ISO 21809-3 Compliant Solvent-Free Fast Curing Epoxy Primer for Pipeline Field Joints and Heat Shrink Sleeves
High-Performance Epoxy Primer – ISO 21809-3 Compliant for Pipeline Field Joints
Product Introduction
Our high-performance epoxy primer is a two-component, solvent-free epoxy system specifically engineered for pipeline field joint corrosion protection. Fully compliant with ISO 21809-3 requirements, it serves as the critical bonding layer in heat shrink sleeve systems, ensuring field joints achieve the same level of protection as the mainline coating.
Key Features & Benefits
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ISO 21809-3 Compliant: Meets the stringent requirements of the international standard for field joint coatings, providing assurance of quality and performance.
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Superior Adhesion: Bonds firmly to blast-cleaned steel and compatible factory coatings including PE, PP, and FBE.
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Excellent Cathodic Disbondment Resistance: Protects against coating disbondment under cathodic protection, ensuring long-term integrity in buried and immersed conditions.
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Fast Curing: Rapid cure enables quick overcoating with heat shrink sleeves, improving field installation efficiency.
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High-Build Application: Recommended thickness of 150–500 μm can be achieved in a single application.
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Solvent-Free: 100% volume solids formulation minimizes VOC emissions and eliminates solvent entrapment risks.
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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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