Shanghai Gengyun Industrial Co., Ltd
Water-Blocking Yarn Technology: Core Material of the Dry Cable Revolution
Water-Blocking Yarn, as a Dry Water-Blocking Material based on Superabsorbent Polymers (SAP), is driving a paradigm shift in optical cable water-blocking technology from passive filling to active protection. This Water Swellable Yarn can expand hundreds of times within seconds upon contact with water, forming a dense gel that effectively prevents longitudinal moisture penetration within the cable core. Its performance meets international standards such as IEC 60794-1-2-F1.
Compared to traditional Optical Fiber Cable Filling Compound, water-blocking yarn technology offers multiple advantages: its solid-state nature avoids the temperature sensitivity and cleanliness issues of grease, increasing splicing operation efficiency by over 40%; the material itself complies with RoHS environmental directives, making it suitable for sensitive scenarios like drinking water pipes; in terms of structural compatibility, it can be integrated with cable core elements like loose tubes and strength members through various methods such as longitudinal placement or helical wrapping, making it especially suitable for miniaturized, high-density All-Dry Optical Cable designs.
This technology is now widely used in dry structures such as drop cables for access networks and indoor/outdoor micro cables, and plays a key role in specialized applications like armor layer gap protection in submarine cables and oil/gas pipeline monitoring cables. As an important alternative to Cable Water-Blocking Tape, water-blocking yarn demonstrates better filling uniformity in complex cable core structures. With the increasing demands for cable miniaturization and splicing efficiency driven by 5G high-density deployment, water-blocking yarn technology is becoming a core technical enabler for achieving high-reliability, easy-to-install cable designs.
picture1：Aramid Water Blocking Yarn
picture2：Aramid Water Blocking Yarn indoor & outdoor
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