for corrosion protection of shapes and irregular surfaces
NTD visco-elastic sealing tape is specially suited for corrosion protection of buried pipelines and irregular shapes such as bends, flanges, tees, valves, pumps etc. It consists of an inert chemical fiber material embedded in viscous and highly adhesive mastic. The outer side is covered with a special plastic material and the inner side (sticky side) is protected by a removable plastic film which is peeled away at the time of application. It is suitable for operating temperatures up to 95°C.
It is easy to apply and bonds well with all common substrates without the need of primer. It is non-toxic and adheres extremely well to steel and common pipe coatings like PE, PP, FBE, etc. It has unique cold flow and self-healing properties ensuring complete protection against water, air and dust. It is viscous and flows into all common irregularities on the steel surface, automatically covering small damages like dents and cuts. It is resistant to common chemicals and fungi. It provides outstanding corrosion protection and can be applied quickly and easily. It can be used on surfaces cleaned to grade St2.
Features & Benefits
Specifications
| TEST ITEM | 13A-2 TYPICAL DATA | 13A-3 TYPICAL DATA | TEST METHOD |
|---|---|---|---|
| Non-crystalline low viscosity polyolefin compound | |||
| Drip resistance | 90°C ,48h, Pass | 115°C ,48h, Pass | ISO21809-3 |
| Peel strength to pipe surface, N/mm | 0.429, Coverage > 95%@23°C | 0.654, Coverage > 95%@23°C | ISO21809-3 |
| Peel strength to pipe surface, N/mm | 0.087, Coverage > 95%@70°C | 0.029, Coverage > 95%@95°C | ISO21809-3 |
| Peel strength to plant applied coating, N/mm | 0.567, Coverage > 95%@23°C | 0.604, Coverage > 95%@23°C | ISO21809-3 |
| Peel strength to plant applied coating, N/mm | 0.078, Coverage > 95%,@70°C | 0.034, Coverage > 95%,@95°C | ISO21809-3 |
| Hot water immersion /Peel strength to pipe surface, N/mm | After 90°C ,100day, 0.494, Coverage > 95%,@23°C | After 95°C ,100day, 0.765,Coverage > 95%,@23°C | ISO21809-3 |
| Hot water immersion /Peel strength to pipe surface, N/mm | After 90°C ,100day, 0.026,Coverage > 95%,@70°C | After 95°C ,100day, 0.043,Coverage > 95%,@95°C | ISO21809-3 |
| Thermal ageing resistance /Peel strength to pipe surface, N/mm | After 90°C ,100day, 0.975,Coverage > 95%,@23°C | After 115°C ,100day, 0.770,Coverage > 95%,@23°C | ISO21809 |
| Thermal ageing resistance /Peel strength to pipe surface, N/mm | After 90°C ,100day, 0.111,Coverage > 95%,@70°C | After 115°C ,100day, 0.091,Coverage > 95%,@95°C | ISO21809 |
| Lap shear strength, N/mm² | 0.05,Coverage > 95%@23°C | 0.07,Coverage > 95%@23°C | ISO21809-3 |
| Lap shear strength, MPa | 0.01,Coverage > 95%@70°C | 0.01,Coverage > 95%@95°C | ISO21809-3 |
| Insulation resistance /R5100,Ωm² | 4.56x1010 | 4.58x1010 | ISO21809-3 |
| Insulation resistance /R5100/R570 | 0.84 | 0.85 | ISO21809-3 |
| Non-crystalline low viscosity polyolefin compound (Dasheng visco-elastic tape) + Outer wrap-Polymeric tape | |||
| Impact resistance, J | ≥ 15J | ≥ 15J | ISO21809-3 |
| Indentation resistance//Residual thickness, mm (1.0MPa, 23°C, ±2°C) | 2.49 | 1.63 | ISO21809-3 |
| Indentation resistance//Residual thickness, mm (1.0MPa, 70°C, ±2°C ) | 1.74 | 0.8 | ISO21809-3 |
| Cathodic disbondment resistance, mm | 0.mm no holiday (70°C±2°C ,28d)/td> | 0.mm no holiday (95°C±2°C ,28d)/td> | ISO21809-3 |
| Peel strength outer layer to outer layer, N/mm | 0.149 (70°C±2°C)/td> | 0.226 (95°C±2°C) | ISO21809-3 |
Ordering Information
Dasheng's inner and outer polymeric tapes cold applied tapes are made from a polyethylene backing coated with a layer of proprietary formulation consisting of butyl rubber. The installed product provides outstanding adhesion and elastic properties. It is highly adaptive to forces caused by changes in temperature and soil stress. It has excellent anti-aging and UV resistance properties. The high tensile strength and elongation of the backing material offers superior mechanical protection.
