Gasket performance requirements
In addition to meeting the most basic sealing function accidents, the gaskets are required to have different practicability and functionality depending on the sealing medium and the working conditions of the equipment. The requirements for gaskets are generally:
1. The material has good compactness and is not easy to leak media.
2, with appropriate mechanical strength and hardness to resist the pressure of the sealing medium, and prevent the gasket from being lightened
3, has a certain compressibility and good resilience to compensate for the defects of the sealing surface and maintain a good elastic compensation
4, has a good creep resistance, to ensure that the bolt has enough residual load to maintain the sealing pressure of the gasket, to ensure the long-term sealing performance of the gasket
5, does not soften under high temperature, does not decompose, hardening at low temperature is not brittle
6, good corrosion resistance, long-term work in acid, alkali, oil and other media, its volume and hardness changes little, and does not adhere to the metal surface
7, with a softness combined with the seal
8, good aging resistance, durable
9, easy to manufacture, cheap, easy to take
10. Recyclable and non-polluting
Obviously, it is impossible for any gasket to fully meet the above requirements, but gaskets with excellent sealing performance can meet most of the above requirements.
Therefore, according to the above requirements, the main technical parameters for evaluating the performance of the gasket include: tensile curvature, elongation at break, crush strength, compression resilience, creep relaxation resistance, medium resistance, flexibility, More than 20 kinds of sealing performance, heat resistance, density, hardness, anti-adhesion ability, aging resistance.