Selecting A Sealing Elastomer

The selection of a sealing elastomer may seem daunting. By first understanding the basic chemical alternatives and properties, however, the selection process is simplified. Knowledge of an elastomer's properties is useful in predicting seal performance. The proper combination of chemical compatibility, thermal stability, contamination potential and physical properties will provide the user with the optimum seal.

The seal industry uses many tests to determine an elastomer's chemical and thermal compatibility as well as physical properties which can have a great influence on the performance in high-pressure or vacuum environments. These properties can provide an insight into the mode of degradation or the retention of sealing properties-all useful information in predicting seal life or comparing economic alternatives.

Another difference in elastomer compounds is the compounding (or mixing) of ingredients. These factors can provide unique pigmentation, improved specific chemical or thermal properties, improved dynamic performance, reduced cost, improved electrical properties, reduced friction or sticking, and many other aspects of seal performance.

elastomer selection for o-rings and seals

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