Heat Shrinkable Tube
A Heat Shrinkable Tube, also known as heat shrink tubing, is a specially engineered polymer tube that contracts when exposed to heat, providing excellent insulation, sealing, and mechanical protection for wires, cables, connectors, and electronic components. It is widely used across electronics, automotive wiring, electrical engineering, energy systems, and various industrial applications due to its durability, flexibility, and ease of installation.
What Is a Heat Shrinkable Tube?
A Heat Shrinkable Tube is made from cross-linked polyolefin or other modified polymers. When heated to a specific temperature (typically with a heat gun), the tube shrinks tightly around the substrate, forming a protective layer against moisture, abrasion, chemicals, and electrical interference.
Heat shrink tubes come in various shrink ratios such as:
2:1 Heat Shrink Tubing (most common)
3:1 Heat Shrink Tubing
4:1 High-Ratio Heat Shrink Tubing
Specialized Adhesive-Lined Heat Shrink Tubing for waterproof sealing
These ratios indicate how much the tube can shrink from its original diameter.
Key Features of Heat Shrinkable Tubes
1. Excellent Electrical Insulation
Provides stable dielectric strength, preventing electrical short circuits and improving wiring safety.
2. Strong Mechanical Protection
Protects cables from abrasion, bending fatigue, and external impact, extending the life of wiring systems.
3. Heat, Chemical & Corrosion Resistance
The cross-linked material resists heat, oils, solvents, and chemicals—suitable for harsh industrial environments.
4. Waterproof & Dustproof (With Adhesive Lining)
Dual-wall heat shrink tubes include an inner adhesive that melts during heating to form a tight seal against moisture and contaminants.
5. Wide Temperature Tolerance
Most polyolefin heat-shrink tubes operate between -55°C to +125°C, with special high-temperature versions up to 200°C.
6. Easy Installation
Shrinks quickly using a heat gun; no need for complex tools or extra components.
Typical Applications
Heat Shrinkable Tubes are commonly used in:
Electrical wire insulation
Cable bundling and identification
Automotive wiring harness protection
Battery connections and terminals
PCB solder joint covering
Waterproof sealing for outdoor cables
Fiber optic splice protection
Aerospace and military equipment wiring
Audio & home appliance cable organization
Whether for small DIY repairs or professional industrial applications, heat shrink tubing is a reliable solution for cable management and protection.
Types of Heat Shrinkable Tubes
1. Polyolefin Heat Shrink Tube
Most widely used, offering excellent insulation and flexibility.
2. Adhesive-Lined (Dual Wall) Heat Shrink Tube
Provides waterproof sealing and enhanced mechanical strength.
3. PVC Heat Shrink Tube
Good for labeling, color coding, and low-voltage applications.
4. High Temperature Heat Shrink Tube
Made from fluoropolymers (e.g., FEP, PTFE), suitable for extreme environments.
5. Flame Retardant Heat Shrink Tube
Meets UL flame-rating standards for enhanced safety.
6. Special Color & Print Heat Shrink Tube
Used for identification in wiring harnesses and network cables.
Why Choose Our Heat Shrinkable Tubes
As a professional heat shrinkable tube manufacturer, we offer:
Wide Size & Color Options
Diameters from 1.0 mm to 150 mm, available in black, red, yellow, green, blue, transparent, and custom colors.
Multiple Shrink Ratios
2:1, 3:1, 4:1, and custom ratios for different engineering needs.
High-Quality Materials
Made from premium cross-linked polyolefin or fluoropolymers to ensure durability and long-term reliability.
Custom Lengths & Printing
Support OEM/ODM, including logos, wire identification codes, and custom-cut lengths.
Certification Support
RoHS, UL, REACH, SGS available upon request.
✔ Bulk Supply with Fast Delivery
Suitable for wholesalers, distributors, electrical manufacturers, and wiring harness factories.