Virgin/Pure PTFE Sheet ZW 7500 is universal gasket produced from 100% PTFE. Thanks to the excellent in versatile chemical resistance, very low friction, wide working temperature range –100°C to +150°C, and inherent clean, ZW 7500 has been widely adopted in oil refinery, chemical processing, pharmaceutical, and foodstuff industry. Maximum service pressure is limit to 10 bars.

Enveloping gasket is machined from virgin PTFE and inserted with Non-Asbestos or rubber filler. It is one of the most popular gaskets and well suited to general application except for corrosive media or thicker filler. Maximum service pressure is limit to 20 bars.

Sigma has unique biaxial fibrillated structure and excellent dimensional stability, and maximum reduction in creep and stress relaxation of PTFE by combining these fillers. The PTFE material has excellent chemical resistance (pH 0 ~ 14) and good cleanliness can be widely used for alkali and corrosive fluids, very suitable for food, medicine, electronics (except hydrofluoric acid), and pressure range from vacuum to 8.5MPa. SIGMA sheet gasket is softer and lower stress requirement than pure PTFE, it can be used in glass lined, plastic, ceramic flange; and good sealing performance to slender or damaged flange surface, or low loading conditions.