> The supplier tells me I need a mask FFP 3 S/L.  I can see no reference to this
> in my cataloge of respirators.  Could some one advise me to which type of
> protection I should use?

A little obscure Haz-Mat trivia is appropriate here...

They referenced an outdated European spec, "EN149 circa 1991", which included
separate designations for "Solid" (S) and "Solid and Liquid" (SL).

EN149 circa 2001 raised the standards, requiring all particulate respirators to
have protection against both "solid" (non-oil) and "liquid" (oil)
aerosols, making
the individual "S" and "SL" designations obsolete, and simplifying
things to FFP1,
FFP2, and FFP3, with all being capable of handling both "solids" and "liquids"
in all their various forms.

So, you want an "FFP3" respirator, if such designations exist in Canada.

If not, you want at least something equal to the older "FFP3 SL" designation.
You do not want the old "FFP3 S" designation, as oxalic vapor would be
"liquid", regardless of which specs were lying about.

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