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China Suppliers Semi-Conductive Cushion Water Blocking Tape for High-Voltage Cable Factory
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: Low electrical resistivity, serves as electrical connections, optimizing electrical structure and reducing electric field distortion and partial discharge.
- Buffer function: Provides buffer protection when the cable is subjected to external impact, reducing the risk of damage.
- Water blocking function: Made of water absorbing and expanding materials that expand upon contact with water, forming a waterproof barrier.
- High mechanical strength: High tensile strength and elongation at break, withstanding mechanical stress during installation and operation.
- Good heat resistance: Excellent heat resistance, maintaining 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
Common Specification Table
| 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
What is the primary function of semi-conductive buffering and water blocking tape in cables?
It is an auxiliary cable material that integrates semiconductor properties, mechanical buffering, and water blocking. It is wrapped inside the cable to optimize the electrical field, absorb mechanical impacts, and expand upon contact with water to prevent moisture penetration.
How does the water-blocking layer work to protect the cable?
The water-blocking layer is made of highly water-absorbent and expanding materials. When moisture penetrates the cable sheath, this layer absorbs the water and quickly expands in volume, creating a physical waterproof barrier that stops water from spreading further inside the cable.
Where is this buffering and water blocking tape applied inside the cable?
It is typically wrapped between the cable's insulation shielding layer and the outer metal sheath. This positioning ensures effective electrical contact, buffering against external physical stress, and immediate moisture defense.
What are the key technical features of this tape?
Its main features include low electrical resistivity for stabilizing electric fields, high mechanical strength (tensile strength ≥ 40 N/cm), rapid expansion rate, and excellent heat resistance (up to 230°C short-term stability).
What precautions should be taken during cable manufacturing when using this tape?
Manufacturers must select the correct tape specifications matching the cable design, strictly control wrapping parameters like tension and overlap rate to ensure uniformity, and conduct rigorous electrical and water-blocking tests on the finished cables.