The inner tape is double faced adhesive coated. And both of them perform very well in protection and repair of pipelines, storage tanks bends etc.
The regular tape thickness is 0.7mm.
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Product Features
| ITEM | TYPICAL DATA | TEST METHOD |
|---|---|---|
| Holiday detection (holiday detection at 5kV/mm+5kV, max.25kV) | Pass | ISO 21809-3 |
| Impact resistance, J/mm (23°C) | >4 | ISO 21809-3 |
| Indentation resistance//Residual thickness, mm (1.0N/mm², 23°C) | 1.24 | ISO 21809-3 |
| Indentation resistance//Residual thickness, mm (1.0N/mm², 70°C) | 0.83 | ISO 21809-3 |
| Cathodic disbondment resistance, mm (23°C, 28d) | 8.9 | ISO 21809-3 |
| Peeling strength between layers, N/mm, 23°C (inner/inner) | 4.18 | ISO 21809-3 |
| Peeling strength between layers, N/mm, 23°C (outer/inner) | 3.25 | ISO 21809-3 |
| Peeling strength between layers, N/mm, 70°C (inner/inner) | Cohesive separation mode | ISO 21809-3 |
| Peeling strength between layers, N/mm, 70°C (outer/inner) | Cohesive separation mode | ISO 21809-3 |
| Peeling strength between layers, N/mm, 23°C (outer/outer) | 3.103 | ISO 21809-3 |
| Peeling strength between layers, N/mm, 70°C (outer/outer) | Cohesive separation mode | ISO 21809-3 |
| Peeling strength to steel surface, N/mm (23°C) | 1.369 | ISO 21809-3 |
| Peeling strength to steel surface, N/mm (70°C) | 0.1 | ISO 21809-3 |
| Peeling strength to plant coating, N/mm (23°C) | 1.482 | ISO 21809-3 |
| Peeling strength to plant surface, N/mm (70°C) | 0.053 | ISO 21809-3 |
| Hot water immersion (80°C, 28day)//peel strength to plant coating, N/mm (23°C) | 0.63 | ISO 21809-3 |
| Lap shear strength, N/mm² (70°C, 10mm/min) | 0.09 | ISO 21809-3 |
| Inner// Elongation at break (Eb4/Eb) after thermal ageing at 70°C (23°C) | 0.96 | ISO 527-3:2018 & ISO 527-3 |
| Outer// Elongation at break (Eb4/Eb) after thermal ageing at 70°C (23°C) | 0.94 | ISO 527-3 & ISO 527-3 |
| Peel strength between tapes after thermal ageing at 70°C (P70/P0) | 0.75 | ISO 21809-3 |
| Peel strength between tapes after thermal ageing at 70°C (P70/P0) | 0.96 | ISO 21809-3 |
| Peel strength to steel surface after thermal ageing at 70°C (P70/P0) | 1 | ISO 21809-3 |
| Peel strength to steel surface after thermal ageing at 70°C (P70/P0) | 1.04 | ISO 21809-3 |
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Dasheng's epoxy fiberglass reinforced plastic (FRP) tape, used for pipeline penetration, serves as the outer protective layer of the three-layer structure with polyethylene anti-corrosion coatings. The product comes in various structures such as two layers of fabric and five layers of resin, three layers of fabric and six layers of resin, four layers of fabric and seven layers of resin, etc.
Its main characteristics include high hardness and scratch resistance, providing effective protection for the pipeline's anti-corrosion coating when passing through challenging geological conditions such as hard rock formations.
