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Solvent-free Epoxy Primer
Product Highlights
Product Description
Solvent-Free Epoxy Primer is a high-performance, environmentally friendly primer formulated with modified epoxy resin as the primary film-forming material. It is 100% solids — utilizing reactive diluents and toughening agents, with no solvent content. The primer offers high strength, excellent corrosion resistance, and outstanding adhesion to steel substrates. It releases zero volatile organic compounds (VOCs) during application, making it safe for applicators and the environment.
Recommended Applications
- Base layer for heat shrink sleeves on pipeline field joint coating
- Base layer for visco-elastic systems on irregular surfaces (flanges, valves, fittings)
- Base layer for cold-applied tapes on buried steel pipelines
- Major pipeline repair and rehabilitation projects
- Corrosion protection base layer where high chemical resistance is required
System Composition
The solvent-free epoxy primer is a base layer designed to enhance adhesion between the steel substrate and the primary anti-corrosion material. It is not a standalone coating and must be over-coated with the appropriate anti-corrosion system.
- With Heat Shrink Sleeves: Applied to the prepared weld area before heat shrink sleeve installation
- With Visco-Elastic Systems: Optional base layer for enhanced adhesion on steel surfaces
- With Cold-Applied Tapes: Applied to the steel pipe before tape wrapping for improved bonding
Performance Index
| Appearance | Viscous liquid, uniform color |
| Color | Gray or as required |
| Solid Content (%) | ≥95 |
| Density (g/cm³) | 1.4 – 1.6 |
| Viscosity (mPa·s / 25℃) | 100 – 300 |
| Pot Life (23℃) | ≥30 min |
| Drying Time (23℃) – Touch Dry | ≤4 h |
| Drying Time (23℃) – Hard Dry | ≤24 h |
| Adhesion (Pull-off) | ≤2 Grade |
| Flexibility (mm) | ≤1 |
| Impact Resistance (J) | ≥4.9 |
| Hardness (Shore D) | ≥60 |
| Volume Resistivity (Ω·m) | ≥1×10¹² |
| Dielectric Strength (MV/m) | ≥25 |
| Cathodic Disbondment (65℃, 48h, mm) | ≤10 |
| Shear Strength (MPa) | ≥15 |
Installation Guide & Precautions
Quick Application Steps (as a base layer)
- Surface preparation: Clean and blast the steel surface to Sa2.5级. Ensure the surface is dry and dust-free.
- Mixing: Solvent-free epoxies are typically 2-component (resin + hardener). Mix thoroughly according to the manufacturer‘s ratio until a uniform color is achieved.
- Pot life: Use the mixed primer within its pot life (typically 15-30 minutes at 20°C). Do not mix more than can be applied in this time.
- Application: Apply the primer evenly using a brush, roller, or airless spray gun. Aim for a continuous, void-free film of the specified dry film thickness (typically 200-400µm).
- Curing: Allow the primer to cure until “tack-free“ (approximately 1-2 hours depending on temperature). Over-coating should occur within the manufacturer’s recommended window (usually 2-24 hours).
Key Reminders
- Surface is critical: Solvent-free epoxies are not forgiving of poor surface preparation. Strictly adhere to Sa2.5级.
- Temperature limits: Apply only when the pipe surface temperature is above the dew point and between 5°C and 40°C.
- Do not thin: Do not add solvents or thinners. This will destroy the ‘solvent-free’ properties and ruin adhesion.
- Cleaning: Clean tools immediately after use with epoxy thinner or acceptable substitute before the resin hardens.
- Storage: Store in original sealed containers in a dry, cool area (10°C-30°C), away from direct sunlight and moisture.