The cellulose ether market is full of inconsistent quality. Some low‑cost "blended ethers" are nothing more than pure cellulose ether mixed with cheap fillers. Common adulterants include CMC, starch ether, bentonite, and talc. They may feel acceptable during application, but their water retention, bond strength, and aging resistance are severely compromised. A test report can
“Costs are too high – maybe we should add more cellulose ether?” This is a common thought when formulators face budget pressure. Cellulose ether is expensive, but polymer powders cost even more – so using extra HPMC to “compensate” for workability seems like a reasonable low‑cost strategy. Unfortunately, that path often leads to more problems
Carboxymethyl cellulose (CMC) was once widely used in low‑end construction mortars due to its low price. However, as quality requirements rise, its performance weaknesses are becoming more and more obvious. That said, this does not mean CMC must be abandoned entirely. Understanding its limitations — and either replacing it where needed or using it cleverly
Different effects of HPMC, starch ether and RDP on gypsum mortar Hydroxypropyl methylcellulose (HPMC) 1. It is stable to acids and alkalis, and its aqueous solution is very stable in the range of pH=2~12. Caustic soda and lime water do not have much impact on its performance. But alkali can speed up its dissolution. And
