Triple Layer Co-Extrusion Heat Shrink Tubing
- CCMT
- CHANGCHUN,CHINA
- Based on the order quantity
- 5 million meters per month
1.Tri-layer shrinkable tube for cable joint adopts semi-conductive layer, insulating layer and elastic layer co-extrusion design.
2. Riple layer heat shrinkable tubing Crosslinked thick-walled structure has high resilience.
3.Tri-layer heat shrink tube is suitable for 6- 36kV voltage class, up to 42kV power cable joint insulation treatment.
Cable joints will be affected by load changes and temperature changes during operation, and the cable insulation layer may undergo repeated thermal expansion and contraction. If the resilience and elasticity of the external insulating material are insufficient, problems such as a decrease in bonding pressure and an increase in interface clearance may occur after long-term operation, which in turn affects the insulation reliability of the joint.
CCMT's riple layer heat shrinkable tubing adopts a semiconductive/insulating/elastic three-layer structure, forms an integrated composite pipe body through a co-extrusion process, and uses a cross-linked thick-walled structure to provide higher retraction force. After heat shrinkable installation, it can continue to adhere to the cable joint area while retaining a certain degree of elasticity to adapt to the size change of the cable insulation layer due to thermal expansion and contraction.
Product Introduction:
The tri-layer shrinkable tube for cable joint is a thick-walled heat shrinkable product specially used for the insulation treatment of power cable joints. During installation, the pipe is thermally contracted by a heating temperature of 135 - 150 ° C, and the shrunk pipe body can closely adhere to the cable joint and insulation layer. The three-layer structure assumes the functions of electrical stress control, insulation protection and elastic recovery respectively, allowing the product to not only provide insulation coverage, but also adapt to the size changes occurring during cable operation.
Product Parameters:
| Property | Test Method | Values | |
| Inner Layer | |||
| Physical | Tensile strength | ASTM D2671 | ≥6 MPa |
| Breakdown elongation | ASTM D2671 | ≥400% | |
| Aging (136°C/168hrs) | Tensile strength | ASTM D2671 | ≥2 MPa |
| Breakdown elongation | ASTM D2671 | ≥300% | |
| Thermal endurance | IEC 216 | 105°C | |
| Water absorption (23°C/336hrs) | ASTM D570 | ≤0.5% | |
| Density | ASTM D2671 | 0.95~1.05 | |
| Low temperature flexibility (-55°C/4hrs) | ASTM D2671 | No cracking. | |
| Hardness (Shore D) | ASTM D2671 | ≥30HD | |
| Electrical | Dielectric strength (in insulation oil) | ASTM D2671 | ≥15 kV/mm |
| Volume resistivity | ASTM D2671 | ≥1014 Ω·cm | |
| Middle Layer | |||
| Physical | Tensile strength | ASTM D2671 | ≥10.5 MPa |
| Breakdown elongation | ASTM D2671 | ≥400% | |
| Aging (136°C/168hrs) | Tensile strength | ASTM D2671 | ≥10.5 MPa |
| Breakdown elongation | ASTM D2671 | ≥350% | |
| Thermal endurance | IEC 216 | 105°C | |
| Water absorption (23°C/336hrs) | ASTM D570 | ≤0.5% | |
| Density | ASTM D2671 | 1.05~1.15 | |
| Low temperature flexibility (-40°C/4hrs) | ASTM D2671 | No cracking. | |
| Heat shock (200°C/30mins) | ASTM D2671 | No cracking. | |
| Hardness (Shore D) | ASTM D2671 | ≥48HD | |
| Electrical | Dielectric strength (in insulation oil) | ASTM D2671 | ≥15 kV/mm |
| Volume resistivity | ASTM D2671 | ≥1013 Ω·cm | |
| Outer Layer | |||
| Physical | Tensile strength | ASTM D2671 | ≥20 MPa |
| Breakdown elongation | ASTM D2671 | ≥350% | |
| Aging (158°C/168hrs) | Tensile strength | ASTM D2671 | ≥16 MPa |
| Breakdown elongation | ASTM D2671 | ≥300% | |
| Thermal endurance | EC 216 | 135°C | |
| Water absorption (23°C/336hrs) | ASTM D570 | ≤0.5% | |
| Density | ASTM D2671 | 1.05~1.10 | |
| Heat shock (250°C/30mins) | ASTM D2671 | No cracking. No drop, no flow | |
| Low temperature flexibility (-40°C/4hrs) | ASTM D2671 | No cracking. | |
| Hardness (Shore D) | ASTM D2671 | ≥55 HD | |
| Electrical | Volume resistivity | ASTM D2671 | ≤1014 Ω·cm |
| Inner Layer & Middle Layer & Outer Layer | |||
| Halogen free | IEC 61249-2-21 | Cl: 900ppm max. Br: 900ppm max. Total (Cl+Br): 1500ppm max | |
Product Specifications:
| Reference | As Supplied(mm) ID min | After Recovered(mm) | Standard Length (m) | |
| ID max. | WT nom. | |||
| 35/13 | 35 | 13 | 11.0 | 1 or 1.22 |
| 45/17 | 45 | 17 | 12.0 | 1 or 1.22 |
| 50/21 | 50 | 21 | 12.7 | 1 or 1.22 |
| 63/26 | 63 | 26 | 13.5 | 1 or 1.22 |
| 75/34 | 75 | 34 | 13.5 | 1 or 1.22 |
| 85/34 | 85 | 34 | 13.5 | 1 or 1.22 |
| 95/42 | 95 | 42 | 14.2 | 1 or 1.22 |
| 110/52 | 110 | 52 | 14.2 | 1 or 1.22 |
| 125/62 | 125 | 62 | 15.0 | 1 or 1.22 |
ID=Internal Diameter ; WT=Wall Thickness
When purchasing, it is recommended to provide the maximum outer diameter of the cable joint, the length to be covered and the cable voltage level. CCMT can assist in confirming appropriate specifications based on the actual installed size.
