• • Blog
• March 30th 2026

What are the methods for dissolving hydroxypropyl methylcellulose (HPMC)?

Answer: Hot water dissolution method: Since HPMC does not dissolve in hot water, it initially disperses evenly in the hot water, then dissolves rapidly upon cooling. Two typical methods are described below:

1) Add 1/3 or 2/3 of the required amount of water to a container and heat to 70°C. Disperse HPMC as in method 1) to prepare a hot water slurry. Then add the remaining cold water to the hot water slurry, stir, and cool the mixture.

Powder mixing method: Mix HPMC powder with a large amount of other powdered materials thoroughly using a mixer. Then add water to dissolve. HPMC will dissolve without clumping because each tiny corner contains only a small amount of HPMC powder, which dissolves immediately upon contact with water. This is the method used by putty powder and mortar manufacturers. [Hydroxypropyl methylcellulose (HPMC) is used as a thickener and water-retaining agent in putty powder and mortar.]

2) Place the required amount of hot water in a container and heat to approximately 70°C. Hydroxypropyl methylcellulose (HPMC) was gradually added with slow stirring. Initially, HPMC floated on the surface of the water and then gradually formed a slurry. The slurry was then cooled with stirring.

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