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China Suppliers Factory Semi-Conductive Water Blocking Tape for Power Cables - Non-Corrosive and Resistance Adjustable
The semi conductive water strip for cables is usually composed of two layers of non-woven fabric strips with an intermediate layer of expansion resistant water powder (or absorbent resin), and some products are also soaked and dried to form a semi conductive adhesive. This structure enables the waterproof tape to have both the functions of water absorption and expansion, water resistance, and semi conductivity, which can effectively reduce the accumulation of charges on the insulation surface of the cable and reduce the possibility of partial discharge.
Semi conductive performance: The water barrier tape has a low electrical resistivity and can serve as an electrical connection in the cable, helping to optimize the electrical structure of the cable and reduce electric field distortion and partial discharge.
Water blocking performance: Water absorbing resin can rapidly expand upon contact with water, forming a waterproof barrier that effectively prevents moisture from further penetrating into the interior of the cable.
High mechanical strength: Waterproof tapes usually have high tensile strength and elongation at break, which can withstand the mechanical stress of cables during installation and operation.
Good heat resistance: The product has excellent heat resistance and can maintain stable electrical and physical properties at high temperatures.
Easy to process: The waterproof tape is easy to wrap and longitudinally wrap, and can be conveniently applied in the manufacturing process of various cables.
Semi conductive water hoses for cables are widely used in the manufacturing of medium, high, and ultra-high voltage power cables and other cables with shielding requirements in the fields of power, communication, transportation, and construction. It can not only improve the waterproof performance of cables, but also optimize the electrical structure of cables, reduce cable failure rates, and extend cable service life.
The performance indicators of semi conductive water hoses for cables usually include thickness, unit weight, tensile strength, elongation, expansion rate, expansion height, surface resistance, volume resistance, instantaneous stability, long-term stability, and moisture content. These indicators are of great significance for evaluating the performance and effectiveness of water barriers.
Choose the appropriate waterproof tape: Select the appropriate waterproof tape material and specifications according to the specific requirements of the cable, ensuring that its electrical, waterproof, and mechanical properties meet the requirements.
Strict control of process: In the cable manufacturing process, it is necessary to strictly control the process parameters such as the winding tension and overlap rate of the waterproof layer to ensure the uniformity and continuity of the waterproof layer.
Quality inspection: Conduct strict electrical and water blocking performance tests on the manufactured cables to ensure that the water blocking tape plays its due role in the cables.
| Properties | Double-layer | Single-layer | ||||
|---|---|---|---|---|---|---|
| 30 | 40 | 50 | 30 | 40 | 50 | |
| Thickness | 0.3±0.03 | 0.4±0.03 | 0.5±0.03 | 0.3±0.03 | 0.4±0.03 | 0.5±0.03 |
| Grammage (g/m²) | 130±10 | 140±10 | 170±10 | 120±10 | 110±10 | 170±10 |
| Tensile strength (N/cm) | ≥30 | ≥30 | ≥40 | ≥30 | ≥30 | ≥40 |
| Elongation (%) | ≥12 | ≥12 | ≥12 | ≥12 | ≥12 | ≥12 |
| Surface resistance (Ω) | ≤1000 | ≤1000 | ≤1000 | ≤1000 | ≤1000 | ≤1000 |
| Volume Resistance (Ω.cm) | ≤1X10⁵ | ≤1X10⁵ | ≤1X10⁵ | ≤1X10⁵ | ≤1X10⁵ | ≤1X10⁵ |
| Expansion rate (mm/min) | ≥8 | ≥8 | ≥10 | ≥6 | ≥8 | ≥10 |
| Expansion height (mm/3min) | ≥12 | ≥12 | ≥14 | ≥8 | ≥10 | ≥14 |
| Short term stability (℃) | 230 | 230 | 230 | 230 | 230 | 230 |
| Long term stability (℃) | 90 | 90 | 90 | 90 | 90 | 90 |
| Moisture (%) | ≤9 | ≤9 | ≤9 | ≤9 | ≤9 | ≤9 |
| Application | Used for water blocking between various components of power cables, non corrosive. Due to the absence of a cover cloth barrier, the water blocking performance is better. | |||||
| Support customizing other specifications | ||||||