Product Advantages:
1. The three-layer structure achieves multi-functional collaboration.
Unlike a single material heat shrink tube, this tri-layer heat shrink tube combines a semiconductive layer, an insulating layer and an elastic layer in a composite tube body, allowing the product to simultaneously meet the needs of electrical stress control, insulation protection and elastic recovery. It is more suitable for cable joints, which require high structural integrity.
2. High retraction force adapts to long-term size changes of the joint.
Cross-linked thick-walled pipes have high resilience. The trilayer heat shrink tube for cable joint can continue to apply shrinking pressure to the surface of the cable joint after heat shrinking, which helps maintain a tight fit between the tube body and the insulation layer and adapts to the size change of the cable insulation layer due to temperature changes.
3. The shrinkage ratio is 2.5:1, taking into account the size adaptation range.
The trilayer heat shrink tube for cable joint provides a 2.5:1 shrinkage ratio that can cover a large range of installation size changes. For joint projects with different cable diameters, buyers can match specifications based on the actual cable outer diameter and joint structure, and support customization of shrinkage ratios.
4. Suitable for insulation treatment of medium voltage cable joints.
The operating temperature range of triple layer heat shrinkable tubing is-55 to 105 ℃, which is suitable for voltage levels of 6 to 36kV. It can be used for insulation treatment and partial discharge control needs of power cable joints up to 42kV, providing targeted insulation protection solutions for medium voltage cable joints.
5. Halogen free environmentally friendly design.
Triple layer heat shrinkable tubing adopts halogen-free design and complies with RoHS requirements. It is suitable for power and infrastructure projects that require the control of environmentally friendly materials and hazardous substances.
Product Usage Scenarios:
· Medium voltage power cable joints: used for external insulation protection of 6~36kV power cable joints, and can be used as an important heat shrinkage component in the joint insulation system.
· Cable joint insulation and stress control: Corresponding electrical insulation and stress control are carried out for the joint area, which is suitable for cable connection items requiring partial discharge control.
· Power engineering and cable accessory manufacturing: Suitable for cable accessory manufacturers, power engineering contractors and electrical equipment suppliers to carry out batch supporting procurement. Corresponding specifications or customized solutions can also be provided according to cable specifications and joint size.
Why Choose CCMT?
Changchun Chemistry Technology Co., Founded in 1986, Ltd. has more than 40 years of industry experience. Our product system covers heat shrinkage, cold shrinkage, cable joints, terminals, heat shrinkage tubing, sealing materials and other cable insulation protection products. The product voltage level can reach up to 220kV.
Large-scale production base.
Our company has approximately 10,000㎡ production base, 200+ employees, and 40+ professional production equipment. The production system covers multiple key processes such as extrusion, molding, injection molding, expansion and sealing materials, and can support mass production of cable accessories of different specifications. and OEM/customization needs.
Among them, heat shrinkable products have 13 plastic extrusion production lines, 10 oil expanders and 5 air expanders. The supply capacity of heat shrinkable products can reach approximately 5 million meters per month.
Technology and quality control.
CCMT has received technical support from Changchun Institute of Applied Chemistry and continues to develop products in terms of irradiation crosslinking, silicone rubber vulcanization, and cable accessory materials and processes. Our company has established an ISO 9001:2015 quality management system and conducts quality control of products from raw materials and production processes to finished product delivery. Relevant heat shrinkable and cold shrinkable cable terminals and joints have been type tested and verified by international third-party organizations; the products comply with RoHS, REACH and other relevant environmental protection requirements.
Supply capabilities to global customers.
CCMT has long served domestic and foreign power, communications, infrastructure and energy projects, and has the ability to supply bulk orders, project orders and customized products. We establish business connections with global customers through international industry exhibitions, covering markets such as Asia, Europe, the Middle East and South America.
In terms of order service, technical confirmation, production scheduling and shipping arrangements can be carried out according to the customer's product specifications, purchase quantity and project requirements; for customized specifications, targeted product development and production can be carried out after confirming technical parameters.
Project experience.
CCMT has experience in supplying many power and nuclear power related projects. We have provided relevant heat shrinkable cable accessory products to Hainan Nuclear Power Station, Tianwan Nuclear Power Station, Taishan Nuclear Power Station, Ling 'ao Nuclear Power Station and Fangjiashan Nuclear Power Station and other projects.
These project experience allows us to provide more complete supply support to cable accessory buyers from product specification confirmation, production quality control to batch supply.
International exhibitions and market expansion.
We continue to participate in international power and industry exhibitions, including the 2023 Hannover Messe, the 2024 Dubai Power Show and the 2025 Shanghai Power Show, etc., to conduct product and technology exchanges with power companies, engineering contractors, electrical equipment manufacturers and overseas buyers.
FAQ:
1. What is the difference between triple layer heat shrinkable tubing and ordinary heat shrinkable tubing?
The tri-layer heat shrink tube consists of a semiconductive layer, an insulating layer and an elastic layer. It not only provides external insulation protection, but also takes into account electrical stress control and elastic recovery, making it more suitable for cable joints.
2. What does a contraction ratio of 2.5:1 mean?
2.5:1 represents the theoretical size ratio between the product before shrinkage and after full shrinkage, which can help the product cover a larger range of cable diameter changes. The actual specifications still need to be confirmed based on the cable outer diameter and joint size.
3. Can the three-layer structure replace ordinary insulating heat shrink tubing?
The two cannot be simply equated. The three-layer co-extrusion structure also considers insulation and electrical stress control requirements, and is more suitable for cable joints with specific electrical structural requirements.
