Creep Relaxation Behavior

Mechanical Performance of Gaskets

In the previous two issues of this chapter covering creep relaxation, we have elaborated on the creep relaxation of gaskets. Next, we will further dive into the topic: what methods are available to evaluate the creep relaxation resistance of gaskets?

Creep Relaxation Performance of Gaskets

Two Characterization Methods

To accurately assess the creep relaxation capacity of gaskets, the industry adopts two standardized characterization methods complying with different test standards.

BMCMMC: High-temperature and high-pressure resistant high-performance sealing gaskets

Creep Relaxation Rate This parameter reflects the change in gasket stress via variations in bolt elongation (bolt elongation corresponds to bolt load variation). Its core calculation relies on the initial elongation of the effective bolt length upon assembly, and the elongation difference after creep occurs in the gasket.

BMCRIN: Excellent compression resilience and sealing performance

Stress Relaxation Rate This parameter directly measures the variation in gasket stress before and after creep. Calculation is based on two sets of values: the initial compressive stress on the gasket and the residual stress after creep stabilizes.

These two methods quantify performance from distinct dimensions and provide data support for gasket selection.

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For sealing leakage issues, Baohua provides solutions. If you have any doubts about sealing technology, please pay attention to Suzhou Baohua and feel free to consult, comment, or leave a message!  Thank you! We will continue to talk about creep relaxation in the next issue. See you next time!