to reach the stratosphere.

The reported atmospheric lifetime and Ozone Depletion Potential (ODP) for n-PB in Table 5-3 for midlatitude emissions (30-60N), based on the 3-D chemistry-climate modeling studies of Wuebbles et al. (2011), are 24.7 days and 0.0049, respectively.

At the same time, we noted:

Earlier studies (Wuebbles et al., 1999, 2001; Olsen et al., 2000; Bridgeman et al., 2000) have shown that the ODPs for short-lived compounds depend greatly on when or where the emissions occur, with the largest ODPs being found for emissions in the tropics. Although it is generally expected that most emissions from anthropogenic emissions of VSLS will occur at Northern midlatitudes, there is no guarantee of this and the locations of future emissions could change.

In addition, we also reported upon an indirect study of the ODP using a semi-empirical approach based on the Lagrangian model analysis of Brioude et al. (2010). The results in Table 5-4 of WMO-UNEP Chapter 5 are taken from the Supplementary materials for that published paper. The results in Table 5-4 are quite a bit higher than Wuebbles et al. (2011) and show an ODP for n-PB of 0.0235 (0.0150-0.032) for North America emissions and 0.0150 (0.0070-0.0260) for European emissions. However, as noted in the chapter, the Brioude et al. results may be an overestimate because they do not properly account for reaction loss in the troposphere and therefore may have overestimated the amount of n-PB reaching the stratosphere. As stated in the Chapter:

The recent modeling studies also re-emphasize the point that VSLS ODPs are very dependent on the location of emissions, and not just the latitude; for example, by co-location with efficient vertical transport by deep convection into the stratosphere (semi-empirical ODPs as a function of specific locations of emissions based on Brioude et al. (2010) are shown in Table 5-4). Brioude et al. (2010) showed that these factors are more important than regional variations in VSLS losses by OH or photolysis. Using CO-like emissions to represent anthropogenic VSLS, they estimated ODPs for various compounds and found maximum ODPs over the Indian sub-continent varying from 0.079 in winter to 0.29 in summer for n-propyl bromide (C3H7Br or nPB) and from 0.13 in winter to 0.83 in summer for CH3I. Pisso et al. (2010) applied their new methodology to an nPB-like tracer with a lifetime of 20 days. They also found higher ODPs over southeast Asia in the summer (and over western Pacific in winter). In July in the tropics (30°N-30°S), ODPs varied from 0.33 in runs with convection to 0.17 in runs with no convection. Locally, values over southeast Asia are as high as 1.00. In general the results from these Lagrangian studies predict higher ODPs regionally compared to the global model results. These differences highlight uncertainties in simulating the transport of VSLS, with boundary layer mixing, convection depth and advection strength all possibly leading to local differences in VSLS delivery to the stratosphere (e.g., see Hossaini et al., 2012b; Feng et al., 2011; Hoyle et al. 2011). The global model studies (e.g., Wuebbles et al., 2011) used a full chemical treatment for VSLS and CFC-11 degradation in the stratosphere and more realistic degradation and wet deposition schemes for VSLS in the troposphere than the Lagrangian based studies (e.g., Tegtmeier et al., 2012; Pisso et al., 2010), leading to less VSLS reaching the stratosphere. Overall, these results point to potentially more important impacts from VSLS if emissions occur in regions close to convective regions in the tropics.

The 2014 report from the European Environment Agency, Ozone-Depleting Substances 2013, examines the European reporting requirement for n-PB and determines a total import of nPB to Europe of 1014.3 metric tonnes and a weighted ODP-tonnes for imported nPB of 101.4. This suggests they used an ODP of 0.1 for n-PB. This is far too large by either the Wuebbles et al. (2011) or the Brioude et al. (2010) analyses by roughly a factor of 6.7 for Europe emissions using the Brioude et al approach and a factor of 20.4 using the Wuebbles et al. 3-D model results. Because Wuebbles et al. may have underestimated the convection based on the observations used in the Brioude et al. study, the reality is likely somewhere between the two results, but this still suggests that the European Environment agency still used an ODP a factor of 10 or more too large. The science does not support the ODP used by the European Environment Agency.

