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Vinyl

Most products of this type have the vinyl group closely attached to the silicon atom. They are mainly used in systems that are cured by a free-radical process such as peroxide in which the vinyl unsaturation can participate.

Methacryl

This is still mainly intended for peroxide cross-linking but is a more reactive group than vinyl, and the unsaturation is also generally further away from the silicon atom.

Epoxy

Commercial products are based on 3-glycidoxy propyl trimethoxy silane. Although they can perform well in a number of systems, they are relatively expensive and mainly restricted to use in epoxies for which they are more suitable than other silane types.

Amino

Amino functional silanes are fairly widely used. The commercial ones are usually based on the y-aminopropyl functionality. They are very versatile and are used in epoxies, phenolics, urethanes, polyamides, and some elastomers. They can also be used in conjunction with acid functional polymers and in some polyolefins. In this case, they react with the acid functionality to form an amide linkage.

 
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