Yes, Hydroxyethyl Methyl Cellulose (HEMC) is commonly used as a performance additive in gypsum plaster formulations. Gypsum plaster, also known as plaster of Paris, is a widely used building material for interior wall finishes and decorative applications. HEMC serves several important functions in gypsum plaster formulations:

1. Water Retention: HEMC helps retain water in the gypsum plaster mix, ensuring proper hydration of the gypsum particles and prolonging the workability of the plaster. This allows for easier application and smoother finishes.
2. Improved Workability: By increasing the workability and plasticity of the gypsum plaster mix, HEMC facilitates easier spreading, troweling, and finishing of the plaster. This results in a more uniform and aesthetically pleasing surface.
3. Reduced Sagging and Shrinkage: HEMC enhances the cohesiveness and thixotropic properties of gypsum plaster, reducing the risk of sagging or slumping during application and minimizing shrinkage cracks as the plaster dries.
4. Enhanced Adhesion: HEMC promotes better adhesion of gypsum plaster to various substrates, including masonry, concrete, drywall, and existing plaster surfaces. This improves the overall bond strength and durability of the plaster finish.
5. Controlled Setting Time: HEMC can help regulate the setting time of gypsum plaster, allowing for adjustments to suit specific application requirements and environmental conditions. This ensures optimal working time and allows for proper curing of the plaster.
6. Improved Mechanical Properties: Incorporating HEMC into gypsum plaster formulations can enhance the mechanical properties of the hardened plaster, including compressive strength, flexural strength, and impact resistance.
7. Reduced Dusting and Crumbling: HEMC helps minimize dusting and crumbling of gypsum plaster surfaces by imparting greater cohesiveness and durability to the plaster matrix. This results in a smoother and more durable finish that is less prone to damage.

HEMC serves as a valuable performance additive in gypsum plaster formulations, providing benefits such as improved workability, water retention, adhesion, and durability. Its use contributes to the production of high-quality plaster finishes with enhanced properties and performance characteristics.