1. The name is different.
Surface treated HPMC, HEMC is also called delayed solubility/hydration HPMC, instant soluble HPMC, HEMC.
Non-surface treated HPMC, HEMC is also called slowly soluble HPMC, HEMC, hot water soluble HPMC, HEMC.
2. The production process is a little different
Actually, the Surface treated HPMC, HEMC has one more procedure than the non-surface treated HPMC, HEMC in the production process, and it’s adding a cross-linking agent to treat the surface of HPMC, HEMC, so that the HPMC, HEMC can be dispersed in cold water quickly.
3. The price is different
Because of the extra procedure in the production process, usually, the surface-treated HPMC, HEMC is a little expensive than the non-surface treated HPMC, HEMC.
4. Different ways of dissolution
Surface treated HPMC, HEMC:
We can just add it in the cold water gradually and keep stirring for about 30 minutes, because the HPMC, HEMC is just dispersed in the water at first, so it takes some time to build up the viscosity until it’s totally dissolved in water.
Non-surface treated HPMC, HEMC:
Because it will agglomerate when it’s put into cold water, but disperse in hot water, so we generally put it into hot water first, then make or wait for the temperature to cool down, and the trasparent viscous liquid is formed.
5. The application is a little different
Because the surface treated HPMC, HEMC could be dissolved in cold water directly, it has a wider application area, it could not only be applied in wall putty, cement-based mortar, tile adhesive, but also could be used in glue and coating, detergent, and so on, so surface-treated HPMC, HEMC has a wider application.