Curing additive
In addition to RTV and liquid vulcanization systems, silicone rubber is typically vulcanized using peroxides such as benzoyl peroxide, 2,4-dichlorobenzoyl, tert butyl perbenzoate, and diisopropylbenzene peroxide. Alkyl hydroperoxides and dialkyl peroxides have also been successfully used in silicones containing vinyl groups.

Silicon hydride addition or silicon hydride addition is an alternative curing method for vinyl containing siloxanes, utilizing silane materials and platinum containing compounds as catalysts. This is a two-part process that requires mixing two different ingredients, and the shelf life of the resulting material is limited. Curing does not produce volatile compounds, and traditional thermosetting silicone resins with high tear strength can be cured in this way.
filler
Adding reinforcing fillers is to improve the poor tensile strength of silicone resin in other aspects. Despite the use of carbon black, silica in the form of silica fume with particle sizes ranging from 10-40 nanometers is the most preferred filler. The filler does indeed interact with the vulcanized rubber, forming pseudo vulcanization. This may occur during the mixing process (creep hardening) or during storage (silo aging).
Although grinding can destroy these structures, structural control additives or ant structure additives are usually added to counteract these reactions. Examples of these materials are based on siloxanes, such as diphenylsilane and quinoxaline.
Other additives
Compared with natural rubber, silicone resin has better fire resistance. This performance can be improved by adding flame retardant additives such as platinum compounds, carbon black, aluminum trihydrate, zinc or cerium compounds. It should be noted that the addition of carbon black also increases conductivity. Iron oxide, titanium dioxide, and other organic metal compounds can also be added as pigments to improve thermal stability.
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