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An impurity in a polymer is defined as an unintended constituent present in the manufactured polymer substance. It may originate from the starting materials, such as the monomers or any other reactants, or be the result of secondary or incomplete reactions during the production process. While it is present in the final substance it was not intentionally added. Examples of impurities in a polymer include unreacted monomers or other reactants, residual polymerisation catalyst, or any contaminant from the manufacturing process. The definition and detailed guidance on how to handle impurities can be found in Section 4.2.- 'Substances of well defined composition', Section 4.3.- 'UVCB substances', and Chapter 5- 'Criteria for checking if substances are the same' of the Guidance for identification and naming of substances Under REACH and CLP: http://echa.europa.eu/guidance-documents/guidance-on-reach
The provisions under the REACH Regulation with regard to information in the supply chain (Title IV), authorisation (Title VII), restrictions (Title VIII) and classification and labelling C&L (Title XI) may also apply to polymers. Further information on this issue is provided in Section 3.2.2- 'Application for authorisation', Section 3.2.3- 'Compliance with restrictions', 3.2.4- 'Classification and labelling', and Section 3.2.5- 'Information down the supply chain' of the Guidance for monomers and polymers: http://echa.europa.eu/guidance-documents/guidance-on-reach.