Gypsum retarders are setting control additives used to precisely regulate the hydration rate of gypsum-based materials. By slowing the setting reaction in a controlled manner, they extend workable time for mixing, pumping, application, and finishing, without adversely affecting final strength or appearance.
These additives are characterized by high efficiency at low dosages, stable and predictable performance, and excellent compatibility with other gypsum admixtures such as plasticizers, thickeners, and starch ethers. They help ensure uniform setting, reduced cracking, smooth surfaces, and consistent quality under varying raw material and ambient conditions.
Key Features & Advantages
- Highly Effective Retardation with Adjustable Setting Time — A small dosage (typically 0.05%–0.3%) extends the initial setting time from 5–15 minutes to 30–120 minutes or longer, giving full control over working time for different project needs.
- Minimal Strength Loss (<5%) — Advanced amino acid/protein-based formula ensures final strength remains almost the same as non-retarded gypsum, outperforming traditional citric acid or tartaric acid retarders.
- Fine White Powder, Excellent Dispersibility — Uniform, free-flowing white or off-white powder that mixes easily (dry or wet), with no clumping and no negative impact on the whiteness or aesthetics of the final product.
- Eco-Friendly & Low-Toxicity — Made from bio-based or food-grade modified raw materials, complies with REACH, RoHS, and low-VOC standards — safe for indoor applications with no formaldehyde release.
- Outstanding Compatibility & Stability — Excellent thermal stability and good compatibility with most gypsum types, cellulose ethers, defoamers, and other common additives.
- Cost-Effective & Waste-Reducing — Low addition rate delivers high performance, significantly reduces material waste from premature setting, and improves overall construction efficiency.
- Odorless & Low-Dust — User-friendly formula creates a cleaner and more comfortable working environment on job sites.
Typical Applications
- Gypsum Plaster / Rendering — Ideal for manual or machine-sprayed interior wall and ceiling plastering, allowing ample time for smoothing and finishing.
- Gypsum Putty / Joint Compound — Perfect for wall leveling, skimming, drywall joint filling, and seam taping to prevent cracking due to fast setting.
