The Application of HPMC in Heavy Gypsum
Hydroxypropyl Methylcellulose (HPMC) is a vital additive in construction materials, especially in heavy gypsum systems, where strength and workability are key. In this article, we will explore:
What Is Heavy Gypsum?
Heavy gypsum is a modified gypsum-based building material with higher density and improved mechanical strength. It’s commonly used for:
- Interior leveling
- Prefabricated gypsum blocks
- High-strength wall panels
- Acoustic and fire-resistant systems
Why Add HPMC to Heavy Gypsum?
HPMC helps to:
- Improve water retention, preventing cracks
- Enhance workability and smoothness
- Extend open time for construction flexibility
- Reduce sagging and shrinking
- Control setting time based on project needs
Key Factors of HPMC That Affect Heavy Gypsum Quality
Below are the HPMC characteristics that most affect gypsum performance:
1.Viscosity
Higher viscosity HPMC increases water retention and film strength.
Recommended: 20,000–45,000 cps (Brookfield @2% solution, 20℃).
2.Gel Temperature
The gel temperature affects the heat resistance. A higher gel point allows gypsum to resist heat during curing.
Ideal range: 60–75℃.
3.Substitution Type (Methoxy and Hydroxypropyl Content)
These control water retention and film formation.
Balance is critical: too much may delay setting time.
4.Particle Size
Finer HPMC disperses more evenly in gypsum.
Target: 80–100 mesh.
How to Adjust HPMC to Improve Heavy Gypsum
Depending on your final product and environment, you can adjust:
| Performance Goal | Adjustment |
| Better water retention | Increase viscosity or dosage |
| Faster setting time | Lower substitution level |
| Better spreadability | Use finer particle size |
| Smoother finish | Choose high-purity HPMC |
| Crack resistance | Ensure consistent water retention |
Kehao Chemical’s HPMC for Heavy Gypsum
At Shijiazhuang Kehao Chemical Co., Ltd., we provide customized HPMC solutions for gypsum-based products. Our product advantages include:
- Consistent quality
- Adjustable viscosity levels
- Fine particle size for even mixing
- Stable supply for large-scale production
HPMC (Hydroxypropyl Methylcellulose) is essential in heavy gypsum formulations. It improves water retention, workability, and strength. Key factors such as viscosity, substitution level, and particle size directly affect gypsum performance. At Kehao Chemical, we offer customizable HPMC for gypsum systems, ensuring reliable and efficient results in your projects.
