??O-ring rubber seals always is not very comprehensive in life, besides sealing technology is in rapid development. Examples Here are several new materials and new technologies.

??(1) liquid seal O-rings: With the rapid development of polymer organic synthesis industry, in recent years there has been liquid sealant, used for static sealing; this new technology, often called the liquid seal. The principle of the liquid seal O-ring, is the use of liquid sealant adhesion, mobility and single molecule membrane effects (the thinner the film the greater the tendency of the natural reply), at the appropriate pressure, making it the same way as the rubber seals kick in. Therefore, the use of a sealant, also called liquid rubber seals.

??2) Teflon O-ring seal: PTFE is a high molecular organic compound, which before sintering into products, called the raw material, soft texture, there are also single molecule membrane effects. Made with raw material called raw material belt, it can be rolled into a disk long-term preservation. When using the freely forming any joint, as long as there is pressure, they form a uniform annular film plays a role in sealing. As the rubber O-ring seals the valve between the body and bonnet can without removing the valve or shutter, forced open a gap, into the raw material brought on line. The pressing force is small, sticky, also stick flange surface replacement is very convenient. For tongue and groove flange most appropriate. Teflon, can also be made tubular and rod for sealing.

??(3) hollow metal O-rings: good elasticity, pressing force is small, there are self-tightening effect, can choose a variety of metal materials, resulting in low temperature, high temperature and strong corrosive media can adapt.

??(4) graphite sheet ring: in people's minds, graphite is a brittle material, lack of flexibility and toughness, but after graphite special treatment, but it is soft and good elasticity. Thus, the heat resistance and chemical stability of graphite O-rings, it can be displayed on the rubber seal material; and this rubber seal pressing force is small, very favorable sealing effect. This graphite tape can be made, with the metal band with the composition of high performance wound rubber seals. Graphite sheet metal spiral wound gasket and graphite ---- arise rubber seals, high temperature corrosion resistant seal a major breakthrough. Such rubber seals, foreign countries have mass production and use