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Hydroxyethyl Methylcellulose Supplier

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Brief Product Description

Hydroxyethyl methylcellulose (HEMC) is a mixed cellulose ether carrying both methyl and hydroxyethyl substituents, combining the water retention and workability benefits of HPMC with the improved wetting and electrolyte compatibility of HEC. It is widely used as a functional additive in building materials, construction chemicals, and water-based coatings. Yisheng manufactures HEMC under the EASONZELL™ ME Series in building material and coating grades, offering viscosities from 5,000 to 100,000 mPa·s for a range of construction and industrial applications.

Product Overview

HEMC occupies a distinctive middle ground between HEC and HPMC in the cellulose ether family. The methyl groups introduce mild thermal gelation behavior and surface activity, while the hydroxyethyl groups moderate gelation temperature, improve wettability of dry ingredients, and extend compatibility with electrolyte-containing systems. The net result is a cellulose ether that performs reliably across a broader range of cement and gypsum chemistry conditions than pure HPMC in some formulations.

In building material applications, HEMC is particularly valued in gypsum-based products (machine plasters, joint compounds, skimming plasters) where its electrolyte compatibility and moderate gelation temperature provide longer workability and improved surface smoothness compared to high-methoxy HPMC grades. In coating applications, HEMC provides a flatter, more matte appearance in interior emulsion paints compared to HEC, which can be advantageous in premium architectural finishes.

Yisheng's HEMC is available in both standard (cold-water dissolving) and surface-treated (delayed-dissolve) forms. Surface-treated grades are essential for industrial dry-mix mortar production lines where the cellulose ether must survive mechanical blending and bagging without premature hydration.

Specification

ParameterBuilding Material GradeCoating Grade
AppearanceWhite to off-white powderWhite to off-white powder
Methoxy Content (%)19 – 2419 – 24
Hydroxyethoxy Content (%)3 – 103 – 10
Viscosity Range (2%, mPa·s)5,000 – 100,0005,000 – 60,000
Gelation Temperature (°C)65 – 8565 – 85
Moisture Content (%)≤ 5.0≤ 5.0
Ash Content (%)≤ 5.0≤ 5.0
pH (1% solution)6.0 – 8.56.0 – 8.5
Dissolution FormStandard / Surface-treated delayedStandard
Mesh Size60 – 100 mesh80 – 120 mesh
Packaging25 kg kraft bag; 500 kg big bag

Application

  • Gypsum-Based Plasters & Skim Coats: HEMC's compatibility with calcium sulfate chemistry and its extended workability window make it the preferred cellulose ether for machine-applied gypsum plasters. It reduces sagging on vertical surfaces and improves surface smoothness.
  • Joint Fillers & Finishing Compounds: In interior joint compounds and finishing plasters, HEMC provides the smooth trowelability and crack resistance required for high-quality interior surface finishing.
  • Self-Leveling Underlayments: HEMC controls the flow and setting behavior of self-leveling floor compounds, preventing excessive bleed water while maintaining adequate flow for self-leveling action.
  • Interior & Exterior Emulsion Paints: Coating-grade HEMC functions as a thickener with good flow and levelling characteristics, providing a slightly flatter sheen in matte and eggshell finishes compared to HEC-thickened paints — advantageous for premium interior paint brands.
  • Repair Mortars & Waterproofing Slurries: HEMC improves the application properties of cementitious repair mortars and crystalline waterproofing systems, extending pot life and preventing rapid drying on hot substrates.

Formulation Note: HEMC can replace HPMC on a near 1:1 basis in most mortar formulations with minor viscosity adjustments. For gypsum systems specifically, HEMC is often preferred over HPMC due to its lower sensitivity to the ionic environment created by dissolved calcium and sulfate ions.

Advantages

  • Superior Electrolyte Tolerance: Hydroxyethyl substitution improves stability in high-ionic-strength environments such as gypsum, cement, and lime systems — reducing viscosity loss compared to high-methoxy HPMC grades.
  • Improved Wettability: The hydroxyethyl groups improve the wetting of dry cement, gypsum, and filler particles, enabling faster, more homogeneous mixing and reducing the risk of dry lumps in the finished mortar.
  • Longer Open Time: HEMC delivers consistently longer working times in tile adhesives and plasters compared to equivalent HPMC grades in gypsum-dominated systems, reducing waste and rework.
  • Good Compatibility with Defoamers: HEMC shows lower tendency to interact negatively with common construction chemical defoamers compared to some high-MS HPMC grades, simplifying formulation of foam-controlled mortars.
  • Flexible Grade Range: Viscosity range 5,000–100,000 mPa·s covers the full spectrum of building material and coating requirements without the need to source multiple suppliers.
  • EASONZELL™ ME Brand Quality: Manufactured under Yisheng's EASONZELL™ brand with full quality documentation, the ME Series provides the consistency and traceability required by industrial dry-mix producers who need to maintain tight formulation control across production batches.

Frequently Asked Questions

  • Q: When should I choose HEMC over HPMC for a mortar formulation?
  • A: HEMC is generally preferred over HPMC in gypsum-rich formulations (machine plasters, joint compounds) because its hydroxyethyl groups provide better stability in the calcium and sulfate ion environment of gypsum hydration. In purely cementitious systems (tile adhesives, renders), HPMC and HEMC perform comparably and selection may be based on cost, viscosity availability, or local market preference.
  • Q: What is the gelation temperature of HEMC and how does it compare to HPMC?
  • A: HEMC typically gels at 65–85°C depending on the methoxy/hydroxyethoxy ratio, which is generally 5–15°C higher than equivalent methoxy-content HPMC grades. Higher gelation temperature can be advantageous in applications where the mortar or coating is exposed to direct sunlight or high ambient temperatures during application, as it reduces the risk of premature stiffening at the surface.
  • Q: Can HEMC be used in paints alongside associative thickeners?
  • A: Yes. HEMC is compatible with both HASE and HEUR associative thickeners and is frequently used in combination with these to balance in-can viscosity, brushing viscosity, and sag resistance. HEMC contributes primarily to high-shear viscosity and in-can stability, while associative thickeners provide low-shear sag control. The combination allows formulators to achieve a balanced rheology profile without excessive use of either thickener type.
  • Q: Is HEMC available in surface-treated (delayed-dissolve) form?
  • A: Yes. Surface-treated HEMC grades are available for dry-mix mortar factory production, where the cellulose ether must be blended with cement, gypsum, and other dry ingredients without premature hydration. The surface treatment delays dissolution until the end user adds water on site. Standard (non-surface-treated) grades are appropriate for direct addition to water in wet-mix applications.
  • Q: How does the hydroxyethoxy content affect HEMC performance?
  • A: Higher hydroxyethoxy content increases water solubility, reduces gelation temperature, improves electrolyte tolerance, and lowers the thermal gelation strength. Lower hydroxyethoxy content (with proportionally higher methoxy content) gives behavior closer to HPMC with stronger gelation and higher thickening efficiency at equivalent molecular weight. Yisheng offers grades across this spectrum to match specific application requirements.
  • Q: Can Yisheng provide technical support for formulation development using HEMC?
  • A: Yes. Our applications laboratory provides formulation trials, dosage optimisation, and comparative testing services for customers developing new dry-mix mortar or coating products. We can test your current formulation with our HEMC grades and provide application test reports covering open time, water retention, mechanical properties, and rheological profiles. Contact our technical sales team to arrange an application development consultation.

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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 Hydroxyethyl Methylcellulose Supplier Supplier and Hydroxyethyl Methylcellulose Supplier 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.