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Cable Semi-conductive Non-woven Tape

0102030405

China Suppliers Factory Semi-Conductive Water Blocking Tape for Power Cables - Non-Corrosive and Durable

Introducing our state-of-the-art semi-conductive water blocking tape, expertly crafted in China by leading suppliers in the industry. This innovative tape is made from high-quality semiconductor materials, electrode silver paste, and a reliable substrate, ensuring exceptional performance. It is designed to adapt its resistance based on changes in electric field strength, providing effective water resistance between various components of power cables. Our product is non-corrosive, making it an ideal choice for ensuring the longevity and safety of your electrical systems. Trust our factory to deliver top-notch solutions for your water blocking needs

Product Detail

Product Description

Semi conductive water hose for cables is an auxiliary material specially designed for cables (especially medium, high, and ultra-high voltage power cables and other control, communication, signal, and instrumentation cables with shielding requirements). It combines semi conductive performance and water blocking function, which is of greater significance for the safe operation and extended service life of cables. The following is a detailed introduction to the use of semiconductor resistance water hoses for cables:

1. Structure and Composition

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.

2. Technical features

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.

3. Application Fields

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.

4. Performance indicators

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.

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.

Semi-conductive resistance hose - Introductionl26

Parameters

Common Specification Table

Properties	Double-layer			Single-layer
Properties	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

Detailed image

Frequently Asked Questions (FAQ)

What is the primary function of a semi conductive water hose/tape for cables?

It is designed to protect medium, high, and ultra-high voltage power cables. It combines semi conductive shielding performance (reducing electric field distortion and partial discharges) with a rapid water-blocking expansion function to prevent moisture ingress.

How does the water-blocking mechanism work when exposed to moisture?

The tape contains an intermediate layer of absorbent resin or expansion-resistant water powder. Upon contact with water, this material rapidly swells to form a physical waterproof barrier, stopping water from migrating down the cable core.

What are the typical technical parameters used to evaluate its quality?

Quality is evaluated based on parameters such as thickness, grammage, tensile strength, elongation, expansion rate and height, surface/volume resistance, thermal stability (short-term and long-term), and moisture content.

In what applications and industries is this product utilized?

It is widely applied in power transmission, telecommunications, transit/transportation, and construction projects. It is wrapped during manufacturing around shielding layers in power and signal cables.

What precautions should be observed during the cable manufacturing process?

Manufacturers must select the correct tape specifications matching the cable design, strictly control wrapping tension and overlap rates to ensure layer continuity, and conduct strict post-production electrical and water-blocking tests.

Are custom specifications available for these semi conductive tapes?

Yes, in addition to standard double-layer and single-layer specifications (such as thicknesses of 0.3mm, 0.4mm, and 0.5mm), customized specifications are supported to meet specific cable design requirements.