Product Description
Heat Shrink Anti-Tracking Insulation Tube
Heat shrink anti-tracking insulation tube is a heavy-duty, cross-linked polyolefin sleeve engineered to insulate and protect medium-voltage cable terminations and busbars against accidental flashover. Applied over joints, terminations and conductors, it shrinks down to form a tight, void-free insulating layer with high tracking resistance - a critical requirement wherever surface contamination, moisture and high electric stress would otherwise lead to surface tracking and flashover.
Manufactured from radiation cross-linked polyolefin and supplied in signal red, the tube is rated for medium-voltage cable terminations up to 42 kV. The inner wall is coated with adhesive at one end, sealing the cut edge and locking out moisture once the tube is recovered.
At a glance
Material: cross-linked polyolefin, inner adhesive-coated at one end
Function: anti-tracking insulation + accidental-flashover protection
Voltage: medium-voltage cable terminations up to 42 kV
Shrink temperature: starts at 90 °C, fully recovered at 130 °C
Colour: red
Sizes: 14 standard specs, ID 12–45 mm (recovered), wall 2.2–3.5 mm
Why anti-tracking performance matters
On a medium-voltage termination, the exposed surface between the conductor and earth is stressed by the full system voltage. Dust, salt, moisture and pollution form a conductive film; leakage current then dries the film into dry bands, and the resulting voltage concentration can carbonise the surface into a conductive "track" that runs to flashover.
An anti-tracking (tracking-resistant) tube interrupts this mechanism at the source: its cross-linked polyolefin compound resists carbonisation so that no continuous conductive path can form. The result is a termination that stays insulated through ageing, contamination and heat cycling - the reason this tubing is specified for outdoor terminations, switchgear and busbar systems.
Key features & benefits
High tracking resistance - resists surface carbonisation and dry-band tracking; tested to IEC 60587 (1A 3.5).
Cross-linked polyolefin construction - retains mechanical strength after heat ageing (130 °C × 168 h).
Adhesive-lined end - seals cut edges and blocks moisture ingress for a durable, void-free insulation.
Medium-voltage rated - suited to cable terminations up to 42 kV.
Excellent dielectric performance - dielectric strength ≥ 20 kV/mm; volume resistivity ≥ 1×10¹⁴ Ω·cm.
Wide thermal reliability - heat shock 160 °C / 4 h with no cracking; brittle temperature −40 °C.
Consistent low water absorption - ≤ 0.1 % (23 °C, 24 h), protecting performance in humid and outdoor service.
Controlled recovery - begins shrinking at 90 °C and fully recovers at 130 °C for predictable installation.
Applications
- Medium-voltage cable terminations and joints (up to 42 kV)
- Busbar insulation and flashover protection in switchgear / panel boards
- Anti-flashover sleeving for copper and aluminium busbar connections
- Insulation of cable lugs, cores and connections in MV distribution equipment
- Outdoor and contaminated-environment termination protection
Technical specifications
| Spec. | As supplied ID min (mm) | As supplied wall (±0.3 mm) | Recovered ID max (mm) | Recovered wall (±0.3 mm) | Standard cut length (mm) | Continuous length (m/roll) |
|---|---|---|---|---|---|---|
| WRSJG-30/12 | 30 | 1.0 | 12 | 2.2 | 600–1200 | 25 |
| WRSJG-35/14 | 35 | 1.0 | 14 | 2.3 | 600–1200 | 25 |
| WRSJG-40/17 | 40 | 1.0 | 17 | 2.3 | 600–1200 | 25 |
| WRSJG-50/22 | 50 | 1.0 | 22 | 2.5 | 600–1200 | 25 |
