The listing of 15 substances as chemicals of concern will trigger further regulatory actions under Taiwan TCCSCA. On January 12, 2023, Taiwan EPA listed these 15 chemical substances as concerned chemical substances. Their production, import, sale, use, and storage are now subject to tightened regulations under Taiwan TCCSCA. Online sales of these substances are prohibited immediately. However, transitional periods have been granted for complying with new requirements, including pre-approval prior to manufacturing, import, sales, use or storage, handling quantity recording and reporting, accident prevention and emergency response, labeling, and SDS requirements, etc. For example, existing handlers shall obtain the approval before February 1, 2024. The 15 chemical substances include: CAS number Chemical name 110-63-4 1,4- Butanediol 475-81-0 (S)-5,6,6a,7-tetrahydro1,2,9,10-tetramethoxy-6-methyl4Hdibenzo[de,g]quinoline 1317-36-8 Lead monoxide 1314-41-6 Lead tetroxide 1313-82-2 Sodium sulfide 540-72-7 Sodium thiocyanate 135-19-3 β-Naphthol 10124-37-5 Calcium nitrate 7631-99-4 Sodium nitrate 15245-12-2 Calcium ammonium 75-52-5 Nitromethane 26628-22-8 Sodium azide 7790-98-9 Ammonium perchlorate 7601-89-0…