References
Bridgeman, C.H., J.A. Pyle, and D E. Shallcross, A three-dimensional model calculation of the ozone depletion potential of 1-bromopropane (1-C3H7Br), J. Geophys. Res., 105, 26,493-26,502, 2000.

Brioude, J., R.W. Portmann, J.S. Daniel, O.R. Cooper, G.J. Frost, K.H. Rosenlof, C. Granier, A.R. Ravishankara, S.A. Montzka, and A. Stohl, Variations in ozone depletion potentials of very short-lived substances with season and emission region, Geophys. Res. Lett., 37, L19804, doi: 10.1029/2010GL044856, 2010.

European Environment Agency, 2014: Ozone-Depleting Substances 2013. EEA Technical Report No. 14/2014, Copenhagen.

Olsen, S.C., B.J. Hannegan, X. Zhu, and M.J. Prather, Evaluating ozone depletion from very short-lived halocarbons, Geophys. Res. Lett., 27, 1475-1478, 2000.

Patten, K.O., and D.J. Wuebbles, Atmospheric lifetimes and Ozone Depletion Potentials of trans-1-chloro-3,3,3-trifluoropropylene and trans-1,2-dichloroethylene in a three-dimensional model, Atmos. Chem. Phys., 10, 10867-10874, 2010.

Patten, K.O., V.G. Khamaganov, V.L. Orkin, S.L. Baughcum, and D.J. Wuebbles, OH reaction rate constant, IR absorption spectrum, ozone depletion potentials and global warming potentials of 2-bromo-3,3,3-trifluoropropene, J. Geophys. Res., 116, D24307, doi:10.1029/2011JD016518, 2011.

Pisso, I., P.H. Haynes, and K.S. Law, Emission location dependent ozone depletion potentials for very short-lived halogenated species, Atmos. Chem. Phys., 10, 12025-12036, 2010.

SPARC (Stratospheric Processes And their Role in Climate), Report on the lifetimes of stratospheric ozone-depleting substances, their replacements, and related species, M. Ko, P. Newman, S. Reimann, S. Strahan (Eds.), SPARC Report No. 6, WCRP-15, Zurich, Switzerland, 2013

Tegtmeier, S., K. Krüger, B. Quack, E.L. Atlas, I. Pisso, A. Stohl, and X. Yang, Emission and transport of bromocarbons: from the West Pacific ocean into the stratosphere, Atmos. Chem. Phys., 12, 10633-10648, doi:10.5194/acp-12-10633-2012, 2012.

WMO-UNEP (coauthor), 2014: Assessment for Decision-Makers: Scientific Assessment of Ozone Depletion 2014. WMO Global Ozone Research and Monitoring Project – Report No. 56, Geneva, Switzerland; also available on WMO website.

Wuebbles, D.J., K.O. Patten, M.T. Johnson, and R. Kotamarthi, New methodology for Ozone Depletion Potentials of short-lived compounds: n-Propyl bromide as an example, J. Geophys. Res., 106, 14551-14771, 2001.

Wuebbles, D.J., D. Youn, K. Patten, D. Wang, and M. Martinez-Aviles, Metrics for ozone and climate: Three-dimensional modeling studies of Ozone Depletion Potentials and Indirect Global Warming Potentials, in Twenty Years of Ozone Depletion, C. Zerefos, G. Contopoulos, and G. Skalkeas, editors, Springer Publishing, Dordrecht, The Netherlands, doi: 10.1007/978-90-481-2469-5, p. 297-326, 2009.
Wuebbles, D.J., K. Patten, D. Wang, D. Youn, M. Martínez-Avilés, and J. Francisco, Three-dimensional model evaluation of the Ozone Depletion Potentials for n-propyl bromide, trichloroethylene and perchloroethylene, Atmos. Chem. Phys., 2011, 11, 2371-2380, 2011.

