This article discusses reversion in sulfur-cured rubber: a loss of effective crosslink structure during excessive heat exposure. It can affect the properties of a molded part. Reversion does not mean that the part returns to its original, usable uncured state.
Why cure control matters
Crosslink formation and network changes can occur during curing. With some sulfur-cured compounds, prolonged heating can reduce properties after the useful cure stage. The response depends on the formulation and cure conditions; not all rubbers follow the same pattern.
Prevention and verification
Use the specified cure cycle, monitor equipment conditions and evaluate relevant compound and part tests. Changes in hardness, strength or deformation behavior should be investigated before a production batch is accepted.
Other elastomer systems can also undergo thermal network degradation. A non-sulfur cure system is not a guarantee against heat damage. Select and validate the compound for both the molding process and the intended service conditions.
