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Working with High Consistency Rubbers

A high consistency rubber, or HCR, consists of a high molecular weight polymer combined with reinforcing filler to produce a material that can be molded, extruded, or calendered into a useful end product. An HCR has the consistency of clay when uncured and is primarily formulated in a one- or two-part system (peroxide and platinum catalysts respectively). Known for high mechanical strength, HCRs are also sometimes referred to as high tear rubbers or high tear elastomers (HTRs or HTEs). This application note will cover potential applications for HCRs, typical properties, cure chemistries, and processing HCRs.