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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 Water Retention Agent for Mortar Supplier and Water Retention Agent for Mortar 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.
Product Overview
When a thin-layer cement mortar is applied to an absorbent substrate — such as a fired clay brick, autoclaved aerated concrete (AAC) block, or cement board — capillary suction rapidly draws mixing water out of the fresh mortar. If too much water is lost too quickly, the cement grains do not fully hydrate, resulting in a weak, powdery, or delaminated mortar with poor bond strength. This is the fundamental problem that water retention agents solve.
Cellulose ethers work as water retention agents through a combination of mechanisms: their highly hydrophilic molecular structure binds water molecules within the polymer network, reducing the activity of free water and slowing its absorption into the substrate; and their viscosity-building effect reduces the hydraulic permeability of the fresh mortar, creating a physical barrier to water loss. HPMC and HEMC grades from Yisheng achieve water retention values of 95–99% (tested by EN 14891 or ASTM C1506 methods), even in direct contact with highly absorbent substrates.
Grade selection for water retention applications depends on the substrate porosity, mortar layer thickness, ambient temperature, and required open time. Yisheng's technical team can recommend the optimal viscosity grade and dosage for each combination of conditions, supported by in-house laboratory testing using standard substrate materials.
Specification
| Parameter | Standard WR Grade (HPMC) | High WR Grade (HEMC) |
|---|---|---|
| Chemical Type | Hydroxypropyl Methylcellulose | Hydroxyethyl Methylcellulose |
| Viscosity (2%, mPa·s) | 40,000 – 100,000 | 30,000 – 80,000 |
| Water Retention (%, EN 14891) | ≥ 95 | ≥ 97 |
| Dissolution Type | Surface-treated, delayed-dissolve | Surface-treated, delayed-dissolve |
| Recommended Dosage (%) | 0.15 – 0.35 | 0.15 – 0.30 |
| Moisture Content (%) | ≤ 5.0 | ≤ 5.0 |
| Mesh Size | 60 – 80 mesh | 60 – 80 mesh |
| pH (1% solution) | 6.0 – 8.0 | 6.0 – 8.5 |
| Compatible Systems | Cement, gypsum, lime | Cement, gypsum (preferred), lime |
| Packaging | 25 kg kraft bag; 500 kg big bag | |
Application
- Tile Adhesive on Highly Absorbent Substrates: Water retention is critical when setting tiles on AAC blocks, fired clay bricks, or old absorbent concrete. Without adequate water retention, the adhesive may lose bond strength before initial set — causing tile debonding after a few months of service. Dosage: 0.2–0.35% HPMC or HEMC.
- Machine-Applied Render on Brick & Block: Spray-applied renders on highly absorbent masonry substrates require high water retention to prevent premature stiffening that would cause adhesion failure and surface cracking. HEMC grades provide particularly good water retention in the gypsum-modified renders common in machine application systems.
- Wall Putty in Hot & Dry Climates: In regions with hot, dry, and windy conditions (Middle East, North Africa, South Asia), water loss from thin putty layers is extremely rapid. High water retention grades prevent drying before the putty sets, ensuring smooth, crack-free surfaces. Dosage may need to be increased by 10–20% versus temperate climate recommendations.
- Gypsum Plasters: Water retention in gypsum systems must be balanced — too little leads to poor surface quality; too much retards setting. HEMC grades are particularly well-suited to gypsum applications because they provide high water retention with lower risk of over-retardation compared to high-viscosity HPMC.
- Self-Leveling Underlayments: Water retention agents prevent excessive bleed water in self-leveling compounds, which would otherwise cause surface defects (pinholes, blistering) and reduce surface hardness through local water-to-cement ratio increase.
Important Note: Water retention value is temperature-dependent — it decreases as temperature increases. In hot-climate applications (above 35°C), specify a grade one viscosity level higher than standard recommendations to compensate for the thermal effect on water retention performance.
Email: sarah@ys-cellulose.com
Phone: +86-18067879812 / +86-575-82966958
