Heat Shrink Semi-conductive Tubing
✅Excellent Electrical Field Control
✅Superior Environmental Sealing
✅Robust Mechanical Protection
✅Effortless Installation
✅Proven Long-Term Reliability
- Product Introduction
Heat-Shrink Semi-conductive Tubing features a specialized semi-conductive material integrated into either its inner or outer layer. Unlike standard heat-shrink sleeves, its primary purpose is not electrical insulation. Instead, Heat-Shrink Semi-conductive Tubing leverages its unique semi-conductive properties to equalize electrical stress, eliminate partial corona discharges, and provide critical shielding protection. This makes it an indispensable component in the engineering and installation of medium- and high-voltage power cable joints.
Working Principle
Working Principle
At the connection points of high-voltage cable joints, the electrical field naturally becomes highly concentrated and non-uniform, leaving the system highly susceptible to corona discharge. Over time, these localized discharges can degrade the surrounding insulation and cause critical system faults.
Because the resistivity of this semi-conductive layer bridges the gap between a true conductor and a true insulator, it smoothly transitions the electric field gradient. By preventing electric field distortion and effectively suppressing partial discharge, it safeguards the insulation and ensures the long-term, stable operation of the power line.
Product Parameters
| Material Performance Test Specifications | ||
| Item | Test Standard | Standard Limit |
| Mechanical Properties | ||
| Tensile strength (MPa) | ASTM D2671 | ≥ 14 MPa |
| Elongation at break (%) | ASTM D2671 | ≥ 300 % |
| Elongation at break after Heat Aging (%) (158℃×168h) | ASTM D2671 | ≥ 200 % |
| Dimensional & Shrinkage Properties | ||
| Longitudinal shrinkage ratio (%) | ASTM D2671 | ± 5 % |
| Radial shrinkage ratio | ASTM D2671 | 2.5:1 |
| Eccentricity (%) | ASTM D2671 | < 30 % |
| Electrical Properties | ||
| Volume resistance (Ω·cm) | ASTM D2303 | ≥ 1×10¹⁴ Ω·cm |
| Physical & Thermal Properties | ||
| Water absorption (%) | ISO 62 | < 0.15 % |
Note: The parameters listed above represent typical values. Please feel free to contact us if you have any questions or require further clarification
Product Dimensions
| Normal size | AS supplied | After Shrinking | Standard Length (m/roll) | |
| Inside Diameter (Min) (mm) | Inside Diameter (Max) (mm) | Wall Thickness (Max) (mm) | ||
| BDDG-35/14 | >35 | 14 | 2.0 | 100 |
| BDDG-40/16 | >40 | 16 | 2.2 | 100 |
| BDDG-50/20 | >50 | 20 | 2.4 | 100 |
| BDDG-60/25 | >60 | 25 | 2.5 | 100 |
| BDDG-70/30 | >70 | 30 | 2.5 | 100 |
| BDDG-80/35 | >80 | 35 | 2.8 | 100 |
| BDDG-100/40 | >100 | 40 | 3.2 | 100 |
| BDDG-120/50 | >120 | 50 | 3.2 | 100 |
Customized requirement,contact us
Key Features & Advantages
Excellent Electrical Field Control: Effectively manages electrical stress, suppresses corona and partial discharge (PD), and ensures robust high-voltage insulation safety.
Superior Environmental Sealing: (For adhesive-lined profiles) Formidable barrier against moisture, water ingress, and chemical corrosion, significantly extending joint lifespan.
Robust Mechanical Protection: Provides exceptional resistance to abrasion, impact, and external mechanical damage.
Effortless Installation: Shrinks uniformly upon heating to conform tightly and seamlessly to irregular profiles and complex geometries.
Proven Long-Term Reliability: Fully complies with international power industry standards, ensuring a long, maintenance-free service life under harsh operating conditions.
Applications
Heat Shrink Semi-conductive Tubing is core component in medium- and high-voltage power cable accessories such as 10kV, 35kV.
● The fabrication of cable terminations and straight joints.
● Restoring the inner and outer semi-conductive shielding layers that are stripped at cable joints.
● Insulation and shielding treatment for phase A, B, C cable joints and branch joints.
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