... Product name: ET-4532 FFP2 Active Carbon Respirator without Valve ET-4542 FFP2 Active Carbo Respirator with Valve 2. ... electrostatic filtering materials effectively filter the solid particle dust, and prevent oil, liquid, gas, used for cnstructin, ... mining, textile, grinding medicine, disintergration projects, cement, agriculture and animal husbadry, cutting dust, pollutes from heavy metal.Danyang ...