... With Non-toic,Non-Allergic And Non-Simulating Materials,Low Breathing Resistance With High Filtration EffIiciency3. ... Convenient And Practical8.Applicable For Hospital,Common Sanitary Protection,Mainly Used In Places With Little Dust9.Conforms ... Conductor,Precision Manufacturing,Food,Cleaning Work,Battery,Building Materials,Chemical Synthesis,Nuclear Engineering,Minning,Petroleum,Shipbuilding,Metallurgy ...