Turkey’s equivalent to the EU’s REACH regulation, the KKDIK, entered into force late 2017. The pre-registration deadline under KKDIK was 31 December 2020, and the registration deadline is set for December 31, 2023, without consideration to the tonnage band. Companies that missed the pre-registration deadline for substances already on the Turkish market were required to stop manufacturing or importing those substances beginning January 1, 2021. A late pre-registration is still allowed until 31 December 2023 for substances manufactured in Turkey, or imported into the country for the first time by a company, at one metric ton or more. More than 22,000 substances have been pre-registered. See here and the ICTA substance regulation overview here.