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WT heat shrinkable wraparound tape is designed for corrosion protection of field girth weld joint of buried and exposed steel pipelines, also for pipe bends or pipe elbow. WT consists of a radiation crosslinked low density polyethylene backing, coated with a hot sensitive adhesive which effectively bonds to steel substrates and common pipelines coatings, including polyethylene and fusion bonded epoxy.
WT can be conveniently used for corrosion protection of steel pipe, especially for protection and repairing pipelines, fittings, elbows, bends and other irregular configurations.
WT provides excellent resistance to cathodic disbandment resulting in effective long-term corrosion protection. The high performance crosslinked backing in combination with a broad of adhesive can be undertaken for regular or high stress environments. Upon the application of heat, wrap around tape shrinks down to fully encapsulate the protected substrate, the hot melting adhesive flows into all surface irregularities, forming a protective barrier against corrosion.
| Max. Operating Temperature | 70°C |
| Applicable Outer Coating | PE, FBE, PP |
| Preheat Temperature | 75°C |
| Derust Grade | Sa2.5, St3.0 |
(Standards: GB/T51241, GB/T23257 and other standards)
| Property | Performance | Standard | ||||
| WT (M50) | WT (60) | WT (80) | ||||
| Primer | ||||||
| Solid Content % | 99.3 | 99.4 | 99.6 | GB/T 1725 | ||
| Cathodic Disbonding (65°C, 48h) m | 5 | 4.8 | 4.3 | GB/T 23257 | ||
| Backing | ||||||
| Tensile Strength MPa | 21 | 24 | 24 | GB/T 1040.2 | ||
| Elongation % | 550 | 550 | 550 | GB/T 1040.2 | ||
| Density | 0.93 | 0.94 | 0.94 | GB/T 29046 | ||
| Dielectric Strength MV/m | 35 | 35 | 35 | GB/T 1408.1 | ||
| Volume Resistivity Ω·m | 4.0×1015 | GB/T 1040 | ||||
| Heat Aging (150°C, 21d) |
Tensile Strength MPa | 17 | 18 | 18 | GB/T 1040 | |
| Elongation % | 480 | 480 | 480 | |||
| Hot Melt Adhesive | ||||||
| Softening Point °C | 78 | 113 | 120 | GB/T 15332 | ||
| Lap Shear Strength MPa | 0.8 | 0.8 | 1.0 | GB/T 7124 | ||
| Brittle Temperature °C | -30°C | -20°C | -15°C | GB/T 23257 | ||
| Heat Shrinkable Sleeve | ||||||
| Shock Resistance J/mm | ≥5 no leakage points | GB/T 23257 | ||||
| Peel Strength N/cm (cohesion) |
to Primer Steel (23°C) | 90 | 160 | 140 | GB/T 23257 | |
| to PE (23°C) | 85 | 110 | 95 | |||
| to Primer Steel (Tmax) | 5 | 8 | 10 | |||
| to PE (Tmax) | 4 | 8 | 10 | |||
| Cathodic Disbonding mm |
23°C, 28d | 8.2 | 5.6 | 4.8 | GB/T 23257 | |
| Tmax, 28d | 12 | 8.6 | 9.4 | |||
| Peel Strength (Tmax Hot Water Immersion 28d) N/cm |
to Primer Steel (23°C) | 52 | 143 | 152 | GB/T 23257 | |
| to PE (23°C) | 56 | 145 | 162 | |||
| Heat Aging (Tmax+20°C, 100d) Peel Strength Retention % |
P₁oo/Po | 86 | 83 | 84 | GB/T 23257 | |
| Paop/P70 | 92 | 91 | 98 | |||
| Address: | 1288 Shexi Road, Beishe Community, Fenhu Town, Wujiang District, Suzhou City, Jiangsu Province, China |
| Telephone: | (0512) 63242988，63242266，63242260 |
| E-mail: | oversea@dasheng.com |
| Website: | www.dasheng.com |
