... seal gasket consists of pure, high-quality expanded PTFE that guarantees an almost unlimited chemical resistance and etc. TECHNICAL DATA MATERIAL: ... ageing4,Physiologically safe5,High strengthKEY BENEFITS:1,Increased residual gasket stress2,Greater blow-out resistance3,High operating safety4,Wide ... pH range 0—146,Highly conformable to the sealing surface7,Straightforward installation PTFE seal gasket