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North Safety Mercury Vapor, P100 MV/P100 cartridge. Mercury vapor and chlorine with End-of-Service Life Indicator and P100 (ESLI) for mercury; and 99.97% filter efficiency for all particulates. OSHA's Standard for Respiratory Protection, §29 CFR 1910.134, requires Employers to implement a change schedule for all vapor and gas cartridges when there isn't an end-of-service life indicator on the cartridge. This schedule must be site specific and take into consideration worksite humidity, worker breathing rate as well as contaminant concentrations.
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