... face mask with filter 1,produced in the purification area. 2,CE ISO Approved 3,BEF90%~99% 3-ply face mask with filter1, ... 17.5*9.5cm,2, 3-ply, nonwoven face mask or with the isolation layer(melt ... in making various healthcare and medical supplies. Quality consistent with the ISO9001, ISO13485, CE standards and China State ... win-win cooperation! 3-ply face mask with filter