The universal mask made by market research department after QA appraisal has P1 filtering efficiency. According to European standard CE EN 149:2001+A1:2009, PP hot-pressing needle cotton, filter material and PP needle cotton seal are used from outside to inside, and PU sealing ring is included to ensure the parameters of gas density meet the requirements. Its specific models are E9101V+, E9101+, E9101V and E9101.