CHROMAFIL PTFE-20/25, BIGbox CHROMAFIL disposable syringe filters PTFE-20/25 BIGbox membrane material: polytetrafluoroethylene (PTFE) pore dia.: 0.2 µm, membrane dia.: 25 mm color code above: yellow / below: colorless former product designation CHROMAFIL O-20/25 BIGbox of 400