Use the 3M™ 8246 R95 Particulate Respirator with nuisance-level acid gas relief for chemicals such as hydrogen fluoride, sulfur dioxide and chlorine. For use in primary aluminum reductions and glass etching industries. Certified to provide at least 95% filter efficiency against solid and liquid particles including those containing oil. Not to be used in situations where the exposure exceeds the OSHA PEL. 20 per box. Meets 42 CFR84 standard.