SGS, GMP, ISO. Origin. Zhejinag, China. HS Code. 8421999000. Product Description. 0.2 Micron Capsule Filter For Gas and Air. Hangzhou Anow Microfiltration Co., Ltd. is a well-known filtration company in Asia who focus on research and development of MCE, Nylon, PES, PVDF, PTFE membrane, with pore size ranging from 0.03 μm to 10 μm, as well as