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Self-Leveling Compound Additives

-- Steady & Reliable Manufacturer --

HPMC and HPS based additives engineered for self-leveling floor compounds, supporting smooth flow, controlled setting behavior and a level, ready-to-finish surface.

Product Overview

Self-leveling underlayments and screeds, whether cement-based or gypsum-based, need flow modifiers that keep the mix pumpable and able to self-flatten across the floor without segregating aggregate or trapping air. This series is built around that requirement.

Hydroxypropyl starch ether (HPS) is often blended with HPMC in self-leveling systems to balance flow time with resistance to aggregate settlement, helping avoid common defects such as pinholing and shrinkage cracking in the finished floor.

ParameterTypical Value
AppearanceWhite to off-white powder
Viscosity (2% solution, mPa·s)400 - 20,000, grade dependent
pH (1% solution)6.0 - 8.0
Moisture content≤ 6%
Fineness (through 100 mesh)≥ 98%
Flow retention time20 - 40 minutes, formula dependent
Water retention rate96% - 99%
Ionic characterNon-ionic
Packaging25 kg bag, or as agreed

Application

Application AreaNotes
Cement-based self-leveling underlaymentImproves flow and surface smoothness before final floor covering
Gypsum-based flooring compoundSupports pumpability and helps reduce pinholing
Underfloor heating screedsMaintains workability over longer pour and finishing times
Repair and patching compoundsAids leveling and finish in small-area repair work

Advantages

  • ➤ Smooth, self-flattening flow across the floor surface
  • ➤ Reduced pinholing through balanced air release
  • ➤ Good resistance to aggregate settlement during flow time
  • ➤ Compatible HPMC and HPS combination for tunable flow time
  • ➤ Reliable water retention supports uniform cement hydration
  • ➤ Suited to both manual and pump-applied installation methods

Frequently Asked Questions

  • Q: What is the role of HPS versus HPMC in a self-leveling compound?

    A: HPMC mainly contributes water retention and viscosity control, while HPS is often added to help fine-tune flow time and reduce the risk of aggregate settlement.

  • Q: How is flow time controlled in a self-leveling floor mix?

    A: Flow time is adjusted through the dosage and viscosity grade of the cellulose ether and starch ether, along with the water-to-powder ratio used at mixing.

  • Q: What causes pinholing in self-leveling floors and how can it be reduced?

    A: Pinholing usually results from trapped air rising slowly through a thick, self-leveling mix; balanced viscosity and appropriate defoamer use both help reduce it.

  • Q: Can this additive be used with underfloor heating systems?

    A: Yes, self-leveling compounds using these grades are commonly used over underfloor heating systems, provided the manufacturer's curing and heating start-up guidance is followed.

  • Q: What is the recommended dosage for a cement-based self-leveling compound?

    A: Dosage is typically in the range of 0.1% to 0.3% by weight of the dry mix, depending on the target flow time and pumping method.

  • Q: Does it affect the final compressive strength of the floor?

    A: At recommended dosage the effect on strength is minor, but overdosing can trap excess air or slow hydration, which may reduce ultimate strength.

  • Q: How long is the typical working time after mixing?

    A: Working time is generally around 20 to 40 minutes depending on the formula and ambient temperature, after which the material begins to set and lose flow.

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 Self-Leveling Compound Additives Supplier and Self-Leveling Compound 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.