What materials are usually used for high temperature resistant sealing rings?
High temperature resistant sealing ring is generally used: carbon fiber plus PTFE, heat resistance: 265 degrees, can be used for dynamic sealing. For static sealing, use flexible graphite to clamp metal, heat resistance: 650 degrees.
SIL silicone rubber sealing ring: has excellent heat resistance, cold resistance, ozone resistance and atmospheric aging resistance. It has good insulating properties. But the compressive strength is worse than ordinary rubber, and it is not resistant to oil. Suitable for electric water heaters, irons, microwave ovens and other household appliances.
It is also suitable for tea sets, water dispensers and other equipment that are in contact with the human body. Not recommended for most concentrated solvents, oils, concentrated acids and sodium hydroxide. The general temperature range is -55~250℃.
ACM acrylic silicone seal ring: It has excellent heat resistance and weather resistance to oil, but its mechanical strength, compression deformation rate and waterproof function are slightly inferior. It is generally used in automotive drivelines and power steering systems. Not very suitable for boiling water, brake fluid and phosphate esters. The general temperature range is -25~170℃.
In addition to meeting the general requirements for sealing ring materials, the sealing ring should also pay attention to the following conditions:
(1) Flexible and flexible;
(2) Appropriate mechanical strength, including expansion strength, expansion rate and tear strength.
(3) The quality is stable, it is not easy to solubilize in the medium, and the heat shrinkage effect (Joule effect) is small.
(4) It is easy to process and shape, and can maintain the specified specifications.
(5) Do not corrode the contact surface, do not pollute the medium, etc.
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