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0102030405

China Suppliers Water Blocking Tape for Cable Insulation - Durable Factory Product for Moisture Protection

Our insulated water blocking tape is designed to effectively prevent water from infiltrating the interior of cables, safeguarding them against moisture damage. Manufactured in China, our product features two layers of durable non-woven fabric, with a specialized water blocking powder integrated between the layers, along with a carefully balanced blend of tackifiers and tear-resistant agents. This versatile tape is primarily used in the protective layers of high-voltage cables and the armor layers of aluminum corrugated pipes, making it an essential choice for cable filling applications. As a trusted supplier, our factory ensures the highest quality standards in producing water blocking solutions tailored for diverse industrial needs.

Product Detail

Product Description

Insulated waterproof tape for cables is a specially designed waterproof and moisture-proof material for cables and optical cables. It plays an important role in ensuring the safe operation and extending the service life of cables and optical cables. The following is a brief introduction to insulated waterproof tapes for cables:

1. Structure and Composition

The insulation waterproof tape for cables is usually composed of a strip-shaped substrate layer with tensile and temperature resistance properties, and a high rate water absorbing material layer uniformly attached to the substrate layer. The two layers can be combined through various methods such as bonding, coating, impregnation, etc. to form a whole. The substrate layer usually uses polymer materials such as polyester (PET) and polypropylene (PP), while the water absorbing material layer may include water absorbing resins such as polyacrylamide, polyacrylic acid ester, and polyacrylate.

2. Water blocking principle

When the cable or optical cable is damaged and causes moisture penetration, the water absorbing resin in the water stop will quickly absorb moisture and expand hundreds of times, forming a gel state to fill the cable core gap. This expansion effect effectively reduces the further infiltration of water and moisture into cables or optical cables, playing a good role in blocking water.

3. Technical features

High water absorption rate: Water absorbing resin can absorb a large amount of water in a short period of time and quickly expand to fill the gaps between cable cores.

Good water blocking effect: By absorbing water and expanding to form a barrier, it effectively prevents further infiltration of moisture and dampness.

Excellent electrical performance: Some waterproof tapes also have semiconductive properties, which can optimize the electrical structure of cables, reduce partial discharge and electric field distortion.

Good mechanical performance: It has sufficient tensile strength and tear strength, and can withstand the mechanical stress of cables during installation and operation.

Thermal stability performance: able to maintain stable electrical and physical properties at high temperatures, meeting the requirements for cable use in high-temperature environments.

4. Application Fields

Insulated waterproof tapes for cables are widely used in the manufacturing of power cables, communication cables, and optical cables. In power cables, it is usually used between the insulation shielding layer and the metal sheath to provide waterproofing, moisture insulation, and electrical connection. In communication cables and optical cables, it is used to prevent moisture from infiltrating and causing signal attenuation or interruption.

5. Precautions

Choose the appropriate waterproof tape: Select the appropriate waterproof tape material according to the specific requirements of the cable or optical cable, ensuring that its electrical, waterproof, and mechanical properties meet the requirements.

Strict control of process: In the manufacturing process of cables or optical cables, 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 waterproof performance tests on the produced cables or optical cables to ensure that the waterproof tape plays its due role in the cables or optical cables.

Parameters

Common Specification Table

Properties	Single-side water blocking tape					Double-side water blocking tape
Properties	15	20	25	30	35	20	25	30	35	40	45
Grammage (g/m²)	60±10	75±5	85±5	95±10	110±10	75±5	110±10	120±10	130±10	140±10	150±10
Thickness (mm)	0.15	0.2	0.25	0.3	0.35	0.2	0.25	0.3	0.35	0.4	0.45
Tensile strength (N/cm)	≥20	≥25	≥30	≥30	≥30	≥25	≥30	≥35	≥35	≥35	≥40
Elongation (%)	≥12	≥12	≥12	≥12	≥12	≥12	≥12	≥12	≥12	≥12	≥12
Moisture (%)	≤9	≤9	≤9	≤9	≤9	≤9	≤9	≤9	≤9	≤9	≤9
Expansion speed (mm/min)	≥6	≥8	≥8	≥10	≥10	≥6	≥8	≥10	≥10	≥12	≥12
Expansion height (mm/3min)	≥8	≥10	≥10	≥12	≥12	≥8	≥10	≥12	≥12	≥14	≥14
Long term stability (°C)	100	100	100	100	100	100	100	100	100	100	100
Short term stability (°C)	230	230	230	230	230	230	230	230	230	230	230
Application	Used on the surface of cable conductors and outside of insulation to provide insulation and water resistance.
Support customizing other specifications

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Frequently Asked Questions (FAQ)

Q1: What is the basic composition of insulated waterproof tape for cables?

A1: It is composed of a strip-shaped substrate layer (typically polymer materials like PET or PP) that offers tensile and temperature resistance, combined with a high-rate water-absorbing material layer (such as polyacrylamide or polyacrylate).

Q2: How does the water-blocking principle of the tape work?

A2: When moisture penetrates the cable, the water-absorbing resin in the tape rapidly absorbs the moisture and expands hundreds of times its size. This creates a gel barrier that fills gaps in the cable core, preventing further water infiltration.

Q3: What are the primary technical features of this waterproof tape?

A3: The tape features a high water absorption rate, excellent water blocking, outstanding electrical performance (including semiconductive options to optimize electrical structure), good mechanical tensile strength, and high thermal stability.

Q4: Where is cable insulated waterproof tape commonly applied?

A4: It is widely used in manufacturing power cables (between the shielding layer and metal sheath), communication cables, and optical cables to prevent moisture from causing signal attenuation or interruption.

Q5: What precautions should be taken during cable manufacturing and installation?

A5: You must choose the appropriate tape material based on cable specs, strictly control manufacturing process parameters like winding tension and overlap rates, and conduct rigorous electrical and waterproof performance tests.

Q6: Can the specifications of the waterproof tape be customized?

A6: Yes, in addition to standard specifications for single-side and double-side water blocking tapes, customization of other technical parameters and specifications is supported.