WD-850 Epoxy Grout for Tile and Stone

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Front view of WEIDU WD-850.
Front and back of WEIDU WD-850.
WEIDU WD-850 grout instructions view.
WEIDU WD-850 grout with box.

WD-850 Epoxy Grout for Tile and Stone

  • Density: 1.2–1.6 g/cm³

  • Mixing Ratio: 1:1 (by volume)

  • Formula: Advanced Two-Component Epoxy Ceramic Grout

  • Hardness: Shore D ≥70

  • Temperature Resistance: -30℃ to 80℃ (Long-term)

  • Customizable: Exclusive solutions for special scenarios (e.g., alpine, high salt spray)

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Overview

WD-850 Advanced Two-component Epoxy Ceramic Tile Grout is a high-performance, solvent-free formulation engineered specifically for tile joint sealing and premium decoration. Formulated with high-purity epoxy resin and a modified curing system, it is designed to cure rapidly into a dense, smooth surface, creating a robust, protective barrier that ensures safe, eco-friendly (low-VOC) use for residential and commercial spaces.

With a certified Grade 0 anti-mold performance and the ability to withstand extreme temperatures from -30°C to 80°C, WD-850 Advanced Two-component Epoxy Ceramic Tile Grout provides exceptional reliability for sealing gaps in kitchens, bathrooms, balconies, and underfloor heating areas. It delivers superior resistance to water, stains, chemicals, and yellowing with excellent adhesion to ceramic, natural stone, glass, and metal, making it the ideal aesthetic gap-filling solution for long-lasting, heavy-duty performance.

Technical Data

TDS

Applications

Applications

  • Professional Two-Component Epoxy Ceramic Grout for sealing and decorating tile joints
  • Gap-filling for residential and commercial spaces (kitchens, bathrooms, balconies, living areas)
  • Providing a durable, waterproof, and stain-resistant seal in underfloor heating areas
  • High-hardness joint filling resistant to mildew (Grade 0), chemicals, and UV yellowing
  • Eco-friendly, low-VOC finishing for indoor environments

Compatible Substrates

  • Ceramic tiles and ceramic mosaics
  • Natural stone, including marble and granite
  • Glass and metal surfaces
  • Most standard smooth and matt building surfaces

Not Recommended For

  • Long-term water immersion environments (e.g., swimming pools, indoor fish ponds)
  • Areas in direct contact with open flames (e.g., directly above stove open flames)
  • Undried substrates with a moisture content > 8%
  • Oily or unclean surfaces that compromise adhesion
  • Construction environments with temperatures < 5°C or humidity > 85% (this Two-Component Epoxy Ceramic Grout requires proper conditions for optimal curing)

How to Use?

Surface Preparation

  • Ensure all joints and bonding surfaces are completely dry, clean, and free from dust, oil, or water to guarantee maximum adhesion.
  • Verify that the joint depth is ≥ 2 mm and the joint width is between 2–10 mm for optimal grout application.
  • Do not apply on undried substrates with a moisture content > 8% or on oily, unclean surfaces, as this will compromise the bond.

Application Instructions

  • Strictly measure Component A and Component B at a 1:1 mixing ratio by volume.
  • Mix the components thoroughly using an electric mixer for at least 3 minutes to avoid incomplete mixing and ensure a uniform paste.
  • Inject the mixed Two-Component Epoxy Ceramic Grout evenly into the joints using a caulking gun, ensuring the gaps are fully filled.
  • Remove any excess material and smoothly tool the joints within the surface drying time limit of 1 to 2 hours.

Curing & Limitations

  • The mixed grout has a working time of 20 to 60 minutes. Ensure the area remains well-ventilated during and after application.
  • Surface drying occurs in 1 to 2 hours, but the grout requires 7 days to achieve full curing and its maximum high-hardness, waterproof properties.
  • Avoid scratches, impacts, walking, or water contact during the entire 7-day full curing period to ensure a flawless, Grade 0 anti-mold finish.
  • Do not apply this Two-Component Epoxy Ceramic Grout in environments where the temperature is below 5°C or the humidity is above 85%.

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