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Silicone Formulators Discard Organotins

Andy Extance – Jun 29, 2011

Dibutyltin dilaurate (DBTL) has long been widely exploited in room temperature vulcanizable one-part (RTV-1) and two-part (RTV-2) silicone adhesives and sealants, as well as polyurethanes. More recently, however, dibutyltin and dioctyltin compounds have come to be considered as Carcinogenic, Mutagenic or Toxic to Reproduction (CMR) category 2. From January 1 2012 products for supply to the general public will not be able to contain dibutyltin compounds above levels equivalent to more than 0.1 per cent of tin by weight. RTV-1 and RTV-2 silicones have a reprieve until January 1 2015, but already companies have developed catalysts that completely avoid tin.

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