Water-based two-component interface primer designed to increase bond strength and surface reliability on concrete and mortar.
Summary Benefits at a Glance
Stronger Bond – Improves adhesion for old-to-new concrete and repair layers
Seal & Dust Control – Reduces chalking; provides a clean, uniform surface
Wide Substrate Range – Concrete, mortar, steel, wood, tiles and stone
Easy to Use – Brush/roller/spray application; fast turnaround on site
Product Introduction
YJ-302 is a polymer-emulsion, water-based two-component interface treatment agent used to prepare concrete and mortar substrates prior to new overlays, repair mortars, waterproof layers or tile/stone finishes. It forms a thin, uniform film that increases bonding, seals and dust-proofs the surface and offers good compatibility with cementitious materials. Typical uses include leveling layers, new-to-old concrete connections (beams, slabs, columns), precast element repairs, tile/stone substrate priming, surface protection and dust control on industrial floors.
Product Parameters
| Property | A-Part | B-Part |
|---|---|---|
| Density (g/cm³) | 1.0–1.2 | 0.95–1.15 |
| Solid content (%) | 53 ± 2 | 28 ± 2 |
| Pot life (min) | 10 | |
| Tensile bond strength (MPa) | ≥ 1.2 | |
| Shear bond strength (MPa) | ≥ 2.5 | |
| Effective working time | Summer ≥ 2 h | Winter ≥ 3 h |
Product Usage
Surface preparation
Substrate must be sound, clean and dry; remove dust, laitance, oil and loose particles.
Mixing & ratios (guide)
Mix A : B as supplied (by weight), then dilute with clean water as required by the task.
Typical dilution (binder : water):
Always trial on site and adjust viscosity to achieve a thin, uniform film.
Interface treatment / leveling base: 1 : 1 – 1 : 4 (brush/roller/spray).
New-to-old concrete bonding: 1 : 1.5 (slurry/primer before placing repair mortar).
Tile/stone substrate: 1 : 2 – 1 : 4 (primer coat).
Application
Brush, roller or low-pressure spray a thin, even coat; avoid puddles.
For bonding slurry, scrub into the substrate; place repair mortar while the surface is tacky (follow method statement).
Minimum application temperature ≥ 5 °C. Keep A & B sealed when not in use.
Reference coverage (typical)
Interface/leveling primer: 0.2–0.3 kg/m²
Base leveling primer: ≈ 0.2 kg/m²
New-to-old concrete bonding layer: ≈ 0.3 kg/m²
Tile/stone substrate primer: ≈ 0.2–0.5 kg/m²（dependent on surface profile）
Packaging & storage
Plastic pails, 20 kg/set. Store cool and dry; shelf life 12 months unopened. Protect from frost and direct sun.
Product Documentation
YJ-302 Concrete Interface Treatment Agent
YJ-302 Concrete Interface Treatment Agent | Water-Based Bonding & Sealing Primer
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Our products have undergone rigorous testing at our national testing laboratory (CABR testing center co., ltd). Renowned Fortune Global 500 firms such as China Railway Group Limited, China Communications Construction Company Limited, and Sinohydro are among our esteemed clients.
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