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The 3M 9004 IN is composed of three layers. The outermost layer filters out the largest dust particles, the innermost layer preserves the respirator’s shape and the middle layer is composed of electrostatic filter media. It has the ability of these respirators to filter above 90% of 0.3-micron particulate dusts. (Scientific research has proven thatfor all dust particles sizes, 0.3 micron dust are the most difficult to filter effectively), cup shape design with aluminum nose clip, neoprene elastic band |