... woven face mask, 2-ply, 3-ply, 4-plySanitation and quality in accordance with CE, ISO9001, ISO13485 standardsCharacteristic:1 ... ) No stimulus to human skin5) Filter bacteria and dust6) Used for clinical and workshopSpecification:1) Material: 2-ply 20gsm PP ... medical enterprise, the chemical enterprise, the painting workshop, the leather industry, and the environmental sanitation unit.we also can pack ...