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Posted By halesowen Baggie
I have purchased an ABEK half mask for temporary use while an exhaust system is installed.
The protection needed is for a chemical that contains <20% Methanol and <50% 2 amino ethanol (very low 3ppm 8 hour twa).
How often in peoples experience should I replace the ABEK filters for operators in general. operators are in contact with substance for very short periods of time frequently.
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Posted By Roger Uncles
Look at Part 2 of HSG53
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Posted By halesowen Baggie
Can somebody give me the boiling point of methanol?
The data sheet for the chemical gives a boiling point of 110 degrees c, methanol has a boiling point much lower than that and would need an AX filter if it was the sole ingredient.
Now do I take the data sheet 100 degrees and buy ABEK masks or do I buy AX filters because Methanol has (I think) a boiling point of below 65 degrees??
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Posted By JEB
I would recommend that you discuss with the manufactures of the filters, ensure you have all the relevant facts regarding the airborne concentrations, periods of use etc before you do. I recall that some filters, no matter what period of use is during the shift, can only be used for one shift once opened.
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Posted By cara w
I had the exact same query in my previous employment - contacted manufacturers (Sundstrom) who were unable to tell me how often the filters need replacing, stating that it would depend on length of use/ type of use etc.
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Posted By ian milne
I would recommend that you check with a few manufacturers as their opinions are different (based on product hype / capabilities). The reasons they usually dont tell you when to replace filters is that chemical strengths and work conditions vary considerably and they do not wish to be held liable (plus the sales, the sales - oops).
You could go withc the AX added onto ABEK filter but your neck and jaw would get sore eventually. Ax is usualy worn for this type of duty but trials often determine effectiveness in absense of data.
Often, these mask filters are worn until chemical smells are realised by the user as once opened and exposed, the chemical will eventually migrate through via absorption and time and thats what the HSE recognise under the guidance.
Hope info helps!
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