Youn, D., K.O. Patten, D.J. Wuebbles, H. Lee, and C.-W. So, Potential impacts of iodinated replacement compounds CF3I and CH3I on atmospheric ozone: a three-dimensional modeling study, Atmos. Chem. Phys., 10, 10129-10144, 2010.

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Oxygen Cleaning

Cleaning For Oxygen Service Whitepaper

White Paper By Phil Dale (Co-contributor Handbook for Critical Cleaning – Liquid Displacement Drying Techniques).

Cleaning for oxygen service is best defined as the removal of combustible contaminants from the surface of any equipment or system in oxygen service, including all parts thereof. Essentially, any component that may come into contact with an oxygen rich environment.

The combustible contaminants include organic and inorganic substances such as hydrocarbon material for example oils and greases, paper, fibre, coal dust, solvents, weld slag, rust, sand and dirt. If these contaminants are not removed properly, in a worst case scenario, this can cause combustion in an oxygen atmosphere or at the least rejection of the product due to unacceptable product purity.

Oxygen in its own right is not flammable but it supports combustion. Oxygen can react with most materials. The higher the oxygen content and/or pressure in a system the more vigorous the combustion and the lower the ignition temperature required. Materials that do not normally ignite in atmospheric air will burn and may explode in an oxygen rich environment. In addition the oxygen rich environment will give rise to a higher flame temperature and combustion velocity and the devastating consequences thereof.

The recognition of oxygen’s reactivity has led to stringent requirements regarding the cleanliness of equipment in oxygen service. Strict guidelines exist to ensure that care must be taken in the selection of equipment including all materials and components, all of which need to be oxygen compatible. They must also be free from combustible contaminants as described above.

With this in mind special consideration must be given to any cleaning processes employed in the manufacture and maintenance of all oxygen service systems.

Specific consideration must be given to the following:

  • cleaning standard to be achieved (how clean is clean?)
  • cleaning procedure specified (or not)
  • cleaning agent to be used
  • surface properties of the parts to be cleaned
  • shape and geometry of the material
  • types and amounts of contaminants
  • the degree of automation required

The size and capacity of the equipment is determined from:

  • the size of the material or components to be cleaned
  • the required throughput

Your starting point should be the cleaning standard and procedure. For example *G93 indicates that solvent cleaning is preferable. Solvent cleaning and solvent vapour phase cleaning of components consists of the removal of contaminants by immersion in the solvent, possibly with the addition of ultrasonic agitation and the action of continued condensation of solvent vapour on the component surfaces. The procedure requires that the oxygen equipment, system or component is colder than the solvent boiling point. This allows the vapour to condense on the components and perform a final rinse.

The major significant advantage of solvent cleaning is that re-vaporised solvent is always clean and the contaminants remain in the evaporator liquid section which requires only periodic cleaning out, thus causing a reduction in the frequency of system downtime.

It is also important to note **G127–95 (Reapproved 2000). The effectiveness of a particular cleaning agent depends upon the method by which it is used, the nature and type of the contaminants and the characteristics of the article being cleaned, such as size, shape, and material. Final evaluation of the cleaning agent should include testing of actual products and production processes.

All equipment must, together with the cleaning chemistry, fulfil as a minimum the legislation for health, safety and environment.

The choice of equipment has to be based on the efficiency of cleaning versus cost bearing in mind what is the cost of the problem? If there is no cost there is no problem.

The efficiency is controlled by utilising typical samples, written procedures and requested criteria for cleanliness.

If you need to clean to ASTM G93 – 03(2011) Standard Practice for Cleaning Methods and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched Environments then all of the above needs to be given due consideration.

