Usually, according to whether it could be dissolved in cold water or not, we divide HPMC into two types: surface treated HPMC and non-surface treated HPMC, and today, let’s introduce the surface treated HPMC first.
What is its other name
Beside surface-treated HPMC, it is also called delayed solubility hydration HPMC, instant soluble HPMC.
How is it made
We use a cross-linking agent (usually use glyoxal) to treat its surface in the production process, so the surface treated HPMC could disperse in cold water quickly, while not dissolve at first. And due to this extra process, it is a little expensive than the non-surface treated HPMC.
What is its strength
As it could be dissolved in cold water directly not like non-surface treated HPMC which has to be dissolved in hot water, surface treated HPMC could be used in more application areas, like glue and coating, detergent. And we could control the time of the HPMC becoming viscous by control the PH value of the solution, as you know, if you want to get it viscous slowly, then make an acidic environment of the solution.
