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Polypropylene heat shrink field joint coatings enjoys very good compatibility with the plant applied three-layer polypropylene coated linepipe.
Structure:
The PP heat shrinkable sleeve is consist of irradiation cross-linked and stretched polypropylene backing and modified high shear strength polypropylene adhesive. It formed into pre-cut wrap around sleeve with a separate closure system, and applied on 2-component solvent-free liquid epoxy primer.
The Backing consists of a cross-linked and stretched polypropylene backing which is designed to partially or fully recover with heat from a touch during application. The backing also provides resistance against mechanical damage and UV resistance during construction and in service.
The modified polypropylene adhesive with perfect adhesion to the epoxy primer, the PP backing and the factory applied 3LPP coatings.
| 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*10^16 | 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 |
Note:
