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3PP (Three-Layer Polypropylene) anti-corrosion heat shrink sleeves are advanced protective solutions designed to safeguard pipelines and joints from corrosion. These sleeves are particularly effective in harsh environments, providing a robust barrier against moisture, chemicals, and other corrosive elements.
— Ensures correct application of heat& allows easy post-heat inspection.
— Allows easy application combined with high functional performance.
— Provides high peel and shear values after installations.
— Keeps installation costs low.
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 |
100℃ | MPa | 0.55 | 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 |
100℃ | 3.1 | ||||
To coating layer | 23℃ | 6.4 | |||
100℃ | 2.4 | ||||
28d,Tmax , peeling | To steel with primer | 23℃ | N/mm | 8.5 | ISO21809-3 Appendix I |
To coating layer | 5.5 | ||||
Ordering Information | ||
Select sleeve width that will overlap onto the mill-applied coating by 2 inches( 50mm) minimum on each side of the weld joint. Take a 10% shrinkage during installation of sleeve width into account when calculating the minimum sleeve width. | Range for available dimension: | |
Sleeve length for 32 inch pipe | Length of PP shrink sleeves | |
Sleeve width | We can provide 450mm, 480mm, 500mm, 520mm and 550mm supplied PP shrink sleeves width. | |
Sleeve thickness | We can provide 2.2mm, 2.5mm, 2.8mm , 3.0mm and 3.2mm supplied PP shrink sleeves thickness. | |
Primer thickness | There are two kinds of primer application way, wet film and dry film. We can provide 120um, 150um, 200um, 300um and 400um primer thickness. | |
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