Cold Shrink Tubing – Silicone
Cold Shrink Tubing in silicone rubber, factory-expanded on a removable core, seals low-voltage cable joints and terminal lugs up to 1.1 kV without heat or tools.
- ANSI C119.1
- ASTM D-412
- ASTM D-624
Choose a size
Selection Chart
- Ds (min.)
- Minimum internal diameter as supplied
- Df (max.)
- Maximum internal diameter after free recovery
- Lf
- Length after free recovery
- Tf (±10%)
- Wall thickness after free recovery
- Application range
- Cable or connector outside diameter the tube fits
| Code No. | Ds(min.) | Df(max.) | Lf(max.) | Tf(±10%) | Application Range |
|---|---|---|---|---|---|
| GCTS 20/7 | 20 | 7 | 500 | 2.1 | 8 - 15 |
| GCTS 25/9 | 25 | 9 | 500 | 2.1 | 10 - 20 |
| GCTS 35/11 | 35 | 11 | 500 | 2.1 | 12 - 30 |
| GCTS 40/14 | 40 | 14 | 500 | 2.1 | 13 - 35 |
| GCTS 45/16 | 45 | 16 | 500 | 2.1 | 18 - 38 |
| GCTS 53/20 | 53 | 20 | 500 | 2.1 | 22 - 46 |
| GCTS 65/24 | 65 | 24 | 500 | 3.0 | 26 - 53 |
| GCTS 70/30 | 70 | 30 | 500 | 3.0 | 28 - 63 |
| GCTS 80/30 | 80 | 30 | 500 | 3.0 | 28 - 72 |
D: diameter · s: as supplied · f: after free recovery. Source: GALA Cold Shrink Silicone Tubing catalogue sheet, Issue 1, March 2026.
Material properties
Technical Specification
| Properties | Test Methods | Typical Value |
|---|---|---|
| Colour | Visual | Grey / Black |
| Tensile Strength | ASTM D-412 | 6.0 MPa (min) |
| Ultimate Elongation | ASTM D-412 | 400% (min) |
| Tear Strength | ASTM D-624 | 25.0 kN/m (min) |
| Volume Resistivity | ASTM D-257 | 1 x 10¹² Ohm.cm (min.) |
| Fungus Resistance | ASTM G-21 | 28 days exposure, no growth |
| Hardness | ASTM D2240 | 40 ± 10 Shore A |
| Dielectric Strength | ASTM D149 | 18.0 kV/mm (min) |
Source: GALA Cold Shrink Silicone Tubing catalogue sheet, Issue 1, March 2026.
Dimensions & Drawings
Open-ended, tubular silicone sleeves, factory expanded and assembled onto a removable core. Position the tube over the connection or terminal lug, remove the core, and the tube shrinks to form a water-resistant seal.
Made from silicone, which does not contain chloride or sulfur. Seven diameter sizes cover copper and aluminium conductor up to 1000 sq.mm at 1.1 kV.
Covered on this page
- Cold Shrink Tubing Silicon
Features & Benefits
- Dielectric strength 18.0 kV/mm min. (ASTM D149)
- Water-resistant seal meeting the water seal requirements of ANSI C119.1
- No tools required — installs by pulling the removable core
- Seven sizes (GCTE 20/7 to GCTE 104/42) cover an 8-94 mm application range
- Operating temperature range -40°C to 105°C
- Silicone rubber, free of chloride and sulfur
- Resists abrasion, fungus, acids and alkalis
Applications
- Sealing inline connections and terminal lugs on cable up to 1.1 kV
- Low-voltage cable joints for copper and aluminium conductors up to 1000 sq.mm
Standards & Compliance
- ANSI C119.1
- ASTM D-412
- ASTM D-624
- ASTM D-257
- ASTM G-21
- ASTM D2240
- ASTM D149
FAQs
Frequently Asked Questions
What is the Cold Shrink Tubing used for?
It is used for:
- Sealing inline connections and terminal lugs on cable up to 1.1 kV
- Low-voltage cable joints for copper and aluminium conductors up to 1000 sq.mm
How do I choose the right size?
Measure the outside diameter of the cable and choose the code whose "Application Range" covers it. For example, GCTS 45/16 fits a cable of 18–38 mm. Where two ranges overlap, either code fits.
How is it installed?
No heat and no tools. Place it over the cable, then pull and unwind the spiral support core: it shrinks onto the cable as the core comes out. Remove the core completely so it recovers fully.
Which standards and test methods are quoted for it?
These, with the values in the Technical Specification on this page:
- ANSI C119.1
- ASTM D-412
- ASTM D-624
- ASTM D-257
- ASTM G-21
- ASTM D2240
- ASTM D149
Where can I download the datasheet?
From the "Download datasheet" button at the top of this page, or here:
Can I get a quote, a sample or a size that is not listed?
Send your cable details, quantity and application with the "Request a Quote or Sample" form at the foot of this page. For a size or variant that is not in the chart, describe what you need there, or use Technical support at the top of the page, and the technical team will confirm what can be supplied.
.jpg)
.jpg)
.jpg)
47+
Years manufacturing
100+
Countries served
140
Products in range
ISO 9001:2015
Certified & tested