When the revised Toxic Chemical substances Control Act (TCSCA) comes into force, chemicals manufactured or imported to the Taiwanese market before 11 Dec 2014 will be eligible for inclusion into The Taiwan Existing Chemical Substance Inventory (Taiwan ECSI) as existing chemical substances. Companies must provide proof of these substances previous manufacture or import before 31 Mar 2015, as specified in the Article 16 of the Regulation on Registration of New and Existing Chemical Substances under TCSCA.