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Gypsum-Based Products Additives

-- Steady & Reliable Manufacturer --

HPMC additives tailored for gypsum-based building products, supporting water retention, workability and consistent setting behavior across plaster, joint compound and gypsum board applications.

Product Overview

This range is developed for gypsum plaster, joint compound for gypsum board, gypsum-based decorative products, and gypsum self-leveling underlayment, where the additive interacts closely with the hydration chemistry of the gypsum binder rather than acting as an inert filler.

Cellulose ether dosage and viscosity grade mainly influence setting behavior indirectly through water retention rather than by directly retarding the gypsum reaction, while fineness affects how quickly the powder dissolves and disperses evenly in the gypsum slurry.

ParameterTypical Value
AppearanceWhite to off-white powder
Viscosity (2% solution, mPa·s)10,000 - 60,000, grade dependent
pH (1% solution)6.0 - 8.0
Moisture content≤ 6%
Fineness (through 100 mesh)≥ 98%
Water retention rate (gypsum system)95% - 98%
Dissolution timeFast-dissolving, grade dependent
Ionic characterNon-ionic
Packaging25 kg bag, or as agreed

Application

Suitable for machine-applied and hand-applied gypsum plaster, gypsum board joint compound and joint filler, gypsum-based decorative products, and gypsum self-leveling underlayment.

  • Machine-sprayed and hand-applied gypsum plaster
  • Joint compound and joint filler for gypsum board
  • Gypsum-based decorative and cornice products
  • Gypsum-based self-leveling underlayment

For machine application, a fast-dissolving, low-fisheye grade is generally preferred to avoid blockages and ensure smooth pumping through the spray equipment.

Advantages

Core Benefits
  • Reliable water retention supports full gypsum hydration
  • Good workability and sag resistance during application
  • Fast dissolution suited to both hand and machine application
Additional Benefits
  • Consistent particle size for smooth, lump-free slurry
  • Compatible with common gypsum board joint compound recipes
  • Supports a smooth, easily sandable finished surface

Frequently Asked Questions

  • Q: How does this additive affect the water retention of gypsum plaster?

    A: It slows moisture loss from the wet plaster into the substrate or air, helping the gypsum hydrate more completely and reducing the risk of a weak, chalky surface.

  • Q: Will it change the setting time of the gypsum?

    A: It has limited direct effect on setting time, since gypsum setting is mainly controlled by the binder and any dedicated retarders in the formulation, but indirect effects on workability can be noticeable.

  • Q: Is it suitable for machine-applied plastering systems?

    A: Yes, fast-dissolving, low-fisheye grades are specifically selected for machine spray application to avoid pump blockages and ensure even flow.

  • Q: Can it be used in gypsum board joint compound?

    A: Yes, it is a common component of joint compound and joint filler recipes, helping control open time and sag resistance during taping and finishing.

  • Q: How does dosage affect workability and sag resistance?

    A: Higher dosage generally increases viscosity and sag resistance, but excessive dosage can make the mix feel sticky or slow to apply, so dosage should be optimized per formula.

  • Q: What fineness grade is recommended for fast dissolution in gypsum slurry?

    A: Finer, superfine grades are recommended where fast, lump-free dissolution is needed, particularly for machine application or thin decorative products.

  • Q: Is special mixing equipment required?

    A: Standard mechanical mortar mixers are generally sufficient; what matters most is adequate mixing time to ensure the additive is fully and evenly dispersed before application.

About Us
Zhejiang Yisheng New Material Co., Ltd.
Zhejiang Yisheng New Material Co., Ltd. is a professional enterprise engaged in the design, development, manufacturing, application, and sales of cellulose ether, located in the Shangyu Economic and Technological Development Zone, part of the Hangzhou Bay National Industrial Park. With a core concept of safety, environmental protection, and sustainable development, the company boasts an annual production capacity of 15,000 tons of cellulose ether, offering a complete range of products including HEC (hydroxyethylcellulose), HEMC (hydroxyethyl methylcellulose), and HPMC (hydroxypropyl methylcellulose). Our products serve various sectors such as oil fields, coatings, dry powder mortar, cosmetics, personal care products, medicine, and many others. Yisheng has a global presence, providing stable cellulose ethers and services to customers worldwide.
As a professional China Gypsum-Based Products Additives Supplier and Gypsum-Based Products Additives Company, The company adheres to the principles of safety and environmental protection as the foundation of its development. It implements and further consolidates safety and environmental protection measures, striving to create green and environmentally friendly production processes, safe and effective control systems, and orderly production management. This approach lays a solid foundation for the company's sustainable development. Yisheng boasts a scientific management mechanism, a comprehensive quality management system, stringent product testing methods, advanced technology, state-of-the-art equipment, and high-quality after-sales service.
Zhejiang Yisheng New Material Co., Ltd.

+86-18067879812
Zhejiang Yisheng New Material Co., Ltd.

sarah@ys-cellulose.com
Zhejiang Yisheng New Material Co., Ltd.