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WBA — Water-Blocking Para-Aramid Yarn

Mechanical reinforcement combined with dry water blocking. WBA is a water-swellable para-aramid yarn serving as dielectric strength member and longitudinal water block at the same time — replacing water-blocking tapes and gels in dry cable constructions.

WBA water-blocking para-aramid yarn bobbins
≥ 270 / 530 NBreaking strength (1500 / 3000)
≥ 112 GPaTensile modulus
≥ 8.0 g/gAbsorption capacity
100% dielectricNon-metallic cable designs

Product description

WBA combines axial load bearing with swellable water blocking in a single dielectric yarn. It simplifies dry cable constructions by replacing separate water-blocking tapes and gels while continuing to carry tensile load as a strength member.

Key features

High tensile strength · outstanding flexibility · impact and fatigue resistance · excellent water-absorbing ability.

Typical designs

Dry-core optical cable constructions requiring longitudinal water-blocking performance together with a non-metallic strength member. Final water-blocking performance shall be validated in the complete cable construction.

Specifications

PropertyUnitWBA1500 (spec. / typ.)WBA3000 (spec. / typ.)
Linear densitydenier1670–1870 / 17703250–3470 / 3350
Breaking strengthN≥ 270 / 310≥ 530 / 600
Elongation at break%2.1–2.7 / 2.42.0–3.0 / 2.5
Tensile modulusGPa≥ 112 / 115≥ 112 / 115
LASE @ 0.3% elongationN≥ 26 / 34≥ 50 / 60
LASE @ 0.5% elongationN≥ 51 / 60—
LASE @ 1.0% elongationN≥ 103 / 120≥ 100 / 120
Absorption capacityg/g≥ 8.0 / 15≥ 8.0 / 15

Test methods: ASTM D1907 (linear density), ASTM D885 (tensile and LASE), IEC 60794-1-2 (absorption capacity). Conditions: 21 ± 1 °C, 65 ± 2% RH. WBA does not by itself define the water resistance of a finished cable — final water-blocking performance shall be validated in the complete cable construction.

Packaging information

PackageSpec IDLengthTraverseMax OD
Supply tube SF94 × 21694 mm216 mm185 mm270 mm
Supply tube SF94 × 29094 mm290 mm250 mm270 mm

Sampling on standard tubes for stranding trials; other package forms available on request under OEM terms.

Supply documentation

Request WBA quotation or samples