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China Suppliers of Excellent Flame Retardancy PE Heat Shrink Tube - Quality Factory Manufactured
★ Features
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◎ Excellent Electrical Insulation
• Provides superior insulation, with a standard voltage rating of up to 600V, effectively preventing current leakage and short circuits.
• High dielectric strength meets the insulation requirements for most low to medium voltage electrical environments. -
◎ Good Flame Retardancy and Safety
• Products can achieve UL VW-1 or higher flame retardancy ratings through added flame retardants, being self-extinguishing and effectively slowing flame spread to enhance electrical safety.
• Some eco-friendly models ensure no harm to humans or the environment during use and disposal. -
◎ Broad Operating Temperature Range
• Standard models have a continuous operating temperature range from -55°C to +125°C, suitable for most indoor and outdoor temperature variations.
• High-temperature enhanced models can withstand up to +135°C or even +150°C, catering to applications in high-temperature environments like engine compartments. -
◎ Reliable Shrinkage and Mechanical Protection
• The standard shrinkage ratio is typically 2:1 (meaning the inner diameter halves after shrinking), ensuring a tight, uniform fit around objects of various shapes upon heating.
• After shrinkage, it provides good mechanical protection, enhancing the abrasion and cut resistance of wire harnesses and preventing corrosion on metal parts.
• The material is soft and elastic, facilitating bending and installation in complex routing situations. -
◎ Outstanding Environmental Compliance and Certifications
• Mainstream products comply with EU environmental directives such as ROHS and REACH, being free of harmful substances like lead, cadmium, and mercury.
• Certified by international safety standards like UL and CSA which fully satisfying export requirements. -
◎ Diverse Functional Designs
• In addition to standard single-wall tubing, dual-wall adhesive-lined tubing is available. The inner layer of hot-melt adhesive melts during shrinkage, providing excellent waterproofing, moisture resistance, and sealing, ideal for outdoor or humid environments.
• Available in various colors including black, red, yellow, green, and blue, facilitating circuit phase identification or product categorization.
★ Characteristics
Property |
Testing Condition |
Index |
| Physical: Tensile Strength | UL224 | ≥10.4Mpa/UL224 |
| Breakage Elongation | UL224 | ≥200% |
| Tensile Strength after aging | 158±1℃, 168hr/UL224 | ≥7.3Mpa/UL224 (Not smaller 70% than before aged) |
| Breakage Elongation after aging | 158±1℃, 168hr/UL224 | ≥100% Tensile Ratio |
| Heat Shock | 250℃, 1hr/UL224 | No cracking |
| Cold Bend | -30℃, 1hr/UL224 | No cracking |
| Electrical: Dielectric Voltage Withstand | 2500V, 60sec/UL224 | No breakdown |
| Volume resistivity | UL224 | ≥1014 Ω.cm |
| Chemical: Copper stability | 158±1℃, 168hr/UL224 | Pass |
| Flammability | VW-1/UL224 (within 15S, 60S self-extinguish) | Pass |
★ Applications
◎ Electronics, Electrical & Communications: Insulation protection and bundling for various wire harnesses and terminals; encapsulation of components like resistors, capacitors, and inductors; mechanical and electrical isolation of solder joints; antenna protection.
◎ Automotive Industry: Insulation protection for wiring harnesses in new energy and traditional vehicles; connection protection for battery modules; wrapping for sensor cables; waterproof sealing for cable joints.
◎ Power & Electrical: Insulation restoration for low-voltage cable joints and terminations; insulation protection for busbars; anti-corrosion coating for electrical hardware.
◎ Household Appliances: Insulation reinforcement and organization for internal power cords and motor leads.
◎ Military & Marine: Moisture-proof, mildew-proof, and insulation treatment for internal equipment cables; anti-corrosion protection for metal pipes and rods.
★ Usage and Selection Guide
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◎ Selection Steps
• Determine Size: Measure the maximum outer diameter of the object to be protected. Select a product with a pre-shrink inner diameter 20%–30% larger. Confirm the required final tightly-fitted inner diameter after shrinkage.
• Confirm Performance: Determine the required operating temperature rating, flame retardancy rating (e.g., VW-1), voltage rating, and whether waterproof sealing is needed (choose dual-wall adhesive-lined tubing) based on the application environment.
• Choose Color & Certification: Select color based on identification needs and confirm the product possesses the necessary safety and environmental certifications. -
◎ Shrinkage Process
• Tools: A heat gun, oven, or propane torch is recommended for even heating.
• Procedure: Slide the heat shrink tubing onto the object. Apply heat evenly from the middle towards the ends or from one end to the other. Avoid prolonged concentrated heat on one spot to prevent burning through or charring.
• Completion: Heating is complete when the tubing is fully shrunk, with a smooth, flat surface tightly conforming to the object without bubbles or wrinkles.
