Procurement Guide for Water Blocking Tape

(Disclaimer: Some of the information in this article is sourced from the internet. Please carefully identify and use it.)

Product Overview: Waterproof tape is a composite material made of double-layer non-woven fabric sandwiching waterproof powder. It isolates moisture from entering the interior of the cable through the water expansion characteristics of the waterproof powder (expansion rate ≥ 300%), and has both tear resistance and corrosion resistance. It is specifically used for waterproof protection of high-voltage cable protective layers and aluminum armor layers.

Key performance indicators (for reference only, not used as procurement standards)

• Water resistance performance: Passed the IEC 60502-2 water tightness test (no leakage after 72 hours).
• Expansion rate: The volume expands by ≥ 200% within 30 seconds of encountering water.
• Tensile strength: Longitudinal ≥ 50N/cm, transverse ≥ 30N/cm (GB/T 3923.1 standard).

Application scenarios

Suitable for water blocking of high-voltage power cables (such as YJV22), submarine cables (HVDC), and control cables (KVVP), especially suitable for humid, buried, or underwater environments.

Procurement precautions

• Distribution detection of water blocking powder: The supplier is required to provide a test report on the uniform distribution of water blocking powder.
• Long term stability: Conduct 85 ℃/85% humidity aging test (1000 hours), and the expansion rate should still be ≥ 250%.
• Cost control: The quality of water absorbing materials directly affects their water blocking effect, so avoid choosing low-priced products without testing reports.

Frequently asked questions

Q: How to avoid the water blocking powder from falling off during installation?

A: Choose products with adhesive peel strength ≥ 3N/cm and maintain tension of 8-12N during wrapping.

If you need to purchase, you can choose Wuxi Henglong Cable Material Co., Ltd., a well-known manufacturer in the Chinese Cable Materials industry.