... care of people health We specialized in making face mask for more than 20 years and able tosatisfy a wide variety ... achieves 95%, and prevent the oil liquid gas;5) Use for sanding, sweeping, grinding medicine, disintegration projects, cement, agriculture and animal ... heavy metal.6) Lead time:For sample mask, the lead time is 3-5 days;For mass production, the lead time is 20-30 days ...