Water Blocking Yarn


Water Blocking Yarn

Water blocking yarn has high water absorption and tensile strength, no acid and alkali. Widely used in optical cable to bundle, tight and block water.

  • PAYMENT TERMS : T/T, L/C, D/P, etc.
  • DELIVERY TIME : 10 days
  • CONTAINER LOADING: 8t / 20GP, 16t / 40GP
  • SHIPPING: By sea
  • PORT OF LOADING: Shanghai, China
  • HS CODE : 5402200010
  • STORAGE : 12 months
  • Product Detail

    Product Introduction

    Water blocking yarn is a high-tech water blocking product made mainly from polyester industrial filament compounded with cross-linked polyacrylic intumescent to restrict the entry of water into the interior of optic cable or cable. Water blocking yarn can be widely used in various processing layers inside the optical cable and cable, and plays the role of bundling, tightening and water blocking.

    Water blocking yarn is a water-swelling yarn with low price. When used in optical cable, they are easy to splice and eliminate the need for cleaning grease in optical fiber splices.

    The mechanism of the water blocking yarn is that when the water penetrating into the cable and contact with the water-absorbing resin in the water blocking yarn, the water-absorbing resin rapidly absorbs water and swells, filling the gap between the cable and the optical cable, thus preventing further longitudinal and radial flow of water in the cable or optical cable to achieve the purpose of water blocking.


    We can provide high-quality water-blocking yarn with the following characteristics:
    1) Even thickness of water-blocking yarn, even and non-dislodging water-absorbing resin on the yarn, no bonding between layers.
    2) With a special winding machine, the rolled water-blocking yarn is evenly arranged, tight and non-loose.
    3) High water absorption, high tensile strength, acid and alkali free, non corrosive.
    4) With good swelling rate and swelling rate, the water blocking yarn can reach a certain swelling ratio in a short period of time.
    5) Good compatibility with other materials in optical cable and cable.


    Mainly used inside optical cable and cable interior, it plays the role of bundling cable core and blocking water.

    Technical Parameters

    Item Technical Parameters
    Denier(D) 9000 6000 4500 3000 2000 1800 1500
    Linear density(m/kg) 1000 1500 2000 3000 4500 5000 6000
    Tensile strength(N) ≥250 ≥200 ≥150 ≥100 ≥70 ≥60 ≥50
    Breaking Elongation(%) ≥12 ≥12 ≥12 ≥12 ≥12 ≥12 ≥12
    Swelling speed(ml/g/min) ≥45 ≥50 ≥55 ≥60 ≥60 ≥60 ≥60
    Swelling capacity(ml/g) ≥50 ≥55 ≥55 ≥65 ≥65 ≥65 ≥65
    Water contain(%) ≤9 ≤9 ≤9 ≤9 ≤9 ≤9 ≤9
    Note: More specifications, please contact our sales staff.


    The water blocking yarn is packaged in roll, and the specifications are as follows:

    Inner diameter of pipe core(mm) Pipe core height(mm) Outer diameter of yarn(mm) Yarn weight(kg) Core material
    95 170、220 200~250 4~5 Paper

    The rolled water blocking yarn are wrapped in plastic bags and vacuum. Several rolls of water blocking yarns are packed into moisture-proof plastic bags, and then concentrated into the carton. The water blocking yarn is placed vertically in the carton, and the outer end of the yarn is firmly pasted. Several boxes of water blocking yarn are fixed on the wooden pallet, and the outside is wrapped with wrapping film.

    packing (1)
    packing (2)


    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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