Talking about Hydroxypropyl Methyl Cellulose Ether (HPMC) for Dry Powder Mortar(3)
The higher the viscosity, the more obvious the thickening effect of the mortar, but it is not proportional. The higher the viscosity. The more sticky the wet mortar will be. During construction. It will stick to the scraper and have high adhesion to the substrate. But it does little to increase the structural strength of