O-ring seal

circularroundelastomer

Polytetrafluoroethylene (PTFE) are closed,circular rings with annular cross section. The dimensions are – as with the elastomer O-Ring – characterised by the inside diameter ID and the cord diameter W (Figure ).PTFE O-Rings are not moulded but produced by machining. The rings can therefore be manufactured in all sizes. Standard Size: AS568, GB3452.1, J ISB2407 Mediai: Practically all liquids, gases and chemicals Advantages Very good chemical résistance, compatible with most liquids and chemicals, with the exception of liquid alkaline metals and some fluorine compounds. Physiologically safe, can be sterilised. eS Suitable for contact with foodstuffs, pharmaceutical and médicinal products. Low friction, no adhésion. Materials Standard material: Virgin, unfilled PTFE (polytetrafluoroethylene) PTFE is a partially crystalline thermoplastic characterised by a very high chemical and thermal résistance. PTFE has the highest résistance to chemicals of ail plastics and can be used for almost any application.lt has a slightly limited résistance to molten alkaline metals, to elementary fluorine and to certain halogen materials. The material undergoes no changes on exposure to ageing, light and ozone. The water absorption rate is less than 0.01 %. Teflon O Rings are used wherever the chemical and thermal resistanceof the normal elastomer O-Rings is no longer sufficient. These are primarily applications in the chemical industry, foodstuffs industry, pharmaceuticals and médical technology. Teflon O-Rings are used only as static seals, e.g. on flange connections, on covers, etc.