K125 Flexible Flame-Retardant Polyolefin Heat Shrink Tubing
K125 is a halogen-free, red-phosphorus-free polyolefin tubing with a 2:1 shrink ratio and -55 to 125 °C service. It is flexible, fast-shrinking and flame retardant, for terminal insulation, wire bundling and end protection in appliances, automotive, EV charging and industrial equipment.
2:1
Shrink ratio
Polyolefin
Material
Specifications
Key specifications
| Part number | K125 |
|---|---|
| Size range | ID 1~50mm |
| Shrink ratio | 2:1 |
| Material | Polyolefin |
Dimensions
Standard sizes
| Spec Ø (mm) | Expanded ID (mm) | Expanded wall (mm) | Fully recovered max ID (mm) | Fully recovered wall (mm) |
|---|---|---|---|---|
| φ1.0 | 1.5±0.3 | 0.18±0.06 | 0.6 | 0.33±0.08 |
| φ1.5 | 2.0±0.3 | 0.20±0.08 | 0.75 | 0.36±0.08 |
| φ2.0 | 2.5±0.3 | 0.20±0.08 | 1.0 | 0.42±0.08 |
| φ2.5 | 3.0±0.3 | 0.22±0.08 | 1.25 | 0.44±0.08 |
| φ3.0 | 3.5±0.3 | 0.25±0.08 | 1.5 | 0.44±0.08 |
| φ3.5 | 4.0±0.3 | 0.25±0.08 | 1.75 | 0.44±0.08 |
| φ4.0 | 4.5±0.3 | 0.25±0.08 | 2.0 | 0.44±0.08 |
| φ4.5 | 5.0±0.3 | 0.25±0.08 | 2.25 | 0.44±0.08 |
| φ5.0 | 5.5±0.3 | 0.25±0.08 | 2.5 | 0.50±0.08 |
| φ5.5 | 6.0±0.3 | 0.25±0.08 | 2.75 | 0.50±0.08 |
| φ6.0 | 6.5±0.3 | 0.28±0.10 | 3.0 | 0.54±0.10 |
| φ7.0 | 7.6±0.3 | 0.30±0.10 | 3.5 | 0.56±0.10 |
| φ8.0 | 8.6±0.3 | 0.30±0.10 | 4.0 | 0.56±0.10 |
| φ9.0 | 9.6±0.4 | 0.30±0.10 | 4.5 | 0.56±0.10 |
| φ10.0 | 10.7±0.4 | 0.30±0.10 | 5.0 | 0.56±0.10 |
| φ11.0 | 11.7±0.4 | 0.30±0.12 | 5.5 | 0.56±0.10 |
| φ12.0 | 12.7±0.4 | 0.30±0.12 | 6.0 | 0.56±0.12 |
| φ13.0 | 13.7±0.4 | 0.35±0.12 | 6.5 | 0.65±0.12 |
| φ14.0 | 14.7±0.4 | 0.35±0.12 | 7.0 | 0.65±0.12 |
| φ15.0 | 15.7±0.5 | 0.35±0.12 | 7.5 | 0.65±0.12 |
| φ16.0 | 16.7±0.5 | 0.35±0.12 | 8.0 | 0.65±0.12 |
| φ17.0 | 17.7±0.5 | 0.35±0.12 | 8.5 | 0.65±0.12 |
| φ18.0 | 19.0±0.5 | 0.40±0.12 | 9.0 | 0.77±0.15 |
| φ20.0 | 21.0±0.5 | 0.40±0.15 | 10.0 | 0.77±0.15 |
| φ22.0 | 23.0±0.5 | 0.40±0.15 | 11.0 | 0.77±0.15 |
| φ25.0 | 26.0±1.0 | 0.45±0.15 | 12.5 | 0.87±0.15 |
| φ28.0 | 29.0±1.0 | 0.45±0.15 | 14.0 | 0.87±0.15 |
| φ30.0 | 31.5±1.0 | 0.45±0.15 | 15.0 | 0.87±0.15 |
| φ35.0 | 36.5±1.0 | 0.50±0.20 | 17.5 | 0.97±0.15 |
| φ38.0 | 39.5±1.0 | 0.50±0.20 | 19.0 | 0.97±0.20 |
| φ40.0 | 41.5±1.0 | 0.50±0.20 | 20.0 | 0.97±0.20 |
| φ50.0 | 51.5±1.0 | 0.55±0.20 | 25.0 | 1.00±0.20 |
Performance
Typical test data
| Property | Requirement | Test method | Typical value |
|---|---|---|---|
| Longitudinal shrinkage | ±10% | ASTM D 2671 | ±7% |
| Tensile strength | ≥10.4 MPa | ASTM D 638 | ≥11 MPa |
| Elongation at break | ≥200% | ASTM D 638 | ≥400% |
| Elongation after ageing(heat ageing 158°C×168h) | ≥100% min. | ASTM D 638 | ≥400% |
| Heat shock(200°C×4h) | No cracks | ASTM D 2671 | Pass |
| Cold bend(-55°C×4h) | No cracks | ASTM D 2671 | Pass |
| Breakdown strength | ≥12 kV/mm | ASTM D 2671 | 15 kV/mm |
| Volume resistivity | ≥10¹² Ω·cm | ASTM D 876 | ≥10¹³ Ω·cm |
Applications
Where it is used
- Home appliances and white goods
- Automotive wire harnesses
- EV charging and energy storage
- Industrial control and automation
- LED lighting and electronic components
Next step
Request a datasheet, sample or quote
Send the size range, operating temperature and delivery requirement. We will reply with the recommended construction, wall thickness, shrink ratio and a sample plan.