1. Hydroxypropyl methyl cellulose HPMC has stable chemical properties, mildew-proof and water-retaining effects in the glue, and is not affected by changes in PH value. The viscosity can be used from 100,000 S to 200,000 S. However, in production, the higher the viscosity, the better. The viscosity is inversely proportional to the bonding strength. The …
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