half face anti gas mask 1. Standard:FFP3 2. Material:Non-Woven Fabric +Melt ... used FFP3 fold flat boat form valved half gas mask/anti gas mask/half face gas mask 1.Description:Product Name:fold flat ... Casting,Cement,Wood Processing,Electronic,Semi-Conductor,Precision Manufacturing,Food,Cleaning Work,Battery,Building Materials,Chemical Synthesis,Nuclear Engineering,Minning,Petroleum ...