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Taiwan Updates Existing Chemical Substance Inventory for Phase 1 Existing Chemical Registration

Updated on 9 Sep 2015, Taiwan Existing Chemical Substance Inventory (TCSI) is now available on CSNN website (, covering over 100,000 existing substances.

This update is based on EPA’s supplementation program which ended on 31 Mar 2015. The TCSI should have been updated before 1 Sep 2015, the date when the Phase 1 existing chemical substance registration scheme kicked in (See ChemLinked news). However, Taiwan MoL failed to meet this deadline due to delays in transferring data from EPA to MoL in addition to further internal review work.

At present, the online inventory is the only method available to determine a chemical’s status. It is not always easy to determine if a chemical is existing/new by simply checking the national inventory. For instance, a large number of substances have been designated confidential through the previous Existing Chemical Substance Nomination (ECN), Supplementary Existing Chemical Substance Nomination (SECN) and Second SECN (SSECN) held by MoL, as well as the EPA’s supplementation program. However, Taiwan’s authority will not provide any other inquiry services to identify whether a substance is new or not (see ChemLinked news), meaning the online search result is the only method to determine whether you need to do existing chemical registration or new chemical registration.

MoL has deliberated with EPA for quite a while on the feasibility of issuing an editable version of the whole inventory to facilitate offline searching however at present the authority has no plans to issue such an inventory.

The most recent update has seen significant breakthrough in search functionality. In addition to the “quick search” and “advanced search” for a single substance, a new function called “multiple search” is available now. 5 substances can be checked at one time by inputting their CAS No./Serial No., or chemical name in English/Chinese. 

Despite these improvements it is still a challenge for potential registrants to identify all the substances of their concern, especially for those with thousands of substances to check. What’s worse, due to political factors, nearly all Taiwan websites are blocked in Chinese mainland, which means enterprises in Chinese mainland cannot freely surf the CSNN website.

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