*G93 – Standard Practice for Cleaning Methods and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched Environments

**Designation: G127 –95(Reapproved 2000) Standard Guide for the Selection of Cleaning Agents for Oxygen Systems.

Handbook for Critical Cleaning, Second Edition – 2 Volume Set Hardcover – April 4, 2011by Barbara Kanegsberg (Editor), Edward Kanegsberg (Editor)

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New study disputes TLV for nPB

A detailed comprehensive review of 1-bromopropane studies confirm current recommendations by EnviroTech for occupational exposure levels for safe usage of EnSolv® as a vapour degreasing solvent.

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Update on a safe occupational exposure level for 1-Bromopropane
Prepared for EnviroTech Europe, Ltd.
Prepared by Dr. Mark Stelljes
SLR International Corporation
September 2014

Executive Summary
This paper re-evaluates EnviroTech Europe’s (ETE’s) current occupational exposure level recommendation of 100 ppm for 1-bromopropane (1-BP) [106-94-5] in the vapor degreasing industry in light of the recent lowering of the ACGIH Toxicity Threshold Value (TLV) from 10 ppm to 0.1 ppm. The 0.1 ppm value is based on a study of 86 workers exposed to 1-BP during its manufacturing in China in four different facilities. The authors reported significant effects at all 1-BP exposure levels down to 1.28 ppm. The 1-BP in these facilities had concentrations of the isomer 2-bromopropane [75-26-3] (2-BP) present as a contaminant at about 10-20 times the level sold for vapor degreasing.

There are several factors that undermine the conclusions reached in the paper that a concentration of 1.28 ppm resulted in toxicity in exposed workers. These factors were related to:

(1) Exposure measurements – passive rather than active samplers were used, and concentrations varied by more than tenfold for the same activity.

(2) Exposure via other routes in addition to inhalation – described worker activities indicate substantial dermal exposure, which increases the overall dose of the chemical relative to just inhalation exposure.

(3) Exposure to other chemicals – at least 20% of the workers were previously exposed to 2-bromopropane
(2-BP), and no testing was done for other chemical exposure.

(4) Statistical methods and interpretations – instead of using paired patient-exposure data, authors categorized exposure into groups (e.g., high, low); this resulted in apparent statistical relationships that may not be biologically relevant.

(5) Lack of robust dose-response relationships – when evaluating typical doseresponse relationships, only a single parameter (vibration sense in the toes, a subjective parameter) was shown to be significantly different across all dose levels.

(6) The outcome of the subjective vibration sense test was in part dependent on the testing doctor – this dependency should remove the test and its results from consideration in the paper as a scientifically defensible endpoint.

When all of this information is considered as a whole, it is unlikely that the 1.28 ppm lowest effect concentration reported in the paper is accurate. The interpretations in the Li et al. study are inconsistent with expectations based on the ways in which 1-BP acts in rodents relative to humans. Studies on how 1-BP acts in the body of rats and mice and studies on metabolism of the chemical in humans indicate that humans should be no
more sensitive to 1-BP than either of these rodents.

Based on the weight of evidence available for the toxicity of 1-BP in humans and rodents, there is no credible scientific reason to target an occupational concentration as low as 10 ppm or 0.1 ppm. ETE’s current recommendation of 100 ppm should be maintained, and employers together with vapor degreasing personnel should not be concerned about the much lower levels recommended by the ACGIH.

Click here to read the full article or download the report

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ACGIH Threshold For N-Propyl Bromide Solvents

What You Should Know About The ACGIH’s Threshold For nPB Solvents

If you work with industrial chemicals, materials or solvents then you may have heard of the American Conference of Governmental Industrial Hygienists (ACGIH). The ACGIH is a scientific, but non-governmental body of industrial hygienists that publishes Threshold Limit Value (TLV) opinions on chemicals such as n-propyl bromide the base solvent for EnSolv formulations. These TLV opinions are not held to the same standards as limits set by an organization such as OSHA in the USA, but are still published in books available on the ACGIH website. You or someone else in your company might be familiar with these TLVs.

