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