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In premixed mortar, only a little HPMC can significantly improve the performance of wet mortar, which shows that HPMC is a major additive affecting the construction performance of mortar.
Selection of different varieties,

All types HPMC can be directly added in the material as dry mixing method

HPMC is off-white powder in appearance. HPMC could dissolved in water and forms colloids. It is no-toxic.

What is it: HPMC is a chemically modified cellulose polymer that is off-white in color and considered safe for human consumption. It is most commonly used as an alternative to gelatin and gluten in vegan-friendly products.

In the production of building materials, especially dry mixed mortar, cellulose ether plays an irreplaceable role, especially in the production of special mortar (modified mortar), is an indispensable and important part.

Soluble in water and most polar organic solvents and appropriate ratio of ethanol/water, propanol/water, dichloroethane, etc. Insoluble in ether, acetone, anhydrous ethanol. Dissolves in cold water into a clear or slightly turbid colloidal solution.

HPMC is widely used in building materials, coatings, synthetic resins, ceramics, medicine, food, textile, agriculture, cosmetics, tobacco and other industries. HPMC can be divided into: construction grade, food grade and pharmaceutical grade according to the application.

Generally the viscosity is proportional to the water retention viscosity under 100,000.but viscosity more than 100,000 water retention rate basically does not increase.so not viscosity more quality better.

It depends on your usage

In the mortar why people on water retention requirements are so high, water retention good mortar has what outstanding advantages, let me introduce to you, the importance of mortar water retention.