In March 2014, the ACGIH published a new TLV for n-propyl bromide (1-bromopropane). This TLV was set at 0.1ppm, and refers to “commercial grade bromopropane (99% 1-BP with 0.1%-0.2% 2-bromopropane).” 2-bromopropane is also known as isopropyl bromide (iPB). Modern nPB manufacturing processes result in nPB with <0.01% iPB contamination, which is of a pharmaceutical quality.

The 1-BP (nPB) properties referenced by the ACGIH rely to some degree on information first published in 1999 and 2000, which contains information that is out of date and inaccurate when referring to today’s purity of 1-BP. Some of the things to keep in mind regarding ACGIH TLV opinions include:

  • TLVs are not determined by speaking openly with scientific experts, but in closed-
  • Door meetings.
  • There is no scientific consensus backing up ACGIH’s findings.
  • ACGIH TLV opinions may involve conflicts of interest and uncertain science.
  • The ACGIH is a not-for-profit organization that funds its activities by selling books; it is not a government-sanctioned panel of experts.

The IBSA et al. v. ACGIH lawsuit documents a number of these concerns involving the ACGIH and how they determine their TLV opinions. There is nothing worse than misinformation in our field – not only are safer chemicals such as nPB made to seem dangerous, but chemicals that are unsafe or unsuitable might be seen as acceptable alternatives.

It is of great concern to that in spite of the very demanding regulations already in effect in Europe some manufacturers of very expensive “new” fluorocarbon alternatives to the less expensive conventional solvents choose to imply that recent ACGIH recommendation for a reduction of exposure limits will have legal effect in Europe. This wrong and no credence should be given by users to any “recommendations” except those issued by government regulators.

The EU will establish DNEL (Derived No Effect Level) recommendations under the REACH legislation in due course and until these are issued all properly designed and maintained equipment is perfectly safe for use for vapour degreasing and any suggestion to the contrary may cause unnecessary confusion and restrict the use of this very useful technology.

EnviroTech Europe urges you and others in your company not to rely solely on TLVs, but rather on official and informed sources instead (See US EPA SNAP Approval for 1-BP). For more information on the properties of nPB and related solvents, please visit www.vapour-degreasing.com.

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

For more information or advice please telephone us on +44 (0) 20 8281 6370 or use our contact form.

All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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Clarea solvent cleaners

New Solvent Cleaning Products Launched.

Clarea industrial solvent cleaners are used in many industries to remove dirt, oil, grease, or other contaminants from surfaces without causing harm or leaving residue. They are used as parts washers in manufacturing or automotive industries or are used as wipe cleaners for large surface areas prior to painting or powder coating.

Click here to read more about Clarea

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

For more information or advice please telephone us on +44 (0) 20 8281 6370 or use our contact form.

All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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Condensation cleaning, the future for solvent degreasing

Innovation driven by legislation

Vapour degreasing is the simplest but most effective degreasing and cleaning process. It has, until recently, been subject to little change since it was first invented in the early part of the last century. The name for the process is a misnomer as the cleaning is actually achieved by solvent vapour condensing on the cooler target parts and the hot liquid solvent dissolving oil and removing dirt.

Vapour degreasing is a mature technology on which legislation is now effecting changes so fundamental that the more accurate name for the process “Condensation Cleaning” should be used to reflect the way in which it works. More importantly the alternatives in equipment design and fundamental differences in the technologies which guarantee its continuing use in the future need to be considered and understood.

In Europe the United States and in other advanced industrialised economies increasingly stringent legislation to control emissions of VOCs and especially solvents has led to new formulations for paints and other coatings where water replaces most of the solvent. In the early days of these changes the quality of the coatings was not as good as solvent based coatings but innovation has driven the development of new polymers and the results are now as good as, if not better than, the solvent based originals.

As with coatings, cleaning systems have had to change. With increased legislation concerning the regulation of health and environmental safety uses of solvent have been targeted and alternatives are encouraged by the relevant authorities and law makers often without serious consideration of unintended consequences.

