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Heat Shrink Tube

Your Professional Heat Shrink Tube Supplier
 

Hangzhou Weshare Import & Export Co.,Ltd. is a leading Chinese manufacturer and exporter of transformer components, electrical insulation materials and consulting company. Weshare founded in 2005 by one specialized sales in transformer accessories. Most of our products are used in oil and dry transformers, electrical motors, generators and electronic products.Our mission is to ensure appropriate product quality while satisfying the needs of our customers is our prime objective and represents the core principle of our business activities.

 

 
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Why Choose Us

Quality Assurance

Certified by UL, SGS, and ISO9001, Weshare upholds stringent quality standards.

Extensive Experience

Weshare, since 2005, excels in transformer accessories and electrical engineering.

Export markets

With a strong focus on export markets, we have successfully captured significant market share in East Asia, North Europe, the Middle East, South America, Egypt, and East Africa. Our dedication to ensuring appropriate product quality while meeting customer needs is the cornerstone of our business philosophy.

Product Application

Our company boasts a wide array of products used in oil and dry transformers, electrical motors, generators, and electronic devices.

 

 

 

Advantages of Heat Shrink Tube
 

Protection
One of the prime benefits of heat shrink tubing is the protection offered to wires and cables when exposed to a variety of conditions and environments. In factories and manufacturing plants, wires and cables are subject to abrasion, scuffing, splitting, and constant wear when left exposed.

 

Insulation Properties
Insulation of electrical wires and cables is first and foremost required to prevent electrical shock. However, the insulation of wires and cables also prevents the loss and dissipation of energy being conducted through the wiring. The material properties of cable insulators are non-conductive and designed to provide a buffer with anyone or anything that may come in contact with the cabling.

 

Reduces Cable Stress
Though heat shrink tubing offers protection for cabling and wiring from exposure to environmental conditions, it also aids in preventing undue strain or stretching of wires and cables confined to insufficient space or length. Heat shrinking increases mechanical support for maintaining connectivity of wires and cables that otherwise would be subjected to strain and stress that could lead to premature failure.

 

Organization
There may be no better argument for the application of heat shrink tubing of wires, cabling, and components than to organize them. Bundling wires and cables are not only aesthetically pleasing, but good cable management allows for easy access during maintenance of the system.

 

Corrosion Resistance
Over time, in any environment, when oxygen combines with the metal it forms a new compound called oxide that weakens the bonds of the metal itself, causing it to corrode. Metals and their alloys used in wiring and cable applications can be made corrosion-resistant, but only insulating the material can ensure against corrosion.

 

Heat Shrink Tubing Materials

 

Heat Shrink Sleeve

Polyolefin

Polyolefin is the most popular material for shrink tubing due to its thermal resistance. It is more expensive than PVC but capable of withstanding temperatures as high as 125-135°C. This property makes it ideal for manufacturing, industrial, and mechanical applications with high operating temperatures.

Protector Shrink Sleeve Insulation

Adhesive-Lined Polyolefin

To provide a more secure tube that will not slip in critical conditions, manufacturers have created a polyolefin heat shrink tubing with an adhesive inner layer that melts and adheres to the wires and components inside the tube to fill voids and ensure a close fit. An added adhesive offers more support and increased protection from moisture and harsh conditions.

High Temp Heat Shrink

PVC

PVC is less expensive than polyolefin but has a lower temperature threshold of approximately 105°C. PVC is durable, strong, and highly abrasion-resistant. It can be manufactured with high clarity, bright colors, and flame-retardant qualities, making it a highly versatile and cost-effective option for low-temperature applications.

 

Types of Heat Shrink Tube

Polyolefin is the most common kind of heat shrink material, in part because its properties make it a great choice for most applications. It comes in a variety of colors. Shrink temperature is 120° C (229° F), and the material can perform continuously between temperatures of -55° C to +135° C (-67° F to +275° F).

 

Fabric heat shrink is a woven blend of materials, a combination of polyolefin and polyester. The woven structure makes it highly flexible while allowing it to retain strength and abrasion resistance. It has a low shrink temperature, 80° C (176° F), but a narrower range of operating temperatures, -40° C to +125° C (-40° F to +270° F). It also shrinks more longitudinally (lengthwise) than other heat shrinks.

 

Polyvinylchloride (PVC) is often used as a low-cost alternative to other heat-shrink materials. As an inert material, it’s good for food and drink applications. Its high UV resistance makes it a great choice for exposed applications. However, it does have some limitations, such as sensitivity to high temperatures. The shrink temperature for PVC is 100° C (212° F), and the range of operating temperatures is -55° C to 105° C (-67° F to +221° F). We do not ship this material without written authorization during the warmer months because of its heat sensitivity.

