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types of respirators, as described below. how do respirators work?
filtering facepiece (dust masks) are generally made directly from a cloth-like filter material. chemical cartridge/gas mask respirators can be made from a variety of materials. the most popular facepiece materials are silicone, neoprene, and rubber. in general, rubber and neoprene are rigid, durable...
https://www.osha.gov/dts/shib/respiratory_protection_bulletin_2011.html