Pan PTFE Braided Manlid Seal is manufactured from an inert reinforced special fiber yarn, impregnated with PTFE and an inert resin to provide a non-stick surface. Other fiber material is available. SUNPASS PTFE Braided Seal With Silicon Core is designed for use on tank that handle aggressive cargoes under an inert gas blanket. Pan PTFE Braided Manlid Seal is divided into pure PTFE Braided Seal, impregnated PTFE Braided Seal and silicone core Braided Seal. It’s elasticity is improved by silicon core.