 

Polytetrafluoroethylene (PTFE AKA Teflon) is heat shrink tubing used when an application requires a high-temperature operation. PTFE tubing can operate safely at temperatures ranging from -67° C to +250° C (-88° F to +482° F). The shrink temperature of 340° C (644° F) also makes it hard for most people to use this material in standard applications.

 

Paramenters

 

Property

Test method

Standard

Typical Performance

Tensile strength(MPa)

ASTM D2671

≥10.4

12.68

Elongation(%)

ASTM D2671

≥200

448.72

Tensile strength after aging(MPa)

UL224 158℃X168hr

≥7.3

11.45

Elongation after aging (%)

UL224 158℃X168hr

≥100

390.41

Flammability

ASTM D2671B

Pass

Pass

Dielectric strength(kV/mm)

IEC 60243

≥15

18.25

Volume resistivity(Ω.cm)

IEC 60093

≥1X1014

1.86X1014

 

巨型热缩管

 

Steps Of Heat Shrink Tubing Production

Material Selection: The process begins with choosing base polymers like polyethylene (PE), polyvinylidene fluoride (PVDF), or elastomers. Additives (e.g., stabilizers, colorants) are blended to enhance properties like UV resistance or flame retardancy.

 

Extrusion: The polymer mix is melted and extruded through a circular die to form a tube. Precise temperature control ensures uniform thickness and smooth surfaces. The extruded tube is cooled in water baths to solidify its initial shape.

 

Cross-Linking: To enable heat-shrink capabilities, the tubing undergoes cross-linking via electron beam irradiation or chemical methods. This creates molecular bonds, improving thermal stability and mechanical strength.

 

Expansion: The tube is reheated to a rubbery state and mechanically or pneumatically stretched to a larger diameter. It is then rapidly cooled (quenched) to “lock” the expanded shape.

 

Finishing: The tubing is cut to specified lengths, inspected for defects (e.g., dimensional accuracy, shrinkage ratio), and tested for electrical/mechanical performance. Surface printing or labeling may be added.

 

Packaging: Finished tubes are coiled or packed for shipment, often with anti-static or moisture-resistant measures.

 

Application of Heat Shrink Tube

 

Electrical Insulation

Covers exposed wires and connectors, preventing short circuits and enhancing safety by providing a non-conductive barrier.

01

Strain Relief

Reduces mechanical stress on electrical connections, protecting them from bending or pulling forces that could lead to failure.

02

Environmental Protection

Shields from external elements such as moisture, chemicals, and UV exposure, making it ideal for outdoor and harsh environments.

03

Wire Bundling

Organizes multiple wires into a single, manageable group, reducing clutter and improving overall cable management.

04

Identification

Utilized for labeling and color-coding wires, which simplifies circuit management and troubleshooting tasks.

05

 

FAQ

 

Q: Is heat shrink tubing necessary?

A: Heat shrink tubing is an essential part of the majority of residential electrical setups, and the process of heat shrinking is crucial for ensuring a secure fit.

Q: How long does heat shrink tubing last?

A: 10 to 30 years. The longevity of heat shrink tubing depends on the material type, environmental conditions, and installation practices. In optimal conditions, heat shrink tubing can last from 10 to 30 years or more, but outdoor exposure, frequent mechanical stress, or chemical exposure can reduce its lifespan.

Q: Is heat shrink waterproof?

A: Marine grade heat shrink tubing is adhesive lined, meaning it creates a reliable waterproof seal.

Q: Is heat shrink tubing strong?

A: These specialized plastics are also durable, moldable, and handle additives incredibly well. Additions to heat shrink tubing can include adhesive inner liners (also called dual-wall), chemical or corrosive resistances, and fluorination.

Q: What is the best heat source for heat shrink tubing?

A: A hot air gun is a preferred heating tool for applying custom logo heat shrink tubing. Unlike open flames, heat guns offer adjustable temperature settings.

Q: How much heat is required for heat shrink tubing?

A: However, most standard heat shrink tubing typically starts to contract at temperatures between 90°C to 120°C (194°F to 248°F). The tubing will continue to shrink until it reaches its fully shrunken state, which is typically achieved at slightly higher temperatures.

As one of the leading heat shrink tube suppliers in China, we warmly welcome you to wholesale high-grade heat shrink tube made in China here from our factory. All our products are with high quality and competitive price.