HPMC for Plaster & Gypsum Applications
Plaster and gypsum-based mortars require excellent workability, controlled sag resistance, and sufficient open time, especially in mechanically sprayed applications.
U-4120 is a gypsum-specific modified Hydroxypropyl Methylcellulose (HPMC) developed to meet the processing and performance requirements of lightweight plaster and gypsum mortar systems, ensuring smooth application and improved construction efficiency.
U-4120 – Gypsum-Specific HPMC Grade
U-4120 is a modified HPMC specifically engineered for gypsum-based systems, combining medium-high viscosity with excellent solubility and stability.
It is particularly suitable for mechanically sprayed plaster, where stable rheology and sag resistance are critical.
Technical Specifications
| Item | Specification |
|---|---|
| Product Name | U-4120 |
| Chemical Name | Hydroxypropyl Methylcellulose |
| CAS No. | 9004-65-3 |
| Appearance | White or light yellow powder |
| Moisture Content | Max. 8.0% |
| pH Value | 5.0 – 9.0 |
| Bulk Density | 0.3 – 0.5 g/cm³ |
| Particle Size | Min. 90% pass through 80 mesh |
| Viscosity | 15,000 – 25,000 cps |
| Test Method | Brookfield, 20 °C, S6, 20 RPM, 2% solution |
Technical Support & Custom Optimization
Plaster and gypsum systems require application-oriented HPMC selection, not generic solutions.
At Keyoung Chemical, we provide targeted technical support to help customers optimize U-4120 performance.
Technical Services Include
- Dosage optimization for sprayed or manual plaster
- Sag resistance and open time adjustment
- Compatibility testing with gypsum and additives
Application Guidance
- Sample evaluation and formulation advice
- Troubleshooting for sagging or poor workability
- Practical recommendations based on construction conditions
Key Properties & Performance Benefits
Excellent Workability
U-4120 significantly improves the workability of plaster and gypsum mortars.
- Smooth spreading and spraying behavior
- Easy finishing and leveling
- Reduced operator fatigue during application
Enhanced Sag Resistance
The controlled viscosity of U-4120 helps reduce sagging, especially on vertical surfaces.
- Improves shape retention
- Supports thicker application layers
- Enhances surface uniformity
Extended Open Time
U-4120 provides sufficient open time for practical construction operations.
- Allows comfortable adjustment and finishing
- Reduces application pressure
- Improves construction efficiency on site
Stable Performance in Gypsum Systems
Designed specifically for gypsum chemistry, U-4120 delivers consistent and predictable performance.
- Compatible with gypsum binders
- Stable rheology during mixing and spraying
- Reliable performance across job-site conditions
Typical Applications
Specific application guidance can be provided based on your formulation and construction method.
Lightweight Plaster
Designed for lightweight plaster formulations, improving workability, sag resistance, and surface smoothness during manual or mechanical application.
Gypsum Mortar
Suitable for gypsum-based mortars requiring stable rheology, extended open time, and consistent construction performance.
Mechanically Sprayed Plaster
Optimized for sprayed plaster systems, ensuring smooth pumping, controlled sagging, and efficient application.
Packaging & Storage
- 25 kg paper-plastic composite bag with inner PE liner
- Store in dry and clean conditions
- Keep away from moisture and heat
Why Choose Keyoung Chemical
- Application-focused HPMC manufacturer
- Dedicated grades for tile adhesive, self leveling, and gypsum systems
- Stable quality and consistent viscosity control
- Technical support for formulation and construction optimization
- Reliable global supply and export experience
RFQs – Frequently Requested Questions
RFQ 1: What makes U-4120 suitable for gypsum applications?
U-4120 is a gypsum-specific HPMC providing excellent workability, sag resistance, and open time in plaster and gypsum systems.
Is U-4120 suitable for mechanically sprayed plaster?
Yes. U-4120 is particularly suitable for mechanically sprayed plaster, offering smooth sprayability and controlled sagging.
What is the recommended dosage of U-4120?
The typical dosage is 1.5–2.5 kg per ton, depending on formulation design and application method.
Does Keyoung Chemical provide formulation support for gypsum systems?
Yes. We offer technical support, dosage optimization, and application guidance for plaster and gypsum mortar formulations.
Request a Quote
Looking for HPMC for plaster and gypsum applications or U-4120 technical support?
Contact Keyoung Chemical to receive samples, formulation guidance, and competitive pricing.