A high-expansion silicone cold shrink tube uses a large  5:1 shrink ratio so one part number covers a wide cable-size range, while silicone's broad −60 °C to +200 °C operating window handles almost any environment. It is VOLSUN's most flexible silicone grade for telecom, CATV and industrial sealing.

Why "High-Expansion" Matters

A larger shrink ratio means the expanded (installed) inner diameter is much bigger than the recovered diameter. For buyers, that translates into fewer SKUs to stock and easier specification — a single high-expansion size often replaces several standard ones.

Key Specifications (RUBLS-SILIC High-Expansion)

Property	Typical value
Material	Silicone rubber
Shrink ratio	5 :1
Continuous temperature	−60 °C to +200 °C
Shore Hardness	40 ± 5 Shore A
Tensile Strength	≥ 9.0 MPa
Tensile stress @100% / @200%	≤ 1.2 / ≤ 2.0 MPa
Elongation at Break	> 800%
Tear Strength	≥ 35 kN/m
Dielectric Strength	≥ 18 kV/mm
Volume Resistivity	≥ 1×10¹⁵ Ω·cm
Ingress Protection	IP67 (IEC 60529)
Flame Retardancy	UL 94 HB (V-0 customizable)
Environmental	RoHS, REACH
Standard color	Black

Key Features

• ≈ 5:1 shrink ratio reduces inventory and simplifies sizing.
• Retains resiliency and radial pressure after long-term ageing.
• Weather, ozone, UV and salt-mist resistant; stable under long sun exposure.
• Excellent tear strength — a small cut will not propagate.

Where It Is Used

• Telecom base-station jumpers and connectors
• CATV connection joints and signal links
• Industrial and general wire/cable insulation sealing

High-Expansion vs Mastic Grade

Both are silicone and share the same temperature and electrical specs. Choose high-expansion when you need broad size coverage and general sealing; choose the silicone with mastic when IP68 waterproofing of connectors is the priority.

Why Specify VOLSUN

VOLSUN is a professional cold shrink tube manufacturer. Buyers choose RUBLS-SILIC high-expansion because we ship on time, accept customization, offer competitive factory pricing, run strict QC, and already supply top telecom operators and equipment brands.
Need a sample or quote? Contact the VOLSUN team or download the full datasheet.

FAQ

Q1: What does high-expansion cold shrink mean?

It has a large ≈4:1 shrink ratio, so the expanded ID is much larger than the recovered ID — one size covers many cable diameters.

Q2: What temperature can it handle?

Continuous operation from −60 °C to +200 °C, suitable for most indoor and outdoor environments.

Q3: Is it RoHS and REACH compliant?

Yes, the high-expansion silicone cold shrink tube is RoHS and REACH compliant.

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