Track-resistant silicone tubing for medium voltage insulation where pollution, moisture and surface discharge are present.
| Shrink ratio | 2:1 |
|---|---|
| Recovered wall | 0.60–1.30 mm by size |
| Operating temp | -60 to +180 °C |
| Standards | IEC 60587, IEC 60684, IEC 60855, RoHS |
Anti-tracking heat shrink tubing is a silicone rubber sleeving formulated to resist the formation of conductive carbonized paths on its surface. When medium voltage insulation is exposed to wet pollution layers, small surface discharges carbonize ordinary polymers and create tracking channels; anti-tracking silicone decomposes to a non-conductive silica-rich residue instead, so the leakage current stays low over long service.
The product builds on the silicone compounding and testing work behind our cold-shrink cable accessories, which use anti-tracking liquid silicone rubber verified by type tests at the power industry quality inspection center. This draft proposes the same material class in a heat-shrinkable form for busbar runs, cable termination stems and outdoor insulating covers. Parameters below are draft values pending confirmation by our test lab.
| Property | Test Method | Requirement | Typical |
|---|---|---|---|
| Track resistance | IEC 60587 1A4.5 | Pass at 4.5 kV | Pass |
| Tensile strength | ASTM D638 | ≥4 MPa | 5 MPa |
| Elongation at break | ASTM D638 | ≥300% | 380% |
| Dielectric strength | IEC 243 | ≥20 kV/mm | 22 kV/mm |
| Volume resistivity | IEC 93 | ≥10¹⁴ Ω·cm | 2×10¹⁴ |
| Tear strength | ASTM D624 | ≥10 kN/m | 12 kN/m |
| Hardness | Shore A | 50±5 | 52 |
| Water absorption | ISO 62 | <0.5% | 0.2% |
| Longitudinal change | UL 224 | -5% to +5% | -2% |
Internal test data. Questions on parameters? Contact our engineers.
| Size | Expanded ID (mm) | Recovered ID (mm) | Wall (mm) | Spool (m) |
|---|---|---|---|---|
| Φ6.0 | 6.4 ±0.4 | 2.8 ±0.2 | 0.60 ±0.10 | 100 |
| Φ10 | 10.5 ±0.4 | 4.8 ±0.2 | 0.70 ±0.10 | 100 |
| Φ16 | 16.5 ±0.5 | 7.7 ±0.3 | 0.80 ±0.10 | 100 |
| Φ20 | 21.0 ±0.5 | 9.7 ±0.3 | 0.90 ±0.10 | 50 |
| Φ30 | 30.8 ±0.8 | 14.0 ±1.0 | 1.00 ±0.15 | 25 |
| Φ40 | 41.0 ±1.0 | 19.0 ±1.0 | 1.10 ±0.15 | 25 |
| Φ50 | 51.0 ±1.0 | 24.0 ±1.0 | 1.20 ±0.15 | 25 |
| Φ70 | 71.0 ±1.0 | 33.0 ±2.0 | 1.30 ±0.15 | 25 |
Standard color: black. Custom colors available — contact our sales team.
Insulating cover over the stress-relief region of 10-35 kV terminations in coastal and industrial pollution zones.
Phase insulation where condensation and dust layers raise the risk of surface tracking inside panels.
Covers for bare connections and jumpers exposed to rain, UV and salt fog in substations.
Still deciding? Contact our engineers.
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