Heat Shrink Semi-conductive Tube
- CCMT
- CHANGCHUN,CHINA
- Based on the order quantity
- 5 million meters per month
1. Tensile strength in our semi-conductive heat shrink tube is ≥13MPa and elongation at break is ≥300% which allows it to withstand impact and still have great flexibility.
2. The semi-conductive heat shrink tube becomes smaller at 90℃and completely shapes at 130℃, making it perfect cover for cable joints as it wraps around them with great tightness and efficiency.
3. Our heat shrink semi-conductive pipe stops moisture from getting in which is important to maintain cable joint reliability, especially for those placed in humid places and salt-spray areas for a long time.
In addition to mechanical vibration, thermal cycling stress, and water vapor getting into them, medium and high voltage cable joints are also affected by these three major physical loads at the same time during service.
The problem is that traditional sheath materials can seldom be designed for both excellent mechanical properties and low water absorption, which results in cracking of the material or water ingress through the interface of the cable jacket and the filler, thus, accelerating partial discharges and finally the breakdown of the insulation after some time.
Our heat shrink semi-conductive tubing is cross-linked by electron beam that allows the material to attain a tensile strength of ≥13MPa and a breaking elongation of ≥300%, so that the tube remains strong even under varying mechanical loads. With a very low uptake of water ≤0.5%, a dimensional stability with the smallest shrinkage of ≤10% on a lengthwise base, and no shrinkage in thickness, the shrinkage of the tube results into a gapless seating of the cable interface thus, blocking any moisture entry along the joint.
Product Introduction:
Heat-shrinkable semi-conductive tubing is mainly used as a protective layer for electric cables made from cross-linked polyolefins - the kind of advanced polyethylene materials. The use of beam-curing cross-linking greatly increases mechanical strength, temperature resistance, and long-term durability of the product. Besides that, this material has semi-conductive properties on the one side, shielding characteristics on the other, and insulating layer in the middle. The result is quite remarkable: the cable has the same field strength in each point, there are no hot spots where partial discharges are likely, and there are no leakages neither short circuits nor electromagnetic interference. It is a must have for cable junctions and terminations, as well as power equipment of medium and high voltage, guaranteeing safe isolation, and thereby protection of electric systems against faults.
Product Parameters:
| Product No. | Inner Diamerter(mm) | After Recovered Wall Thickness (±0.2mm)/mm | Standard Cut Length(mm) | Standard Continuous Length(m/roll) | |
| Befor Recoveryed(Min) | After Recoveryed(Max) | ||||
| 45/17 | 45 | 17 | 2.3 | 400-1200 | 25 |
| 50/17 | 50 | 17 | 2.3 | 400-1200 | 25 |
| 50/19 | 50 | 19 | 2.3 | 400-1200 | 25 |
| 55/19 | 55 | 19 | 2.3 | 400-1200 | 25 |
| 55/23 | 55 | 23 | 2.3 | 400-1200 | 25 |
| 60/23 | 60 | 23 | 2.3 | 400-1200 | 25 |
| 60/25 | 60 | 25 | 2.3 | 400-1200 | 25 |
| 65/25 | 65 | 25 | 2.3 | 400-1200 | 25 |
| 75/29 | 75 | 29 | 2.8 | 400-1200 | 25 |
| 80/29 | 80 | 29 | 2.8 | 400-1200 | 25 |
| 85/29 | 85 | 29 | 2.8 | 400-1200 | 15 |
| 100/29 | 100 | 29 | 2.8 | 400-1200 | 15 |
| 100/35 | 100 | 35 | 2.8 | 400-1200 | 15 |
| 120/35 | 120 | 35 | 2.8 | 400-1200 | 15 |
Product Performance Indicators:
| Property | Test Method | Standard Value |
| Tensile Sterngth(MPa) | ASTM-D-638 | ≥ 13MPa |
| Elongation at Break(%) | ASTM-D-638 | ≥ 300% |
| Tensile Sterngth after Heat Aged(MPa) | ASTM-D-638 | ≥ 10.5MPa(130℃,168hrs) |
| Elongation at Break after Heat Aged(%) | ASTM-D-638 | ≥ 240%(130℃,168hrs) |
| Volume Resistivity | IEC 60093 | ≤1×10¹³Ω·cm |
| Longitudinal Shrinkage(%) | ASTM-D-2671 | ≤10% |
| Eccentricity | ASTM-D-2671 | ≤30% |
| Water Absorption | ISO 62 | ≤0.5% |
Advantages of Semi-Conductive Heat Shrink Tubing:
1. High Mechanical Strength and Excellent Flexibility.
Made through a cross-linking procedure, this semiconductive heat shrink tube has a tensile strength of at least 13 MPa and an elongation at break of at least 300%. It has a balanced mix of good flexibility and high impact resistance, being able to resist breaking or deforming even though stretched, compressed, or vibrated while installing a material. The tubing is applicable in the field of power engineering, as well as harsh and complex environmental conditions.