| WRSJG-35/13 | 35 | 1.2 | 13 | 3.0 | 600–1200 | 25 |
| WRSJG-40/15 | 40 | 1.2 | 15 | 3.0 | 600–1200 | 25 |
| WRSJG-50/19 | 50 | 1.1 | 19 | 3.0 | 600–1200 | 25 |
| WRSJG-55/24 | 55 | 1.4 | 24 | 3.2 | 600–1200 | 15 |
| WRSJG-60/26 | 60 | 1.4 | 26 | 3.2 | 600–1200 | 15 |
| WRSJG-70/29 | 70 | 1.4 | 29 | 3.2 | 600–1200 | 15 |
| WRSJG-75/35 | 75 | 1.5 | 35 | 3.2 | 600–1200 | 15 |
| WRSJG-80/36 | 80 | 1.4 | 36 | 3.2 | 600–1200 | 15 |
| WRSJG-90/41 | 90 | 1.6 | 41 | 3.5 | 600–1200 | 15 |
| WRSJG-100/45 | 100 | 1.5 | 45 | 3.5 | 600–1200 | 15 |
Technical data
| Property | Test method | Standard value |
|---|---|---|
| Tensile strength | ASTM D-638 | ≥ 8 MPa |
| Elongation at break | ASTM D-638 | ≥ 300 % |
| Tensile strength variation after heat ageing (130 °C × 168 h) | ASTM D-5510 | ≤ ±30 % |
| Elongation at break variation after heat ageing (130 °C × 168 h) | ASTM D-5510 | ≤ ±30 % |
| Volume resistivity | IEC 60093 | ≥ 1×10¹⁴ Ω·cm |
| Dielectric strength | IEC 60243 | ≥ 20 kV/mm |
| Tracking resistance | IEC 60587 | 1A 3.5 |
| Dielectric constant | IEC 60250 | ≤ 5 |
| Heat shock | 160 °C, 4 h | No crack |
| Water absorption (23 ± 2) °C, 24 h | ISO 62 | ≤ 0.1 % |
| Hardness (Shore A) | ISO 868 | ≥ 80 |
| Brittle temperature | ISO 974 | −40 °C |
How to select the right size
Measure the substrate OD - the diameter of the cable core, lug or busbar to be covered.
Pick by recovered ID - the recovered inner diameter must be smaller than the substrate OD so the tube grips tightly. Example: a 15 mm busbar → choose WRSJG-40/15 (recovers to 15 mm).
Check as-supplied ID - the tube must slide over the largest part of the joint before shrinking.
Confirm wall thickness - thicker walls (3.0–3.5 mm) suit higher-voltage terminations; thinner walls (2.2–2.5 mm) suit compact joints.
Choose length - select from standard cut lengths 600–1200 mm, or order continuous rolls (25 m/roll for smaller specs, 15 m/roll for larger).
Not sure of the size? Send us the cable/busbar OD and voltage class - we will recommend the correct spec.
Product display
Certificate
Installation guidance
Clean and degrease the substrate; remove all sharp edges and burrs.
Slide the tube over the joint, positioning the adhesive-coated end toward the cut edge to be sealed.
Apply heat evenly with a hot-air gun, starting at the 90 °C shrink-onset point.
Work along the tube until it is fully recovered at 130 °C - the surface should be smooth with the substrate contours visible.
Verify no voids or trapped air; allow to cool before energising.
FAQ
Q: What voltage is this anti-tracking heat shrink tube rated for? A: It is designed for medium-voltage cable terminations up to 42 kV.
Q: What material is the tube made from? A: Radiation cross-linked polyolefin, with an adhesive coating on the inner wall at one end.
Q: What is the shrink temperature? A: Shrinking starts at 90 °C and the tube is fully recovered at 130 °C.
Q: Why is "anti-tracking" important? A: Tracking (surface carbonisation) is the main pathway to flashover on contaminated MV terminations. An anti-tracking compound resists carbonisation, so no conductive path forms. This tube is tested to IEC 60587 .
Q: What sizes are available? A: 14 standard specs from WRSJG-30/12 (recovers to 12 mm ID) up to WRSJG-100/45 (recovers to 45 mm ID).
Q: What colour is it? A: Red.
Q: How is it supplied? A: Standard cut lengths of 600–1200 mm, or continuous rolls - 25 m/roll for smaller diameters, 15 m/roll for larger ones.
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