●0.22 μm Pore Size, Hydrophobic PTFE Membrane, PP Shell. ●All materials passed USP class V. Materials of construction tested for biological compatibility. ●APPLICATION-Small volume exhaust. Corrosive solvent and gas filtration. Ventilation of bioreactors and fermenters. ●[ISO Certificate] Cobetter Quality Systems is compliant with ISO 9001 : 2008. Design, manufacture and sterilization processes meet cGMP requirements.