Room-temperature-vulcanizing (RTV) elastic silicone usually employs organic tin compounds as a hardener. It is well known that they are strong biohazards. Thus, the European Union plans to regulate the use of organic tin compounds and to exclude them from industrial products until 2015. The authors have succeeded in making a substitute for organic tin compounds as a hardener for RTV elastic silicone by using titanium alkoxide and a carboxylate ester as the hardener and promoter, respectively. In this paper, composites of RTV elastic silicone made with silica particles and a silane coupling agent are studied based on the mechanical, heat-resistive, and adhesive properties.
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