With a view to enhancing the quality of cements, the Bureau of Standards, Metrology and Inspection (BSMI) proposes to adopt the updated version of CNS 61, Portland cements, published in 2025, as the inspection standard. The main change of CNS 61 is that the maximum limit for chloride ion content in type I/IA Portland cement is revised from 240 ppm to 350 ppm, and the requirement of chloride ion content is modified from an optional chemical composition provision to a mandatory chemical composition standard requirement (i.e., reclassified as a CNS 61 quality item). The conformity assessment procedures remain the same, i.e., Monitoring Inspection (MI) or Monitoring Inspection of Products from Premises with Registered Management System (MS-Based Monitoring Inspection).