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If substances are in temporary storage with a view to re-exportation and remain under customs supervision, they are not subject to REACH.
To rely on this exemption, you need to document that the following conditions are fulfilled:
- The substances are put in a free zone or free warehouse as defined under customs legislation or placed under another relevant customs procedure (transit procedure, temporary storage).
- The substances are kept under the supervision of the customs authorities.
- The substances do not undergo any form of treatment or processing during their stay in the EU. A free zone or a free warehouse in the EU territory is part of the EU.
For further information see chapter 18.104.22.168 "Substances under customs supervision" in the Guidance on registration: