Fluoroelastomer Specialists
As noted by Rubber World in their article, “Achieving Savings in the Post-Curing Process of Fluoroelastomer Compounds Prepared by Injection Molding,” rubber compounds based on FKM elastomers undergo a two-stage curing process to optimize physical and mechanical properties, such as compression set and tensile strength. The primary curing occurs under pressure during injection molding, while the secondary post-cure phase takes place in an oven, completing crosslinking reactions that enhance stability.
During post-cure, FKM compounds benefit from conditions that optimize performance and cost. This stage volatilizes process aids, like carnauba wax, and ensures stable product quality. However, to avoid adverse reactions, FKM parts should not be cured alongside components made from other elastomers, particularly silicone rubber, which can be damaged due to chemical interactions in the oven environment.
Temperature and time settings for post-curing vary, commonly ranging from 150°C to 250°C, though 200-232°C is typical for FKM compounds. Factors such as the compound’s formulation and cure system type (bisphenol or peroxide) influence the ideal post-cure duration, which may last between 2 to 24 hours depending on the required specifications.
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Article with all rights reserved, courtesy of Rubber World.
