Viton B-435C fluoroelastomer Dupont Dow Elastomers Fluoropolymers SEALANT ADHESIVE In adhesives applications, Viton forms a strong bond that can flex without failure after repeated temperature cycling and vibration. Terpolymer of hexafluoropropylene, vinylidene fluoride and tetrafluoroethylene, plus cure chemicals Viton B-435C is precompound intended for use in moulding applications which require bonding to metal inserts. This pre-compound contains a new proprietary cure system, bonding promoter and process aid package which has been developed to impart improved processing characteristics over existing ter-polymer pre-compounds. It is designed to provide a wide processing window combined with easy mould release and low mould fouling. Typical applications for this new material are valve stem, cam shaft and crank shaft seals, as well as other metal bonded components requiring the heat and fluid resistance of a 68,5% fluorine Viton ter-polymer. Some of the advantages which can be realized by using this new material are: Calcium hydroxide is not required during final compounding, although if added it will increase cure rate as with other bisphenol-cured Viton types. The many problems related to calcium hydroxide (e.g. hygroscopy and dispersion) can be totally eliminated. Safe, scorch free moulding when processed at traditional mould temperatures (e.g. 190° C). This can help to reduce/eliminate scorch related rejects in cases where flow paths are relatively long and tortuous. Fast cure cycles and hence improved productivity when processed at higher mould temperatures would be possible using pre-compounds (e.g. >200° C). without the risk of mould fouling. Since Viton is less fragile at lower crosslink densities this can result in fewer rejects (e.g. spring groove tearing in the case of shaft seal or valve stem seal production). This new pre-compound has been designed to provide more efficient, cost effective processing. Shorter cycle times, reduced rejects and longer periods between mould cleaning all contribute to effectively lowering the cost per part. Apart from reducing the cost per part, improved productivity may have far more important implications. An example might be elimination of the need for capital investment for additional injection moulding machines. Terpolymer of hexafluoropropylene, vinylidene fluoride, and tetrafluoroethylene, plus cure chemicals. Contains a cure system, bonding promoter and process aid package which has been developed to impart improved processing characteristics. Used in moulding applications which require bonding to metal inserts. Forms a strong bond that can flex without failure after repeated temperature cycling and vibration in adhesives applications.