Available Micron Rating: 0.1um, 0.2um (0.01um in a gas), 0.45um,0.65um,1.0um, 3.0um,5um and 0.01um: Regulatory Compliance: The filters are constructed with polypropylene resins and filtration media in compliance with 21CFR Part 177 of the US Code of Federal Regulations and USP Class VI Biological Test for Plastic.