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Walk into any dry mix mortar formulation discussion and the same question comes up repeatedly: should this product use HPMC, HEC, or HEMC? All three are cellulose ethers, all three provide water retention and thickening, and all three are sold by suppliers claiming their grade is the best fit. For dry mortar manufacturers and construction chemical formulators across Southeast Asia, Europe, and Asia, choosing the wrong cellulose ether means reformulation, wasted trial batches, and finished products that underperform in the field. This article explains the real chemical differences between Hydroxypropyl Methyl Cellulose, Hydroxyethyl Cellulose, and Hydroxyethyl Methyl Cellulose, and which one fits which application.