HPMC Quality: 4-Step Quick Test
Hydroxypropyl methyl cellulose (HPMC) is the soul of dry‑mix mortar. Its quality directly determines water retention, strength, and application feel. Yet, the market is full of products with inconsistent quality. Adulteration, low degree of substitution, and high ash content are all too common. Instead of relying solely on supplier reports, it is far better to
