Description of content: The draft Circular introduces Amendment 1:2026 to three existing national technical regulations: QCVN 03A:2020/BCT (Industrial sodium hydroxide), QCVN 06A:2020/BCT (PAC), and QCVN 07A:2020/BCT (Industrial ammonia). The draft amendments mainly include: • Amendments and updates to requirements on labeling and transportation based on new Decree. • Updating conformity declaration and assessment procedures based on amended Law on Product and Goods Quality (78/2025/QH15) These draft amendments apply to: 1. Organizations and individuals manufacturing, importing, trading in, and using industrial sodium hydroxide, PAC, and industrial ammonia; 2. Conformity assessment organizations conducting conformity assessment activities for these products; 3. State management agencies and other relevant organizations and individuals