Description PTFE Diaphragms are designed in dosing pumps for flexibility, excellent chemical resistance and also to eliminate all other packings & seals. The driving member in dosing pump is a flexible diaphragm. Application & Usage The advantage of this arrangement is elimination of all gland packings and seals which are exposed to the liquid being pumped. This is an important feature when used with hazardous, toxic or corrosive liquids. Materials used VPTFE & Filled Grades of PTFE