... used in hosipital,or industrial eara.,protect face from the dust,water and bacteria.3. Low breathing resistance with high filtration ... and strong electrostatic filtering materials effectively filter the solid particle dust, and prevent the oil liquid gas.6. 8. Free of ... %, ventilated, non-corrosive gases warehouseNote1.This product is good for dust proof 2.Validity:2 years 3.DisposableBFE: 90%,95%,99 ...