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China Suppliers and Factory of Semi-Conductive Cushion Water Blocking Tape for High-Voltage Cables
Product Description
Semi conductive buffering and water blocking tape for cables is a cable auxiliary material that integrates semiconductor properties, buffering effect, and water blocking function. It is mainly used in medium, high, and ultra-high voltage power cables, as well as other control, communication, signal, and instrumentation cables with shielding requirements, to improve the overall performance and service life of the cables. The following is a detailed introduction to the use of semiconducting buffer water blocking tape for cables:
■1. Structure and Composition
The semi conductive buffer water blocking tape for cables is usually composed of multiple layers, mainly including a semi conductive layer, a buffer layer, and a water blocking layer. Among them, the semiconducting layer is composed of semiconducting materials with good conductivity, which can reduce the accumulation of charges on the insulation surface of the cable and reduce the possibility of partial discharge; The buffer layer provides a certain mechanical buffering effect to protect the cable from external impact; The water blocking layer is made of water absorbing and expanding materials, which can quickly expand when in contact with water, preventing moisture from further penetrating into the interior of the cable.
■2. Technical features
- Semi conductive performance: Semi conductive buffer water barriers have low electrical resistivity and can serve as electrical connections in cables, optimizing the electrical structure of cables and reducing electric field distortion and partial discharge.
- Buffer function: The design of the buffer layer enables the waterproof tape to provide a certain degree of buffer protection when the cable is subjected to external impact, reducing the risk of cable damage.
- Water blocking function: The water blocking layer is made of water absorbing and expanding materials, which can quickly 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.
■3. Application method
Semi conductive buffer water blocking tape for cables is usually used between the insulation shielding layer and the metal sheath of the cable, playing a role in electrical connection, buffer protection, and water blocking. In the cable manufacturing process, the waterproof tape will be wrapped around the cable according to the specified process requirements, forming a continuous semi conductive buffering waterproof layer.
■4. Performance indicators
The performance indicators of semiconducting buffer water barriers 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.
■5. Precautions
- 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.
Parameters
| Properties | 15 | 20 | 30 | Test method |
|---|---|---|---|---|
| Thickness (mm) | 1.5±0.3 | 2.0±0.3 | 3.0±0.3 | ISO 9073-2 |
| Grammage (g/m²) | 260±40 | 280±40 | 320±40 | ISO 9073-1 |
| Tensile strength (N/cm) | ≥40 | ≥40 | ≥40 | ISO 9073-3 |
| Elongation (%) | ≥12 | ≥12 | ≥12 | ISO 9073-3 |
| Surface resistance (Ω) | ≤1000 | ≤1000 | ≤1000 | DIN IEC 167 |
| Volume resistance (Ω.cm) | ≤1X10⁵ | ≤1X10⁵ | ≤1X10⁵ | DIN 54345 |
| Expansion rate (mm/min) | ≥8 | ≥8 | ≥10 | Q/TF 2010 |
| Expansion height (mm/3min) | ≥10 | ≥12 | ≥14 | Q/TF 2010 |
| Short term stability (℃) | 230 | 230 | 230 | Q/TF 2010 |
| Long term stability (℃) | 90 | 90 | 90 | IEC 216 |
| Moisture (%) | ≤9 | ≤9 | ≤9 | ISO 287 |
| Application | Used for buffering layer and water blocking inside the metal sheath of ultra-high voltage cables. | |||
| Support customizing other specifications | ||||
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Frequently Asked Questions
It integrates three main functions: semiconductor properties (reducing charge accumulation and partial discharge), buffering protection (safeguarding cables from mechanical impacts), and water blocking (expanding upon contact with water to prevent moisture penetration).
It is wrapped between the insulation shielding layer and the metal sheath of medium, high, and ultra-high voltage cables to ensure stable electrical connections and mechanical protection.
The tape is composed of multiple layers, primarily including a highly conductive semi-conductive layer, a mechanical buffer layer, and a water-absorbing expand-on-contact water blocking layer.
Yes, while standard specifications like thicknesses of 1.5mm, 2.0mm, and 3.0mm are readily available, customizing other specifications is supported to meet specific cable design requirements.
It is critical to choose the correct tape specifications matching the cable requirements, strictly control winding tension and overlap rates to ensure uniformity, and conduct rigorous testing on the finished cable's electrical and water-blocking properties.