S 14%, Si 11.8%, EtO 58%
Patent and stability
US patent applications (2007) 40-50
The disulfide is also in wide spread use. Mostly likely initially it became part of the way around the patent of Michelin. Because it has less sulfur it can be processed under slightly more extreme conditions. It can be made under similar conditions to TESPT so is readily available and competes on an economic basis. For both of the bifunctional silanes the sulfurs are actually have a range of oligomers which are included in the specs of the materials. For this material the nominal spec is 75% of the S2 oligomer. We have this available as SCA 985 in the various product forms.
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