Gypsum Retarder

Product Description

Gypsum retarder is a setting-control additive for gypsum and calcium-sulfate-based materials. It slows the hydration, crystallization, and hardening process, extending setting time and workability so that mixing, conveying, leveling, application, and finishing can be completed more efficiently.

Gypsum retarders are available in different chemical systems, including protein-based, modified amino-acid, and phosphate-based formulations.

Key Benefits

• Extends setting time and open time
• Improves the workability of gypsum-based materials
• Provides more operating time for large-area or machine-applied projects
• Supports consistent production and application processes
• Allows setting time to be adjusted for different formulation requirements

Applications

• Gypsum plaster and finishing plaster
• Gypsum putty and joint fillers
• Gypsum adhesives
• Gypsum self-leveling compounds
• Precast gypsum components
• Molding and modeling plaster
• Gypsum-based decorative materials

Application Guidelines

• Select the appropriate grade and dosage according to the gypsum origin, hemihydrate type, system pH, ambient conditions, and required setting time.
• Conduct laboratory and production trials before full-scale use.
• Verify compatibility when combining the retarder with cellulose ethers, superplasticizers, defoamers, or other additives.
• Follow the product-specific technical data sheet and safety data sheet for handling, storage, and use.