SRS-3X/4X Dual Wall Tubing
Product Application
The SRS Series environmental flame-retardant dual-wall heat shrink tubing is engineered from high-quality polyolefin with an inner layer of hot-melt adhesive. It fully complies with EU RoHS environmental directives.
After full recovery, the tubing delivers excellent electrical insulation, waterproof sealing, corrosion protection, and mechanical reinforcement.
It is widely used in electrical and electronic assemblies, providing reliable insulation, moisture protection, cable reinforcement, and long-term environmental sealing.
Product Features
Shrink Ratio: 3:1 and 4:1
Full Recovery Temperature: 110°C
Operating Temperature Range: –40°C to +105°C
Construction: Flame-retardant polyolefin outer layer with hot-melt adhesive inner layer
Environmental Compliance: Fully meets EU RoHS requirements
- Zhizheng
- HUBEI
- Information
SRS-3X/SRS-4X retardant dual wall heat shrinkable tubing
Product Performance Index
| Item | Test Conditions | Required Indicators | Typical Test Data |
|---|---|---|---|
| Tensile Strength | ASTM D 638 | ≥10.4 MPa | 11 MPa |
| Elongation at Break | ASTM D 638 | ≥300% | 350% |
| Volumetric Resistivity | IEC 93 | ≥10¹⁴ Ω·cm | 2×10¹⁴ Ω·cm |
| Water Absorption | ISO 62 | <0.5% | 0.15% |
| Tensile Strength after Aging | Aging at 158°C for 7 days (168 hours) | ≥10 MPa | 10.5 MPa |
| Elongation after Aging | Aging at 158°C for 7 days (168 hours) | ≥300% | 330% |
| Dielectric Strength | IEC 243 | >20 kV/mm | 23 kV/mm |
| Power Frequency Voltage Resistance Strength | 2.5 kV, 60 seconds | No breakdown | Pass |
| Copper Stability | Aging at 158°C for 7 days (168 hours) | No corrosion | Pass |
| Wall Thickness Deviation Rate | UL 224 | ≤30% | 13% |
| Longitudinal Shrinkage | — | ±5% | +3% |
| SRS-3X Series specification sheet | ||||||||
| Size | Before shrink inner diameter D (mm) | After shrink inner diameter d (mm) | Packing (M/Spool,PCS) | |||||
| φ3.2 | 3.5±0.3 | 1.00 | 200 | |||||
| φ4.8 | 5.2±0.3 | 1.60 | 100 | |||||
| φ6.4 | 6.8±0.4 | 2.20 | 100 | |||||
| φ7.9 | 8.4±0.4 | 2.70 | 100 | |||||
| φ9.5 | 9.9±0.4 | 3.20 | 1.22 | |||||
| φ12.7 | 13.2±0.5 | 4.20 | 1.22 | |||||
| φ15.0 | 15.6±0.5 | 5.20 | 1.22 | |||||
| φ19.1 | 19.6±0.5 | 6.30 | 1.22 | |||||
| φ25.4 | 25.4±0.8 | 8.50 | 1.22 | |||||
| φ30.0 | ≥30 | 10.20 | 1.22 | |||||
| φ39.0 | ≥40 | 13.50 | 1.22 | |||||
| φ50.0 | ≥50 | 17.00 | 1.22 | |||||
| φ64.0 | ≥64 | 21.00 | 1.22 | |||||
| SRS-4X Series specification sheet | |||||||
| Size | Min. ID Before Shrink (mm) | After Shrink (mm) | Packing (M/Spool,PCS) | ||||
| Max. ID | Total Wall Thk. | Adhesive Thickness | |||||
| φ4.0 | φ4.0 | φ1.0 | 1.0±0.15 | 0.4±0.15 | 200 | ||
| φ6.0 | φ6.0 | φ1.5 | 1.1±0.15 | 0.4±0.15 | 100 | ||
| φ8.0 | φ8.0 | φ2.0 | 1.2±0.15 | 0.5±0.15 | 1.22 | ||
| φ12.0 | φ12.0 | φ3.0 | 1.4±0.15 | 0.5±0.15 | 1.22 | ||
| φ16.0 | φ16.0 | φ4.0 | 1.7±0.15 | 0.6±0.15 | 1.22 | ||
| φ20.0 | φ20.0 | φ5.0 | 2.0±0.15 | 0.6±0.15 | 1.22 | ||
| φ24.0 | φ24.0 | φ6.0 | 2.1±0.15 | 0.6±0.15 | 1.22 | ||
| φ32.0 | φ32.0 | φ8.0 | 2.4±0.15 | 0.7±0.15 | 1.22 | ||
| φ52.0 | φ52.0 | φ13.0 | 2.4±0.15 | 0.7±0.15 | 1.22 | ||
| Standard color: black | |||||||
