Substance Information Exchange Fora (SIEF)

Substance Information Exchange Fora (SIEF)

Substance Information Exchange Fora (SIEF)

What is a SIEF?

Under REACH, a SIEF is formed for each pre-registered substance with the same identity.  SIEF participants are either potential registrants or data holders. A SIEF has no prescribed legal form, but is a forum to share data, facilitate the registration process and agree on classification and labelling (C&L) of the substance. Participants in a SIEF are free to organise themselves as they see fit (e.g. in a consortium or other form of co-operation) to carry out their individual REACH obligations. All SIEFs shall remain operational until 1 June 2018.

A SIEF is only formed when pre-registrants have agreed that they manufacture or import the same substance. They will share and assess data and prepare common parts of the registration (joint submission).

IMPORTANT: ENSURE THAT YOUR CONTACT DETAILS IN REACH-IT ARE UPDATED AND ACCURATE AS SIEF COMMUNICATIONS WILL USE THIS INFORMATION.

What must I do?

All SIEF participants shall:

  • Request missing information from other participants;
  • React to requests for information from other participants;
  • Provide other participants with existing studies upon request;
  • Collectively identify needs for further studies to comply with registration requirements;
  • Make arrangements to perform any identified studies;
  • Agree on classification and labelling of the substance.
  • Nominate a Lead Registrant for the joint submission process (OSOR). 


Third-party data holders in the SIEF who do not intend to submit a registration:

  • Must respond to a query from potential registrants if they hold related data;
  • Are not entitled to request data.


During March-June 2009, two internet-based survey forms were sent to each pre-registrant of Mn-based substances to the email address in the ECHA REACH-IT system. These surveys included:

  • substance identity sameness agreement, 
  • SIEF formation, 
  • lead registrant nomination,
  • a request for data holders to come forward and
  • SIEF participant's registration intention


The SFF dialogue box in REACH-IT, where available, includes some results from these surveys.


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