For example water based cleaning is the obvious alternative but this has many disadvantages compared to condensation cleaning as although the machines are simple and relatively cheap the processes require multiple tanks for immersion or spray processing or long programmed cycles in batch machines for cleaning, rinsing and drying. Water based processes are slow, energy intensive and occupy more floor space than condensation cleaning equivalent where only one tank with small footprint is needed delivering shorter process times and most importantly using minimal energy.

The ideal cleaning process would be Condensation cleaning with water but due to the physical characteristics of the vapour/steam and the inability to carry onto the surface of the targeted parts surfactants to remove the oil, grease and soils and the difficulty of rinsing and especially drying this will only ever be a dream.

Halogenated hydrocarbons are the solvents of choice for Condensation cleaning. The process is essentially simple. A tank with a sump to contain the solvent, heaters at the base and condensation coils around the top section to control the height of the vapour is all that is needed. When heated in the sump halogenated solvents produce, in most cases, a saturated vapour between 3 and 4 times heavier than air at a temperature greater than the ambient temperature of the parts to be cleaned. This allows the solvent vapour to condense on the surface. The condensate dissolves the contaminants such as oil, greases and soils returning the used solvent into the sump of the machine for recycling into vapour which continuously condenses onto the parts until they have achieved vapour temperature when, with no further condensation, the process is complete. Parts removed from the cleaning machines are very clean, warm and dry.

The most common halogenated solvents, in use for commercial purposes, are non-flammable so present no risk in this process. Perchloroethylene, used mainly for dry cleaning, methylene chloride used widely in paint strippers and trichloroethylene used for vapour degreasing were the original materials used based on chlorine chemistry. However continuing concern about the environmental impact and danger to operators by exposure to chlorine based solvents, especially trichloroethylene, has led to a continuing search for safer alternatives.

Genklene from ICI and Chlorothene from Dow Chemicals, both of which were based on another chlorinated solvent 1.1.1. trichloroethane, were to become ubiquitous in the mid part of the last century as a much safer, non carcinogenic replacement for trichloroethylene. An excellent solvent safe for users but which, with increased awareness of the environmental impact of solvents, proved to be depleting the protective ozone layer around the Earth was subsequently banned. Trichloroethylene was then allowed to be used again as a substitute for trichloroethane but with increased restrictions on its use, even though safer materials were already available. With the development of the REACH legislation in Europe, which now classifies trichloroethylene as a human carcinogen, usage will be even more difficult but will probably be authorised in machines which control factory emissions to very low figures close to zero.

Meanwhile n-propyl bromide (nPB) based cleaning solvents such as EnSolv were developed in the United States as a drop in replacement for the ubiquitous 1.1.1.trichloroethane. nPB has an identical profile, stable, non-flammable, with the same physical characteristics such as boiling point and specific gravity and it is an excellent cleaning solvent but without the potential for ozone depletion.

During this time new halogenated blends using trans1.2 dichloroethylene, a highly flammable solvent with similar chemistry to trichloroethylene were also developed for condensation cleaning. The trans 1.2 dichloroethylene is blended with a variety of different fluorocarbon liquids which are not suitable as cleaning solvents, as they have very low solvency, but are used in these blends as a fire retardants. An extremely expensive answer to a simple problem, already solved by the development of machines able to safely use the cheaper solvents.

As with all legislation for chemical use regulation and restrictions drive development of associated processes and equipment. The most important developments in affordable machines to use solvents for condensation cleaning use two different approaches and raise difficult questions as to which is the best most economical and simplest in use.

The single tank hermetically sealed machines favoured by mainly German manufacturers uses a process tank to contain the solvent and a separate storage tank/vapour generator. Baskets with parts to be cleaned are loaded from the top and lowered into the process tank. A lid then closes over the tank and is hermetically sealed. Solvent is pumped into the process tank. Baskets are immersed in the solvent where agitation, ultrasonics or pumped liquid is circulated through the parts.

