Technical article: formaldehyde donor biocides — what’s the future?
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‘Formaldehyde donor biocides — what’s the future?’
With the impending reclassification of formaldehyde as a category 1B, presumed human carcinogen, the writing is on the wall for formaldehyde donor biocides. These compounds do not contain formaldehyde per se, but as their name suggests they release it, in very small amounts, in the process of killing bacteria. Formaldehyde donors are proven, stable and effective and for many years have been the preservatives of choice for the majority of metalworking fluid manufacturers. However, the new regulation may change that. According to Master Chemical, this reclassification emphasises why the research and development (R&D) of alternative metalworking fluids is so vital. Formulators who are completely reliant on old chemistry are certain to lose market share as those with a high commitment to R&D introduce next-generation products that are future proof.
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In September 1984, the US Environmental Protection Agency issued two documents on the subject of nitrosamines, in which it made a case for not mixing any types of amine, particularly DEA (diethanolamine) and TEA (triethanolamine), with nitrites of any kind because of the possible formation of N-nitrosodiethanolamine (NDELA), which is a suspected carcinogen. Depending on the grade of TEA purchased, there could be small to moderate amounts of DEA present in the material. In this bulletin, ...
In general, metalworking fluids are highly fire resistant. As Master Chemical explains, this is particularly true of those containing water either as part of the formulation (synthetic and semi-synthetic coolants and most liquid washing compounds) or with water cutback working solutions. In most situations, these types of fluids catch fire only after all of the water contained either in the concentrate or in the working solution has evaporated.
Craftsman Tools has found that replacing its existing coolant with Trim SC516 has reduced heavy misting issues and reduced its coolant costs by around 50 per cent.
In the field of aqueous (water-based) parts cleaning, the control of working concentration is one of the cornerstones to good cleaning and extended bath life.
While it has been said that ‘a certain percentage of the population is sensitive and/or allergic to nearly anything’, an aggressive programme of health and safety testing in independent laboratories, extensive field testing and ongoing monitoring of customer complaints ensures the number of people who experience problems with TRIM metalworking fluids is very low. It is important we understand what we can do to protect workers from potential irritants.