Water Blocking FRP Rod Manufacturers and
Suppliers in India

Polyrod is a specialist water blocking FRP rod manufacturer in India, producing water-swellable FRP/GRP rods engineered to prevent water ingress inside fiber optic cables. As water damage remains one of the leading causes of fiber signal loss and cable failure, our water blocking rods give cable manufacturers a proven, longitudinal water-blocking solution that also serves as a strength member.

Our water swellable FRP rods immobilize the cable core and fill voids at the block, preventing water from migrating along the cable toward splice points and joints. This makes Polyrod a reliable water blocking GRP rod supplier for any cable design that must resist water ingress beyond what the outer cable jacket alone can provide - including underground, duct, and direct-burial applications.

Key features:

Dual function: acts as both a central/peripheral strength member and a water-blocking element
Immobilizes the cable core and covers voids at the block
Prevents water flow toward splice joints, protecting long-term fiber performance
Available with multiple coating options depending on cable design and application
ROHS compliant (2011/65/EU & (EU) 2015/863) and REACH compliant ((EC) No.1907/2006)

Coated FRP rods in USA used for fiber optic cable raw material

Product Specification Table
Basic Properties	Water Blocking FRP
Tensile Strength	≥140kg/mmÂ²
Tensile Modulus	≥5000 kg/mmÂ²
Elongation	2.5-4.0%
Flexural Strength	≥70kg/mmÂ²
Flexural Modulus	5000 kg/mmÂ²
Minimum Bend Diameter/Thickness	25XD
Heat Stress	@ 80c for 24hrs
Water Absorption	≥2 g/meter (Diameter increase ≥0.2 mm)

Applications

Fiber optic cable manufacturers specify our water blocking FRP/GRP rods for outdoor, duct, aerial, and direct-burial cable designs where moisture protection at the core is critical. As a bulk fiber optic cable strength member supplier, we support both prototype quantities for cable qualification and large-scale recurring orders for production runs.

FAQs

Frequently Asked Questions

1. What does a water blocking FRP rod do?

A water blocking FRP rod combines two functions in one component: it acts as a strength member for the cable core and, being water-swellable, it seals voids around itself to prevent water from travelling longitudinally along the cable toward splice points.

2. When should I use a water blocking rod instead of a standard FRP/GRP rod?

Water blocking rods are recommended for outdoor, direct-burial, duct, or aerial cable designs where moisture ingress is a risk and the cable jacket alone doesn't provide sufficient protection against water migration.

3. How much does a water blocking FRP rod swell on contact with water?

Our water blocking FRP rods are engineered for a minimum water absorption of â‰¥2 g/meter with a diameter increase of â‰¥0.2 mm, sufficient to seal the surrounding void and block water flow.

4. Can water blocking FRP rods be supplied with different coatings?

Yes, we offer multiple coating options for our water blocking rods depending on the cable design and adhesion requirements of the outer jacket material.

5. Are water swellable FRP rods available for bulk/OEM orders?

Yes, we supply water swellable FRP/GRP rods for both qualification-batch orders and large-scale bulk/OEM production runs for cable manufacturers in India and abroad.