The Classroom – October 2023
Posted October 1, 2023
The Classroom – October 2023
Q Filtering cartridges I have a question about the filtering cartridges used with masks during the application of formic acid and the vaporization treatment with oxalic acid. When should they be changed? At what point does their effectiveness no longer provide the necessary protection? Marie-Hélène Majeau Québec, August A These are very important questions. All …
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