Water Blocking Tape for Communication Cables

Product Features
Fast Water‑induced Swelling for Effective Water Blocking
Embedded SAP super absorbent polymer swells rapidly upon contact with water and forms a gel barrier. It blocks longitudinal water penetration and prevents water spreading along cable gaps.
High Flexibility for Cable Manufacturing
Flexible non‑woven base material, lightweight and tough. Suitable for lapping and longitudinal wrapping. Works well on high‑speed cable production lines without breaking or powder shedding.
Long‑term Stability & Wide Environmental Compatibility
Good resistance to temperature variation and aging. Maintains reliable performance in underground, damp and hot‑humid conditions, no hydrolysis failure over service life.
Non‑corrosive to Cable Components
Corrosion‑free formulation. Safe for optical fibers, conductors and internal cable parts, no negative impact on signal transmission.
Easy Processing & Broad Compatibility
Applied by wrapping around cable cores or interleaving between cable layers. Compatible with diverse optical and power cable manufacturing workflows.

Instructions for Use
Wrap or longitudinally apply water‑blocking tape around cable core, fiber bundle or intermediate cable layers.
Proceed with sheath extrusion process.
Once water intrudes into the cable, the tape swells into gel to stop longitudinal water migration.
Warning: Store in dry conditions. Avoid prolonged exposure to high‑humidity atmosphere.
Main Applications
Longitudinal water blocking for telecom optical fiber cables
Waterproofing for power cables, control cables and hybrid optical‑power cables
Water protection for direct‑buried and duct‑installed cables
Submarine cables, tunnel and railway transit communication cables
Water‑blocking protection for optical cable joint assemblies