When the immersion process is complete solvent is pumped to the storage tank and vapour fed to the process tank from a vapour generator for rinsing and drying. Condensing coils/panels controlling the vapour height are linked to coils located within the vapour zone which, when the cycle is complete, collapse the vapour. The process tank is emptied. The saturated air/solvent from the process tank is then recycled through carbon absorption units to remove traces of solvent from the air until the concentration is below 2 grams per cubic metre when the lid opens automatically for the basket of parts, clean and dry, to be removed and replaced with a further basket.

Variations within the hermetically sealed tank are possible using sprays of cold or hot condensed solvent, immersion with or without ultrasonics and revolving baskets to cover most of the problems experienced when processing machined and fabricated parts. Continuous external distillation of the contents of the vapour generator is also an option depending on contamination

The alternative technology is much simpler and cheaper using well tried techniques not requiring the long recovery times of the one tank processes. This is favoured by U.K. based manufacturers. The multilevel system shown in the diagram uses a standard vapour degreasing tank design with a sealed loading section above the process tank.

Work baskets are fed to the load section from a hoist or conveyor. The loading door is then pneumatically sealed to hermetically isolate the process. The sealing lid on the process tank is opened and the basket lowered into the cleaning tank which can be simple condensation cleaning with vapour generator below or an offset generator can be used with the lower section being filled with clean solvent for immersion cleaning with or without ultrasonics or power sprays. Revolving baskets can also be added to improve cleaning in blind or through holes or oil ways in castings and fabrications.

When the process is complete the basket rises to the freeboard area where the condensation coils are located and parts allowed to drain and dry. The tank seal opens to allow the basket into the load section while the lid closes again across the process tank. A fan is then activated which produces a negative vacuum in the load area. The loading door is then partially opened to allow a flow of air through the loading section which is exhausted to atmosphere or can be recycled through carbon absorption systems if no external exhaust is preferred. As baskets entering the loading space contain parts drained and dried only very small amounts of solvent are carried in the exhausted air which is monitored to ensure compliance with local legislation. When this is achieved the door opens fully for removal of basket. The loading section can be fitted with top or side sealed doors allowing baskets to flow through on conveyor systems or be loaded from hoists. No solvent enters the work area.

Both processes will produce parts cleaned to the highest standards but the choice of which offers the best solution needs a little more consideration.

The single tank process is complicated with the need to move liquids in the machine. It is relatively slow as the carbon adsorption process needs to remove high levels of solvent from the recirculated airstream from the process tank. This is inefficient as adsorption rates for carbon fall rapidly with increasing saturation. Final levels of solvent in the tank when the lid opens will be dragged into the workshop and the area in which the operator is working. Long process cycles reduce throughput.

The simpler multilevel systems where movement of liquids is not required are more efficient and offer much faster process times. Cost of manufacture is also cheaper as no liquid movement is involved. The extracted loading section ensures no leakage of solvent into the work area which offers complete safety for operators and factory staff. The disadvantage of the multilevel machine is the height of the equipment compared to the single tank machine. This will often require the equipment be installed in a pit for easy access.
Both designs of process machines fully comply with the emission regulations of the EU and U.S authorities. Which to choose will depend on many factors which should be discussed with both the equipment and solvent suppliers who have the experience to advise on which offers the best process for the application. Equipment and solvent must work together and it is advisable to ensure that the suppliers work closely together to offer a package with high levels of responsible care and product stewardship to ensure the best and safest installation.

The Condensation cleaning process still gives the highest levels of economical cleaning with minimum energy usage, low footprint on the factory floor, safety for the operator, and high production rates with low solvent usage or environmental impact. With the new generation of sealed cleaning machines its future as the process of choice is assured. 

Syd Treacher is a consultant for industrial cleaning processes

Drawing by kind permission of CC Hydrosonics Ltd www.cchydrosonics.com

We can provide you with a Material Safety Data Sheets, independent laboratory reports, product samples and technical assistance..

For more information or advice please telephone us on +44 (0) 20 8281 6370 or use our contact form.

All of our products are manufactured, supplied and supported by EnviroTech Europe Ltd and are available on short delivery times through our dedicated team of distributors worldwide.

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