GYLON BIO-PRO^® seals offer a safe solution with its modified and restructured PTFE material, pre-formed and stress controlled, for all Tri-Clamp^® standards. Manufactured from our proprietary GYLON^® style 3522 modified PTFE, GYLON^® BIO-PRO PLUS^™ delivers best in class performance across all critical factors such as compliance, chemical compatibility, sealability, creep and cold flow. The new Style 3504 GYLON^® Stress Saver^® combines these proven sealing advantages with the performance characteristics of the industry recognized GYLON^® 3504. GYLON^® Style 3504 is a PTFE Gasket with aluminosilicate microsphere filler. This style gasket is widely used in glass-lined flanges and other light-duty flanges where available torque is limited.