2. Rapid Shrink Molding, Improving Installation Efficiency and Sealing Reliability.
The semiconductor type of heat shrinkable tube not only gives consistent heat shrinkage characteristics but also commences shrinking at about 90℃ and is completely shrunk at 130℃. Therefore, it is extremely effective in snugly fitting cables and the joints so that there is almost no possibility of loosening of the connection and at the same time provides an even and consistent protective coating which, in general, also brings about improved work efficiency in the installations.
3. Moisture-Proof Protection, Suitable for Long-Term Outdoor Applications.
With water absorption at a minimum of just 0.5%, semiconductive heat shrink tubing not only serves as an ideal waterproof seal which effectively inhibits the moisture from accessing the protected area but at the same time prevents it to the maximum. Along with a longitudinal shrinkage that remains within 10% it keeps shape very well after shrinking, resulting in the formation of the protective layer that fits perfectly and greatly improving cable accessory lifetime performance reliability in environments that are humid, salt spray, and outdoor.
Applications of Heat Shrink Semi-Conductive Tubes:
Primarily employed in medium and high voltage cable terminations and intermediate joint systems, these tubes recover the cable's semiconductor shielding and insulation structure, evenly distributing the electric field, thereby preventing local discharge and offering good insulation, keeping the cable dry, and providing seal at the same time.
Thanks to their outstanding electrical capabilities and ability to perform well within varied environments, these products have become go-to choices for various applications such as substations, power distribution systems, switchgear, switchboards in factories, and power facilities that rely on renewable energy.
In addition to offering a reliable insulation barrier for cable connections for a long time, this product can significantly raise the safety and dependability level for power utility systems.
About CCMT:
Since we started in 1986, the company has never stopped researching, developing, and manufacturing cable accessories. Besides, the company has collected field experience from the application of products for over 40 years. We are able to fully control and produce only two processes, radiation crosslinking and silicone vulcanization. These are achieved through the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, which has acted as a technical partner to us. For any installation, whether a hot melt or cold shrink type of terminals, or even, intermediate joints, we are able to deliver reliable solutions for voltage levels up to 220kV, and also provide customized ones where needed, even for the most difficult conditions of use.
Our Manufacturing Capabilities:
Our company has a 10,000-square-meter factory, 200 employees, and more than 40 different machines that all work together to make our production process as smooth and fast as possible. Just to give you an idea of the scale, for the production of heat-shrink tubing alone, we have 13 extrusion lines, 10 oil-expansion lines, and 5 pneumatic expanders all working together to give us an output of 5 million meters per month.
We have obtained ISO 9001:2015 certification (00123Q36311R5M/2200), and our products comply with CE, RoHS, REACH, and SGS requirements. More importantly, we accompany each shipment with an independent quality inspection report and a third-party type test report, providing our customers with a complete quality record.
Our Clients:
We serve multinational corporations such as ABB, Shell, Raychem, and 3M. We have provided tens of thousands of meters of ultra-thick three-layer co-extruded heat-shrinkable composite tubing to Raychem and tens of tons of potting compound to Shell, demonstrating our ability to consistently deliver products that meet international standards.
Exhibition Highlights:
At the 2025 EP Shanghai International Power Exhibition, our full range of 220kV cold and heat shrinkable products was showcased not just as samples, but as a comprehensive demonstration of our capabilities from R&D drawings to mass production. The recognition from professional clients worldwide is a testament to our long-term expertise in the field of power connection safety.
FAQ:
1. Is heat shrink semi-conductive tube suitable for outdoor or humid environments?
Right. The material has a very low water absorption rate of at most 0.5%, it is highly water resistant and is tightly sealed. It can even be used for years in humid environments, places exposed to sea salt, and outdoors.
2. Will the heat shrink semi-conductive tube shrink and deform significantly after installation?
No. The product has a longitudinal shrinkage rate of ≤10%, and its dimensions remain stable after shrinkage, allowing it to fit tightly against the cable surface and form a uniform and reliable protective layer.
