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Radiation Cross Linked Polyethylene Repair Patch
Product Highlights
Product Description
Radiation Cross-Linked Polyethylene Repair Patch is a sheet-form pipeline anti-corrosion material manufactured with a radiation cross-linked polyethylene backing and a specialized hot-melt adhesive on the inner surface. The radiation cross-linked material offers high mechanical strength, excellent aging resistance, and superior chemical corrosion resistance. The hot-melt adhesive provides strong bonding and reliable sealing performance. The product complies with GB/T 23257-2017 technical standard.
The repair patch is designed for quick and effective field repair of damaged pipeline anti-corrosion coatings. Its flexible yet durable construction allows it to conform to curved pipe surfaces while maintaining a robust protective barrier.
Recommended Applications
- Pipeline coating damage repair (scratches, gouges, and abrasions)
- Field repair of 3LPE, 2LPE, FBE, and other pipeline coating systems
- Repair of heat shrink sleeve damage at field joints
- Emergency pipeline coating repair during construction and operation
- Touch-up and patching of coating defects before pipeline lowering
System Composition
The repair patch can be used as a standalone repair solution. For enhanced performance, it can be combined with a repair stick to fill deeper gouges before patch application.
- Standalone use: Applied directly over the cleaned and preheated damaged area. Heat the patch to shrink and bond it to the existing coating.
- With Repair Stick (JY-307): For deeper damage or gouges, fill the cavity with repair stick material first, then apply the repair patch over the filled area.
Performance Index
| Tensile Strength (MPa) | ≥17 |
| Nominal Fracture Strain (%) | ≥400 |
| Vicat Softening Point (°C) | ≥90 |
| Volume Resistivity (Ω·m) | ≥1×10¹³ |
| Adhesive Softening Point (°C) | ≥110 |
| Peel Strength to Steel (23°C) (N/cm) | ≥50 |
| Peel Strength to PE (23°C) (N/cm) | ≥50 (cohesive failure) |
Installation Guide & Precautions
Installation Method
The repair patch is applied using a propane torch or heat gun. The patch shrinks and bonds to the existing coating when heated, forming a seamless repair.
Quick Installation Steps
- Damage assessment and preparation: Clean the damaged area thoroughly. Remove dirt, moisture, and loose coating fragments.
- Surface preparation: For steel surface exposure (full-depth damage), clean and blast the exposed steel to Sa2.5. For coating-only damage, roughen the surrounding coating surface with sandpaper.
- Preheat the area: Preheat the damaged area and surrounding coating to 60°C-70°C (or as specified by the manufacturer).
- Cut the patch: Cut the repair patch to a size that extends at least 50mm beyond the damaged area in all directions.
- Position the patch: Place the patch over the preheated damaged area with the adhesive side down.
- Apply heat: Using a propane torch, heat the patch evenly from the center outward. Shrink until the patch lies flat and the adhesive flows out slightly at the edges.
- Final inspection: Press the patch firmly, especially at the edges. Check for complete adhesion, no bubbles, and full coverage of the damaged area.
Key Reminders
- Do not overheat — excessive heat can burn the patch material. Keep the torch moving at all times.
- Heat from the center outward — this prevents air entrapment and ensures smooth adhesion.
- Overlap is critical — the patch must extend at least 50mm beyond the damaged area for proper sealing.
- For deep damage: Fill deeper gouges (≥2mm) with repair stick before applying the patch.
- Clean the area thoroughly — contaminants will prevent proper adhesion.
- Storage: Keep in original packaging in a dry, cool area below 35°C, away from direct sunlight and heat sources.
