On June 20, 2022, the European Chemicals Administration (ECHA) proposed to add hydrogenated triphenyls (CAS No. 61788-32-7) to the list of restricted substances in Annex XVII of the EU REACH Regulation (EC) no 1907 / 2006 for restriction, and carried out public consultation. In addition to exemptions, it is proposed to prohibit the placing on the market of hydrogenated triphenyls, and prohibit the placing on the market of substances, mixtures and articles with a concentration of hydrogenated triphenyls equal to or more than 0.1% (by weight).

Main uses of hydrogenated triphenyl

Hydrogenated triphenyl is a kind of heat transfer oil with excellent performance. Its main component is a mixture of partially hydrogenated triphenyl isomers, which is partially hydrogenated from the mixtures of O, m and p-triphenyl in different proportions (saturation: 39%).

Hydrogenated triphenyl has excellent thermal stability, oxidation resistance and low vapor pressure. It is widely used in petrochemical, synthetic fiber, synthetic resin, medicine, printing and dyeing industries, high-temperature heat conduction, heating equipment systems, chemical fiber polymerization (polyester, nylon polymerization, dry polyurethane spinning), silicone monomer synthesis, trichlorosilane and polysilicon, pharmaceuticals, pesticides, dye intermediates and other fine chemicals and biodiesel. This substance is classified as very persistent and very bioaccumulative substance (vpvb) and is included in the list of substances of high concern (SVHC) (list of candidate substances for authorization).

Proposed restrictions:

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The public consultation on this restriction began on June 20, 2022 and will end on December 20, 2022. The final opinions of the risk assessment committee (RAC) and the social and economic assessment committee (SEAC) will be released before the end of July 2023. ECHA will submit the joint opinions of the two committees to the European Commission, which will finally decide whether to add the proposed restricted items to the list of restricted substances in Annex XVII of reach regulation.

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