Taiwan Existing Chemical Substances Inventory (ECSI) will be updated based on the Second Supplementary Existing Chemical Substance Nomination (SSECN) before the implementation of the revised Taiwan TCSCA on 11 Dec 2014. The final version of ECSI will serve as the basis for judging whether a substance is new and subject to new chemical registration under the revised TCSCA. The finished ECSI will be appended thereafter through inclusion procedures for registered new chemical substances.