Color Natural. Retention Volume (mL) <0.35. Max Pressure (PSI) 60. Max Pressure (bar) 4.1. Description PTFE Nonsterile Syringe Filters; 0.2 micron, 50 mm dia. Key Features. Ideal for sterilization of gas and alcohols; cleaning acids, alkalies, and organic solvents; venting purposes. Use with aggressive chemicals.