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HEMC Coating Grade

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Brief Product Description

HEMC (Hydroxyethyl Methyl Cellulose) coating grade is a high-performance cellulose ether designed specifically for aqueous paint and coating formulations. It provides superior viscosity stability across temperature ranges, excellent pseudoplastic flow, and outstanding compatibility with pigments and latex binders used in architectural and industrial coatings.

Product Overview

EASONZELL™ ME Series Coating Grade HEMC leverages the dual-substituted chemical structure of hydroxyethyl methyl cellulose to deliver viscosity performance that remains consistent even as application temperature fluctuates — an important advantage in regions with significant seasonal temperature variation or in spray application equipment where mortar temperature can rise.

Compared to standard HEC, HEMC coating grade offers improved bioresistance and slightly enhanced hydrophobicity due to the methyl groups, which can reduce susceptibility to microbial degradation in the can. It is compatible with all standard coating ingredients including TiO₂, latex binders, dispersants, and defoamers. Available in medium to high viscosity options to suit roller-applied, brush-applied, and spray-applied coating systems.

Specification

ParameterTypical Value / RangeTest Method
AppearanceWhite to off-white powderVisual
Viscosity (2% aq., 20°C)5,000 – 80,000 mPa·sASTM D2364
Methoxy Content (DS)1.2 – 1.8Titration
Hydroxyethoxy Content (MS)0.1 – 0.3Titration
Moisture Content≤ 5.0%ISO 585
Gel Temperature65 – 90°CCloud point
pH (1% solution)6.0 – 8.5pH meter
BioresistanceEnhanced vs. HEC (methyl groups)—
Recommended Dosage0.15 – 0.6% of formulation—

Application

EASONZELL™ HEMC Coating Grade is used in:

  • Interior and exterior latex paint — delivers Stormer (KU) and ICI viscosity targets; improves leveling without sagging.
  • Masonry and exterior render paint — high-viscosity grades provide body for roller and brush application on rough substrates.
  • Anti-corrosion primer — thickener and stabilizer in water-based anti-rust coating systems.
  • Texture coatings — contributes to the rheological body required in sand-finish and stone-effect coatings.

Usage notes: Add HEMC to the water phase at the start of mixing, before adding pigment slurry or binder. Ensure complete dissolution (30–60 min under moderate agitation) before proceeding. Avoid temperatures above 70°C during processing.

Advantages

  • Temperature-stable viscosity — viscosity is less affected by temperature swings vs. HEC, ensuring consistent in-can and on-wall performance year-round.
  • Improved bioresistance — hydrophobic methyl groups reduce susceptibility to enzyme-based microbial attack, extending in-can stability.
  • Excellent pigment suspension — maintains uniform pigment distribution and prevents hard sediment formation during storage.
  • Pseudoplastic flow — provides easy application under shear and excellent sag resistance after application.
  • Broad grade range — 5,000 to 80,000 mPa·s to cover low-sheen, semi-gloss, and high-build formulations.
  • Non-ionic — compatible with all common coating additives, binders, and colorant systems.

Frequently Asked Questions

  • Q: When should I choose HEMC over HEC for a coating formulation?
  • A: Choose HEMC when your coating will be sold or applied in regions with large temperature swings (hot summers, cold winters), when in-can microbiological stability is a concern, or when the coating will be applied by spray equipment that generates frictional heat. HEC remains an excellent and economical choice for stable-temperature, standard indoor applications.
  • Q: Does HEMC affect gloss in semi-gloss or gloss paint formulations?
  • A: At typical dosage levels (0.15–0.4%), HEMC has minimal impact on gloss. For very high-gloss systems (GU ≥ 80 at 60°), choose the lowest effective viscosity grade and the lowest effective dosage to minimize any potential sheen reduction.
  • Q: Is HEMC compatible with associative thickeners like HEUR or HMHEC?
  • A: Yes. HEMC can be used in combination with associative thickeners to fine-tune the Stormer/ICI viscosity ratio. HEMC primarily builds low-shear (Stormer) viscosity, while associative thickeners contribute to mid-shear and high-shear viscosity. The combination allows precise rheology profiling.
  • Q: How does HEMC dissolve in a high-pH coating formulation?
  • A: HEMC dissolves well in the pH 8–10 range typical of latex paint. At pH above 12, long-term viscosity stability may decrease due to alkaline hydrolysis of the ether bonds. For very high-alkaline systems, contact us for recommendations on suitable grade selection or formulation adjustment.
  • Q: What is the recommended dissolution method for HEMC in waterborne coatings?
  • A: Slowly add HEMC powder to water under moderate agitation (300–500 rpm). Avoid adding to biocide-containing water first, as some preservatives can interfere with initial dissolution. Allow 30–60 minutes for full hydration before proceeding with the rest of the formulation.
  • Q: Can HEMC be used in coatings for food-contact surfaces?
  • A: HEMC itself is generally recognized as non-toxic. However, for coatings applied to food-contact surfaces, the entire formulation must comply with applicable regulations (e.g., EU Regulation 10/2011 or FDA 21 CFR). Please consult your regulatory advisor for the complete formulation assessment.

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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 HEMC Coating Grade Supplier and HEMC Coating Grade 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.