Asbestos O Ring Gaskets for sight glass is also named asbestos cushion or cushion joint, they are made from high pressure compressed asbestos fibre rubber sheets resistant to temperatures up to 450 °C and the pressure to 150 bar. Asbestos gaskets is a traditional material for the gauge glass sealing,which is a general purpose gasket material suitable for service in hot water, mild acids, alkalines, and inert gases. Now most of western countries ban the use of asbestos products, but in some developing countries, this product is still used in large quantities.
