Low tensile bond strength in tile adhesive is one of the most common challenges formulators face. Adjusting cement content, changing aggregate gradation, or increasing polymer dosage often brings limited improvement. The hidden variable may be the combination of HPMC viscosity and dosage. These two factors do not act independently. They interact. An orthogonal experiment is
Under relentless cost pressure, a tempting logic often takes hold: cellulose ether controls workability, so adding more should make it better. It boosts water retention, and the extra cost seems small. This reasoning sounds plausible, but it hides a trap. The relationship between cellulose ether dosage and workability is not a straight line pointing upward.
“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
