Briefly on the high temperature mechanical properties of gaskets

High temperatures usually have an adverse effect on the performance of gasket joints. For example, high temperature will degrade the mechanical properties of gaskets, including tensile strength, resilience (modulus of elasticity), and load-bearing capacity. In addition, most rubber-bonded asbestos or non-asbestos fiber materials (except flexible graphite) will suffer from high temperature. Decomposition, pulverization or permanent deformation occurs, and its maximum use pressure decreases with increasing temperature. Secondly, the strengthening effect of high temperature on the creep or relaxation of gaskets is also obvious. For example, under the same load, the relaxation of asbestos rubber gaskets at 200°C is 3.5 times that of room temperature; (Guide: How to describe the pressure riveting process Perform quality control)

As a substitute for asbestos, the continuous working temperature of flexible graphite gasket in oxidizing medium should also be considered not to exceed 343℃. The thermal expansion or contraction of the gasket changes the stress of the gasket, so its sealing ability also changes accordingly. In addition, thermal fluctuations or thermal cycles in the joint will cause combined gasket deformation ratchet and stress ratchet effects, and this effect depends on the gasket’s viscoplasticity and non-linear stress-strain response, temperature and other factors.

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