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Opinion on an Application for Authorisation for chromium trioxide, potassium dichromate, sodium dichromate use: Industrial use of a mixture containing hexavalent chromium compounds for the conversion of cadmium coated circular and rectangular connectors in order to achieve a higher level of performances than the requirements of international standards as well as to withstand harsh environments and high safety applications (such as in the military, aeronautic, aerospace, mining, offshore and nuclear industries or for the application in safety devices for road vehicles, rolling stock and vessels)

The Committee for Risk Assessment (RAC) and the Committee for Socio-economic Analysis (SEAC) evaluated the proposal for authorisation submitted by Souriau sas, in line with REACH Regulation. The opinion concerns the applicant’s use of chromium trioxide, sodium and potassium dichromate in mixtures for the conversion of cadmium coated circular and rectangular connectors. RAC assessed the risk of carcinogenicity in exposed workers and general population exposed via the environment, taking into account the appropriateness and effectiveness of the risk management measures as described in the application and the risks arising from potential alternatives. RAC confirmed that it is not possible to determine a DNEL for the carcinogenic properties of the substances in accordance with Annex I of the REACH Regulation, that there appear not to be any suitable alternatives that further reduce the risk, and that the operational conditions and risk management measures described in the application limit the risk, provided that they are adhered to along with the suggested monitoring arrangements. SEAC assessed the socio-economic factors and the availability, suitability and technical and economic feasibility of alternatives associated with the use of chromium trioxide as described in the application. SEAC confirmed that there appear not to be suitable alternatives in terms of their technical and economic feasibility for the applicant, and did not raise any reservations that would change the validity of the applicant’s conclusion that overall benefits of the use outweigh the risk to human health, whilst taking account of any uncertainties in the assessment, provided that the suggested conditions and monitoring arrangements are adhered to. The duration of the review period for the use is recommended to be 12 years.

risk assessment, REACH, authorisation, chromium trioxide, sodium dichromate, potassium dichromate, conversion of cadmium coating, carcinogenicity, occupational exposure, general population

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