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Three-Proof (Anti-Static / Waterproof / Oil-Proof) Filter Bag for Chemical Explosive Dust. Three-proof design: anti-static, waterproof and oil-proof, safe for explosive dust working conditions. Polyester needle felt material, stable air permeability and excellent dust removal effect. Effectively prevent static spark, lower risk of dust explosion in chemical workshops. Customizable size & shape, matched with spray plastic filter cage for convenient installation. Good ash cleaning performance, not easy to stick dust, extend service life greatly.