Semi-conductive Water Blocking Tape

Semi-conductive Water Blocking Tape

Semi-conductive water blocking tape has fast expansion speed, high expansion height and high water resistance rate, and is mainly used in power cables to prevent water from penetrating and improve electric field distribution.

PORT OF LOADING Shanghai, China
HS CODE 5603131000
STORAGE 12 months

Product Introduction

Semi-conductive water blocking tape (or water block tape) is a modern high-tech water-blocking material with semi-conductive water-absorbing and expansion function (swelling tape), which is composed of semi-conductive polyester fiber non-woven fabric and high-speed expansion water-absorbing resin.

Among them, the semi-conductive base layer is manufactured by evenly distributing the semi-conductive compound on the base cloth that is relatively flat, has strong temperature resistance and high strength; the semi-conductive water-blocking material uses powdery polymer water-absorbing material and conductive carbon black. The water-absorbing material is attached to the base fabric by padding or coating.

The semi-conductive water blocking tape has the function of water-absorbing and expansion and improving the electric field distribution in the cable, and is widely used in power cables of various voltage levels.

We can provide single-sided/double-sided semi-conductive water blocking tape. The single-sided semi-conductive water block tape is composed of a single layer of semi-conductive polyester fiber non-woven fabric and high-speed expansion water-absorbing resin; the double-sided semi-conductive water blocking tape is composed of semi-conductive polyester fiber non-woven fabric, high-speed expansion water-absorbing resin and semi-conductive polyester fiber non-woven fabric in turn. The single-sided semi-conductive water block tape has better water blocking performance because it has no base cloth to block.

The semi-conductive water blocking tape we provided has the following characteristics:
1) The surface is flat, without wrinkles.
2) The fiber is evenly distributed, the water blocking powder and the base tape are firmly bonded, without delamination and powder removal.
3) High mechanical strength, easy for wrapping and longitudinal wrapping processing.
4) Strong hygroscopicity, high expansion height, fast expansion rate, and good gel stability.
5) Small surface resistance and volume resistivity, which can effectively weaken the electric field strength
6) Good heat resistance, high instantaneous temperature resistance, cable can maintain stable performance under instantaneous high temperature.
7) High chemical stability, no corrosive components, resistant to bacterial and fungal erosion.


Mainly used in power cables of various voltage levels to block water and improve electric field distribution.



Technical Parameters

Item Technical Parameters
Single-sided semi-conductive water blocking tape Double-sided semi-conductive water blocking tape
Nominal Thickness  (mm) 0.3 0.4 0.5 0.3 0.4 0.5
Tensile strength (N/cm) ≥30 ≥30 ≥40 ≥30 ≥30 ≥40
Breaking elongation (%) ≥10 ≥10 ≥10 ≥10 ≥10 ≥10
Surface resistance (Ω) ≤1500 ≤1500 ≤1500 ≤1500 ≤1500 ≤1500
Volume resistance (Ω·cm) ≤1×105 ≤1×105 ≤1×105 ≤1×105 ≤1×105 ≤1×105
Expansion speed (mm/min) ≥6 ≥8 ≥10 ≥8 ≥8 ≥10
Expansion height (mm/5min) ≥8 ≥10 ≥14 ≥10 ≥10 ≥14
Water ratio (%) ≤9 ≤9 ≤9 ≤9 ≤9 ≤9
Thermal stability
a) Long-term temperature resistance(90℃,24h)
Expansion height(mm)
≥Initial value
b) Instantaneous high temperature(230℃,20s)
Expansion height(mm)
≥Initial value
Note: More specifications, please contact our sales staff.



Each pad of semi-conductive water blocking tape is packaged in a moisture-proof film bag separately, and multiple pads are wrapped in a large moisture-proof film bag, then packed into a carton, and 20 cartons are placed in a pallet.
Package size: 1.12m*1.12m*2.05m
Net weight per pallet: about 780kg


1) The product shall be kept in a clean, dry and ventilated warehouse.
2) The product should not be stacked together with flammable products or strong oxidizing agents and should not be close to fire sources.
3) The product should avoid direct sunlight and rain.
4) The product should be packed completely to avoid moisture and pollution.
5) The product shall be protected from heavy pressure and other mechanical damage during storage.
6) The storage period of the product at ordinary temperature is 6 months from the date of production. More than 6 months storage period, the product should be re-examined and only used after passing the inspection.


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