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EIFS & External Wall Insulation Additives

-- Steady & Reliable Manufacturer --

HEMC and RDP based additives for External Insulation and Finish Systems (EIFS), supporting strong adhesive and base coat performance, weather resistance and long-term facade durability.

Product Overview

EIFS and ETICS systems bond insulation board to the building substrate, reinforce it with a base coat mortar and embedded mesh, then finish with a textured render. This additive range is developed for the adhesive and base coat mortars that hold the whole system together.

Freeze-thaw resistance and flexibility are important for exterior exposure, and redispersible powder contributes crack-bridging ability and adhesion, while HEMC provides the water retention needed for proper cement hydration in the thin layers typically used in these systems.

ParameterTypical Value
AppearanceWhite to off-white powder
Viscosity (2% solution, mPa·s)20,000 - 60,000, grade dependent
pH (1% solution)6.0 - 8.0
Moisture content≤ 6%
Fineness (through 100 mesh)≥ 98%
Water retention rate97% - 99%
Redispersion time (RDP component)Within a few minutes of contact with water
Ionic characterNon-ionic
Packaging25 kg bag, or as agreed

Application

Used in EIFS and ETICS adhesive mortar for bonding insulation board, in base or reinforcing coat mortar embedding the mesh layer, and in the textured finish render applied over the system.

  • Insulation board bonding (adhesive) mortar
  • Base coat / reinforcing (armor) coat mortar with embedded mesh
  • Textured and decorative finish render over the insulation system
  • Compatible with both EPS and mineral wool insulation board systems

Mixing should follow the mortar manufacturer's water ratio and mixing time guidance closely, since both under-mixing and over-thinning can reduce bond strength and workability.

Advantages

  • – Reliable adhesion between insulation board and substrate
  • – Improved freeze-thaw resistance for exterior exposure
  • – Crack-bridging flexibility contributed by RDP component
  • – Consistent water retention for proper hydration in thin layers
  • – Works across both EPS and mineral wool insulation systems
  • – Supports long-term facade durability under weather cycling

Frequently Asked Questions

  • Q: What is the role of the additive in EIFS adhesive mortar?

    A: It provides water retention and workability so the adhesive stays open long enough to properly bond the insulation board while cement hydration completes.

  • Q: How does it help with adhesion between insulation board and substrate?

    A: Combined with RDP, it helps the mortar wet out and grip both the substrate and the insulation board surface, improving the strength and reliability of the bond.

  • Q: Is it suitable for both mineral wool and EPS insulation board systems?

    A: Yes, formulations using these grades are used across both insulation board types, though the overall mortar recipe may be adjusted for each.

  • Q: Does it improve freeze-thaw resistance of the base coat?

    A: Yes, together with RDP it contributes to a denser, more flexible film that better withstands repeated freeze-thaw cycling in exterior applications.

  • Q: Can it be used in both adhesive and reinforcing (armor) coat layers?

    A: Yes, the same grade family is commonly used in both layers, though dosage and the RDP ratio may differ between the two mortar types.

  • Q: What is the recommended dosage for EIFS base coat mortar?

    A: Typical dosage is around 0.2% to 0.4% by weight of the dry mix for the cellulose ether component, with RDP added separately per the mortar design.

  • Q: How should the mortar be mixed and applied for best results?

    A: Mix with the recommended amount of clean water using mechanical mixing until lump-free, then apply within the mortar's stated open time for the best bond and finish.

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 EIFS & External Wall Insulation Additives Supplier and EIFS & External Wall Insulation 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.