Fast-Curing Solvent-Free Epoxy Primer with Excellent Cathodic Disbondment Resistance for Heat Shrink Sleeve Installation
Fast-Curing, Solvent-Free Epoxy Primer for Heat Shrink Sleeve Installation
Product Introduction
Our two-component epoxy primer is engineered specifically as the critical bonding layer in heat shrink sleeve systems for pipeline field joint corrosion protection. Formulated with a 100% volume solids, solvent-free epoxy resin system, it delivers exceptional adhesion to blast-cleaned steel and compatible factory coatings while providing outstanding cathodic disbondment resistance—the key performance indicator for long-term pipeline integrity.
Key Features & Benefits
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Superior Adhesion: Bonds firmly to steel substrates and compatible mainline coatings (PE, PP, FBE), creating a durable foundation for the shrink sleeve adhesive layer.
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Excellent Cathodic Disbondment Resistance: Effectively resists coating disbondment under cathodic protection conditions, ensuring long-term corrosion protection in buried and immersed pipeline environments.
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Fast Curing: Rapid cure allows quick overcoating with heat shrink sleeves, reducing field application time and improving project efficiency.
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High-Build Application: Can be applied at recommended thicknesses of 100–200 μm in a single pass, ensuring complete surface coverage.
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Solvent-Free & Environmentally Friendly: 100% volume solids formulation minimizes VOC emissions and eliminates solvent entrapment risks.
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Heat-Assisted Force Cure: Available for accelerated curing when required, further shortening installation cycles.
Key Characteristics
| Aspect | Details |
|---|---|
| Composition | Two-component, 100% volume solids (solvent-free) epoxy resin system |
| Function | First layer of three-layer shrink sleeve system; prepares steel surface for adhesive bonding |
| Key Performance | Excellent cathodic disbondment resistance, fast curing, high-build application, strong adhesion to steel and factory coatings |
| Compatibility | PE, PP, FBE, PU, CTE, and bitumen mainline coatings |
| Application | Manual or machine application by hand, roller, or spray; applied to prepared steel surface before sleeve installation |
| Technical Standards | Compliant with ISO 21809-3, EN 12068, DIN 30672, and applicable GB/T standards |
Typical Properties
| Property | Typical Value |
|---|---|
| Type | Two-component, solvent-free |
| Color | Black |
| Recommended Thickness | 150–500 μm |
| Pot Life (23°C) | Approximately 20 minutes |
| Mixing Ratio | Varies by product (e.g., 100:28 or 4:1 by weight/volume) |
| Curing | Heat-assisted curing available for force-cure systems |
System Integration
This primer is designed to work as an integrated component of heat shrink sleeve systems, compatible with common field joint coating configurations including three-layer PE and PP systems. When used with compatible shrink sleeves, the complete system meets the requirements for operating temperatures up to 100°C or higher depending on grade. The epoxy layer provides the critical bond between the steel substrate and the shrink sleeve adhesive, forming a durable, watertight corrosion protection structure for pipeline field joints
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