Bonding of Solid Rubber HTV

The bonding of HTV to various substrates works analogously to the bonding of LR. HTV has much lower curing speeds at any given temperature and this enables it to be used in many different applications, which for the most part are described in Sectionll.4. 

In the case of two-component composites such deflashing steps may become critical, if the components have different coefficients of thermal expansion and becanse of a strong increase of brittleness in case of thermoplastic substrates. 

In most cases HTV rubbers are bonded to solid substrates using undercuts or primers. Self-adhesive HTV rubbers work in the same way as their LR counterparts. However, moulding is more critical because of substantially longer curing times which can lead to demoulding problems, as mould stickiness increases dramatically with curing time. For such purposes the processor might need to prime his moulds with a special PTFE primer. It should be noted that self-adhesive HTV sticks to steel when moulded  

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