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The initial layer consists of a compatible liquid epoxy primer as the primary corrosion protection layer. The liquid epoxy primer is a kind of solvent free epoxy coating and formulated to be compatible with the polypropylene sleeve adhesive.
The 3LPP HSS forms the same three layer structure as the factory-applied 3LPP coating. With excellent resistance to corrosion, the FRDP-PP heat shrinkable sleeve not only meets the requirements of ISO/DIS 21809-3: Petroleum and Natural Gas Industries — External Coatings for Buried or Submerged Pipelines used in Pipeline Transportation Systems — Part 3: Field Joint Coatings, but exceeds it.
The final coating system is suitable for the protection from external corrosion of buried field joints operating at temperatures up to a maximum of 110°C. With excellent anti-corrosion performance and compatibility with the pipeline plant applied three-layer polypropylene coated, weld joint polypropylene Heat Shrink Sleeves (HSS) are suitable for Pipelines that will operate in buried service from ambient temperature to 110°C for a 30 year design life.
| Item | Test Temperature | Unit | Result | Test Method |
| PP Backing | ||||
| Tensile strength | 23℃ | MPa | ≥30 | ASTM D638 |
| Elongation | 23℃ | % | ≥550 | ASTM D638 |
| Hardness | 23℃ | Shore D | ≥61 | ASTM D2240 |
| Water absorption, 24h | 23℃ | % | ≤0.1 | ASTM D570 |
| Volume resistance | —— | Ω.cm | ≥2×1016 | ASTM D257 |
| Low temperature brittleness | −40℃ | —— | Pass | ASTM D746 |
| Dielectric strength | —— | KV/mm | ≥25 | ASTM D-149 |
| Adhesive | ||||
| Melt point | —— | ℃ | 154 | ASTM D3418 |
| Lap shear strength | 23℃ | MPa | 5.5 | ISO21809-3 |
| 110℃ | MPa | 0.35 | ISO21809-3 | |
| Low temperature brittleness | −40℃ | —— | Pass | ASTM D746 |
| Ring-and-ball softening point | —— | ℃ | ≥150℃ | GB/T 4507 |
| Installed Sleeve | |||||
| Highest design temperature | —— | ℃ | 100 | —— | |
| Thickness | —— | mm | backing ≥1.0 adhesive ≥1.5 | ISO21809-3 Appendix A | |
| Cathodic disbandment, 28d | 23℃ | mm | 7.0 | ISO21809-3 | |
| 95℃ | mm | 15.0 | |||
| Peeling strength (10mm/min) | To steel with primer | 23℃ | N/mm | 9.8 | ISO21809-3 Appendix D |
| 110℃ | 2.4 | ||||
| To coating layer | 23℃ | 6.4 | |||
| 110℃ | 1.4 | ||||
| 28d, Tmax, peeling strength after hot water soaking (10mm/min) | To steel with primer | 23℃ | N/mm | 8.5 | ISO21809-3 Appendix I |
| To coating layer | 5.5 | ||||
| Serial No. | Specification | Serial No. | Specification |
| 1 | FRDPΦ168×500—1.2/1.0 | 7 | FRDPΦ508×500—1.5/1.0 |
| 2 | FRDPΦ219×500—1.2/1.0 | 8 | FRDPΦ529×500—1.5/1.0 |
| 3 | FRDPΦ273×500—1.2/1.0 | 9 | FRDPΦ610×500—1.5/1.0 |
| 4 | FRDPΦ325×500—1.2/1.0 | 10 | FRDPΦ711×500—1.5/1.0 |
| 5 | FRDPΦ355×500—1.2/1.0 | 11 | FRDPΦ813×500—1.5/1.0 |
| 6 | FRDPΦ426×500—1.5/1.0 | 12 | FRDPΦ1220×500—1.5/1.0 |