Specifications
| NO. | PROPERTY | UNIT | VALUE | RANGE PERMITTED | TEST METHOD | |
|---|---|---|---|---|---|---|
| Fiberglass Cloth | ||||||
| 1 | Tensile Rupture Strength | Wrap | N/25mm | 292 | ≥ 190 | GB/T 7689.5-2013 |
| Weft | N/25mm | 226 | ≥ 180 | GB/T 7689.5-2013 | ||
| 2 | Fabric Density | Wrap | Thread/cm | 8.02 | 9±1 | GB/T 7689.2-2013 |
| Weft | Thread/cm | 8.16 | 9±1 | GB/T 7689.2-2013 | ||
| 3 | Basic Weight | g/m² | 149.9 | ≥ 130 | GB/T 9914.3-2013 | |
| 4 | Moisture Content | % | 0.13 | ≤ 0.30 | GB/T 9914.1-2013 | |
| 5 | Combustible Content | % | 0.19 | ≤ 0.20 | GB/T 9914.2-2013 | |
| 6 | Oxide Content in Alkalis | % | 0.5 | ≤ 0.8 | GB/T 1549-2008 | |
| Epoxy Coating Material | ||||||
| 1 | Solid Content (Epoxy Resin) | % | 98.6 | ≥ 95 | GB/T 1725-2007 | |
| 2 | Viscosity (@23°C, Epoxy Resin) | mPa·s | 38504 | 5000 ~ 40000 | GB/T 2794-2013 | |
| 3 | Viscosity (@23°C, Curing Agent) | mPa·s | 2885 | 300 ~ 3000 | GB/T 2794-2013 | |
| 4 | Gel Time (23°C) | min | 21 | ≥ 15 | GB/T 12007.7-1989 | |
| 5 | Dry Time (Surface dry, 23°C) | h | 1.01 | ≤ 2 | GB/T 1728-2020 | |
| 6 | Dry Time (Hard dry, 23°C) | h | 2.95 | ≤ 8 | GB/T 1728-2020 | |
| 7 | Resistance to 1° Bending | -- | Pass | No cracks, no holiday. | SY/T 6854-2012 Annex C | |
| 8 | Impact Resistance | J | No holiday. | ≥ 8 | SY/T 0315-2013 Annex E | |
| 9 | Hardness (Shore D) | HD | 90 | ≥ 80 | GB/T 2411-2008 | |
| 10 | Adhesion to PE (23°C) | MPa | 4 | ≥ 3.5 | SY/T 6854-2012 Annex A | |
| 11 | Adhesion to Epoxy Coating (23°C) | MPa | 16 | ≥ 7 | SY/T 6854-2012 Annex A | |
| Epoxy FRP | ||||||
| 1 | Appearance | -- | Pass | The surface is smooth and flat, no white hollows, no burrs, no wrinkles, no drops, no bubbles, no pinholes. | By visual. | |
| 2 | Barcol Hardness (23°C) | -- | 44 | ≥ 30 | GB/T 3854-2017 | |
| 3 | Gouge Resistance (50kg) | μm | 389 | ≤ 500 | SY/T 4113.1-2018 | |
| 4 | Abrasion Resistance (23°C ±2°C) | L/μm | 4.5 | ≥ 3 | SY/T 0315-2013 Annex J | |
| 5 | Resistance to 1° Bending (23°C ±2°C) | -- | Pass | No cracks. | SY/T 6854-2012 Annex C | |
| 6 | Tensile Strength (23°C ±2°C) | MPa | 44.8 | ≥ 40 | GB/T 1447-2005 | |
| 7 | Adhesion to PE (23°C) | MPa | 4 | ≥ 3.5 | SY/T 6854-2012 Annex A | |
| 8 | Adhesion to Epoxy Coating (23°C) | MPa | 9 | ≥ 7 | SY/T 6854-2012 Annex A | |
In accordance with different corrosive environments and specific requirements of pipeline construction projects, it is practically impossible to carry out repairs on pipelines constructed through directional drilling. Quality issues during the construction phase may lead to rapid punctures and leaks. Therefore, for traversing complex terrains, it is recommended to use a combination of 3PE anti-corrosion coating and modified epoxy fiberglass protective layer specifically designed for directional drilling.
Our company's epoxy fiberglass for pipeline crossing meets the requirements of the "Technical Specifications for External Coatings in Directional Drilling" as specified by China Petroleum Corporation. It significantly reduces the risk of damage to the 3PE anti-corrosion coating during the pipeline crossing process, ensuring compliance with the standard requirements for long-term safe operation of the pipeline.