... material: widly used in medical health gauze mask; protecting mask; dustproof mask. JH series dustproof/mask filter,using superfine fibrous filter medium which is ... technique.They are widly used in medical health gauze mask,protecting mask,dustproof mask and so on. According with GB6223-86UDC641.89, ... Safety and Health(NIOSH),EN149 of EU.There usually are N95,N99,N100,P1,P2,P3.FILTER MATERIAL FOR PLANE ...