The European Chemicals Agency says that if your substance is already registered, a substance information exchange forum (SIEF) exists. Contact the lead registrant of the SIEF – you might have already received emails from that company. You can also check who the lead registrant is in the pre-SIEF pages of REACH-IT. The lead registrant will put you in contact with the SIEF. You may also ask any of the companies that have registered your substance how to best get in contact with the SIEF. You can find out who these companies are on ECHA’s website.
ECHA enews, 18 November 2015 ;http://echa.europa.eu ;