HPMC (Hydroxypropyl Methyl Cellulose) is commonly used as an additive in cement-based plaster and mortar. Here are some of the ways HPMC can improve the properties of cement-based plaster/mortar: Water retention: HPMC can absorb and retain water, which can help to improve the workability and setting time of cement-based plaster/mortar. This is because the water retention properties of...