The Taiwan region of China’s Ministry of Environment released hazard assessment templates for four Priority Existing Chemicals (PEC) substances on August 5, 2025. These substances are zinc oxide (CAS No. 1314-13-2), sulfuric acid (CAS No. 7664-93-9), toluene (CAS No. 108-88-3), and antimony trioxide (CAS No. 1309-64-4). Throughout the region, these PEC chemicals are commonly used. Regulations state that businesses that have applied for Standard Registration Levels 2 through 4 for the four PEC substances mentioned above and received Standard Registration Completion Codes must provide the appropriate authority with information about Hazard and Exposure Assessment for PEC substances by December 31, 2026.

Regarding Hazard Assessment Information: The Taiwan region’s competent authority has made hazard assessment report templates available for the four PEC chemicals in order to help businesses achieve registration compliance. Businesses can obtain reference materials from the Ministry’s official website’s download area. Registrants do not need to submit this information again if they approve and use the hazard assessment report templates. Registrants who choose to independently prepare and submit hazard assessment information because they disagree with the templates’ content must first complete a confirmation survey by December 31, 2025, and then submit their own self-prepared hazard assessment reports by December 31, 2026.

About Exposure Assessment Information: Prior to the deadline, all businesses must update or add to the original registration information pertaining to exposure assessment items (i.e., Section 2: Substance Manufacture, Uses, and Exposure Information). Companies involved in manufacturing, formulation, or usage activities, whether ongoing or planned, must concurrently submit information about exposure scenarios (e.g., Annex 4 Item 2.1 of the Registration Measures, or Section 9.1 Exposure Scenario Description in registration tools). The notice states that additional exposure assessment data, such as risk categorization and exposure amount estimation, are now not needed.

The relevant registrants will then get formal letters from the appropriate authority directing them to provide information about their exposure and hazard assessments. Additionally, it will schedule informative sessions and use the system to inform pertinent registrants of submission deadlines. According to the authority responsible, the goal of this effort is to improve the management of chemical substances. To prevent fines for past-due filings, pertinent businesses should take note of the deadline and follow it. The Ministry of Environment’s Chemical Substances Management Agency has comprehensive notifications and hazard assessment forms available.

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