Cohedur® A 250

Cohedur® A 250 by Rhein Chemie Additives (Lanxess Group) is an adhesion promoter additive. It can directly bond rubber with commonly used fabrics, textile fibers, such as rayon, polyamide and polyester (with special spin finish) and brass- or zinc-plated steel cord. It improves the adhesion substantially when used with polymers having a higher degree of saturation like EPDM. It is created by providing the rubber component with a resorcinol-, methylene- and reinforcing silica component. It is processed by vulcanization. It finds application in diene rubbers such as NR, SBR, BR, NBR and CR. Recommended dosage level based on 100 parts by weight of elastomer are 4.6 phr in Cohedur® A 250 3.4 phr in Cohedur® RS and 15 phr in Vulkasil® S. It has a shelf life of 2 years.