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Impact assessment of potential restrictions on the marketing and use of certain organotin compounds
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Impact assessment of potential restrictions on the marketing and use of certain organotin compounds

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Organotin compounds (organotins) are substances composed of tin, directly bound to a number of organic groups. They are characterised by the presence of a strong carbon-tin bond and have the general formula: Rx Sn L(4-x), where R denotes an organic alkyl or aryl group and L denotes one or more organic (or sometimes inorganic) ligands, which may or may not be the same. In general, the properties of organotin compounds vary significantly, depending upon their structure. Thus, while the carbon-tin bond is strong, the association with the ligands is less so and has a tendency to undergo dissociation both in use and in the environment (RPA, 2005). Organotins are not included in the list of priority substances under the Existing Substances Regulation (ESR) (Council Regulation (EEC) No. 793/93). However, due to concerns over potential risks from organotins, the European Commission (DG Enterprise and Industry) undertook a detailed assessment of these risks - which culminated in the September 2005 Risk Assessment Report (RAR) which identified specific unacceptable risks. Following a SCHER opinion on the RAR, the European Commission (DG Enterprise and Industry) commissioned this study to assess the potential impacts of restrictions on the marketing and use of certain organotin compounds used as PVC stabilisers or catalysts in the production of consumer articles. It should be noted that restrictions have already been introduced at the EU level on certain antifouling applications of organotins by means of amendments to the Marketing and Use Directive (76/769/EEC) (also known as the Limitations Directive). Regulation (EC) No (782/2003) of the European Parliament and the Council also prohibits the use, as from 1 July 2003, of organotin compounds as biocides in anti-fouling systems on EU ships and, as from 1 January 2008, on any ship entering EU waters.
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