Recently, the Yunnan Provincial Market Supervision Bureau issued a circular on the spot check of the quality supervision of five kinds of products such as cement in Yunnan Province in 2025.
This supervision spot check involves general Portland cement, masonry cement, phosphorus slag Portland cement and other varieties, and the main inspection items include: sulfur trioxide, magnesium oxide, loss on ignition, insoluble matter, chloride ion, setting time, soundness, strength, water retention rate, fineness, water-soluble chromium (VI) and radioactivity in cement. 132 batches of products were sampled from 119 production enterprises in 16 prefectures (cities) of the province, and 2 batches were found to be unqualified. The unqualified items involved were chloride ions.
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