1kV Cable Sealing: Why Choose EPDM Cold Shrink Tubes?
Time: 2026-01-30 14:53:28     Copyfrom: SuZhou Volsun Electronics Technology Co.,Ltd.

In 1kV and below power and communication cable sealing applications, VOLSUN EPDM cold shrink tubes provide a more reliable solution. They install without heat, deliver consistent radial pressure over time, and maintain long term sealing performance in harsh outdoor and underground environments, effectively reducing failure risks caused by aging and gaps.

What is the core challenge in 1kV cable sealing ?

The primary requirement is reliable waterproof sealing. Most medium  and low voltage cable failures stem from water ingress, aging, and seal degradation at terminations and splices. Especially in wet outdoor and underground conditions, sealing reliability directly determines long term system safety.

How does VOLSUN EPDM cold shrink tubing achieve effective sealing?

VOLSUN EPDM cold shrink tubes use a pre expanded design. They are factory expanded onto a removable support core. During installation, simply extract the core, and the rubber contracts naturally due to its inherent elasticity, creating continuous, uniform radial pressure around the cable. The entire process requires no heat, no flame, and no special tools, enabling a secure seal in about one minute.

Comparison with common alternatives

Heat shrink tubes: Require heating, involve safety hazards, and tend to age and become brittle outdoors. VOLSUN EPDM cold shrink tubes install without heat and use premium EPDM rubber with excellent UV and weather resistance, delivering long service life comparable to the cable itself.

Silicone cold shrink tubes: Offer good flexibility but limited puncture and abrasion resistance. VOLSUN EPDM cold shrink tubes provide superior resistance to punctures, wear, acids, and alkalis. In buried and humid environments, they expand and contract in sync with the cable, preventing gap formation and ensuring long term integrity.

Unique advantage: Even under dynamic conditions such as swinging overhead cables, VOLSUN EPDM cold shrink tubes maintain stable sealing performance, ensuring reliability in extreme operating environments.

What key technical specifications demonstrate its performance capabilities?

Technical parameters reflect the product’s inherent strength. VOLSUN EPDM cold shrink tubes feature a hardness of 45 Shore A for optimal balance of elasticity and strength, a tensile strength of ≥8.6 MPa, an elongation at break of ≥600%, and a dielectric strength of 15 kV/mm. These properties ensure resistance to physical wear while providing robust electrical insulation.

What are the typical engineering applications?

VOLSUN EPDM cold shrink tubes are widely used for 1kV and below cable sealing in indoor cabinets, outdoor overhead installations, underground burial, and communication base station construction. They deliver consistent sealing performance across diverse environments. Installation requires no hot melt adhesive or reinforcing tapes—simply remove the support core and rely on the material’s radial retraction to achieve long lasting cable protection.

From an engineering standpoint, reliable cable sealing depends not on complex installation procedures, but on whether the material can maintain stable sealing pressure over time. With high quality EPDM, scientific design, and proven performance, VOLSUN EPDM cold shrink tubes directly address the key pain points of 1kV cable sealing, making them the preferred choice for high reliability solutions.