★ Product Specification Sheet
| Specification | Before Contraction (mm) | After Contraction (mm) | Packing (Length) M | Usage Range (mm) | ||
| Inner Diameter (D) | Avg Wall Thickness (r) | Inner Diameter (d) | Wall Thickness (t) | |||
| Φ0.6 | 0.9±0.2 | 0.15±0.03 | ≤0.40 | 0.28±0.06 | 400±3 | 0.4—0.7 |
| Φ0.7 | 0.9±0.2 | 0.15±0.03 | ≤0.45 | 0.28±0.06 | 400±3 | 0.5—0.7 |
| Φ0.8 | 1.1±0.2 | 0.15±0.03 | ≤0.50 | 0.30±0.06 | 400±3 | 0.6—0.8 |
| Φ1.0 | 1.5±0.2 | 0.18±0.03 | ≤0.60 | 0.36±0.08 | 400±3 | 0.75—0.9 |
| Φ1.5 | 2.0±0.3 | 0.18±0.03 | ≤0.85 | 0.36±0.08 | 400±3 | 0.95—1.4 |
| Φ2.0 | 2.5±0.3 | 0.20±0.04 | ≤1.00 | 0.40±0.08 | 400±3 | 1.1—1.8 |
| Φ2.5 | 3.0±0.3 | 0.20±0.04 | ≤1.25 | 0.40±0.08 | 400±3 | 1.35—2.3 |
| Φ3.0 | 3.5±0.4 | 0.20±0.04 | ≤1.5 | 0.40±0.08 | 400±3 | 1.6—2.7 |
| Φ3.5 | 4.0±0.4 | 0.22±0.04 | ≤1.75 | 0.44±0.08 | 400±3 | 1.85—3.2 |
| Φ4.0 | 4.5±0.4 | 0.25±0.04 | ≤2.0 | 0.50±0.08 | 400±3 | 2.1—3.6 |
| Φ4.5 | 5.0±0.4 | 0.25±0.04 | ≤2.25 | 0.50±0.08 | 200±2 | 2.35—4.0 |
| Φ5.0 | 5.5±0.4 | 0.25±0.04 | ≤2.5 | 0.50±0.08 | 200±2 | 2.6—4.5 |
| Φ5.5 | 6.0±0.4 | 0.25±0.04 | ≤2.75 | 0.50±0.08 | 200±2 | 2.8—5.5 |
| Φ6.0 | 6.5±0.4 | 0.28±0.04 | ≤3.0 | 0.55±0.08 | 200±2 | 3.1—5.4 |
| Φ6.5 | 7.0±0.4 | 0.28±0.04 | ≤3.25 | 0.55±0.08 | 100±1 | 3.2—6.0 |
| Φ7.0 | 7.5±0.4 | 0.28±0.04 | ≤3.5 | 0.55±0.08 | 100±1 | 3.7—6.3 |
| Φ8.0 | 8.5±0.5 | 0.28±0.04 | ≤4.0 | 0.60±0.10 | 100±1 | 4.2—7.2 |
| Φ9.0 | 9.5±0.5 | 0.30±0.05 | ≤4.5 | 0.60±0.10 | 100±1 | 4.7—8.0 |
| Φ10 | 10.5±0.5 | 0.30±0.05 | ≤5.0 | 0.60±0.10 | 100±1 | 5.2—9.0 |
| Φ11 | 11.5±0.5 | 0.30±0.05 | ≤5.5 | 0.60±0.10 | 100±1 | 5.7—10 |
| Φ12 | 12.5±0.5 | 0.30±0.05 | ≤6.0 | 0.60±0.10 | 100±1 | 6.2—11 |
| Φ13 | 13.5±0.5 | 0.35±0.06 | ≤6.5 | 0.70±0.10 | 100±1 | 6.7—12 |
| Φ14 | 14.5±0.5 | 0.35±0.06 | ≤7.0 | 0.70±0.10 | 100±1 | 7.3—13 |
| Φ15 | 15.5±0.5 | 0.40±0.08 | ≤7.5 | 0.75±0.10 | 100±1 | 7.8—14 |
| Φ16 | 16.5±0.5 | 0.40±0.08 | ≤8.0 | 0.75±0.10 | 100±1 | 8.3—15 |
| Φ17 | 17.5±0.5 | 0.40±0.08 | ≤8.5 | 0.75±0.10 | 100±1 | 8.8—16 |
| Φ18 | 19.0±0.7 | 0.40±0.08 | ≤9.0 | 0.75±0.10 | 100±1 | 9.3—17 |
| Φ20 | 21.0±0.7 | 0.40±0.08 | ≤10.0 | 0.75±0.10 | 100±1 | 10.4—19 |
| Φ22 | 23.0±0.7 | 0.40±0.08 | ≤11.0 | 0.80±0.10 | 100±1 | 11.4—21 |
| Φ25 | 26.0±0.7 | 0.50±0.10 | ≤12.5 | 0.90±0.10 | 50±0.5 | 12.8—24 |
| Φ28 | 29.0±0.7 | 0.50±0.10 | ≤14.0 | 0.90±0.10 | 50±0.5 | 14.4—29 |
| Φ30 | 31.0±0.7 | 0.50±0.10 | ≤15.0 | 0.95±0.10 | 50±0.5 | 16—29 |
| Φ35 | 36.0±0.7 | 0.50±0.10 | ≤17.5 | 1.00±0.12 | 50±0.5 | 18—34 |
| Φ40 | 41.0±0.7 | 0.55±0.10 | ≤20.0 | 1.00±0.12 | 50±0.5 | 21—39 |
| Φ45 | 46.0±0.7 | 0.55±0.10 | ≤22.5 | 1.00±0.12 | 25±0.5 | 23—44 |
| Φ50 | 51.0±0.7 | 0.55±0.10 | ≤25.0 | 1.00±0.12 | 25±0.5 | 26—49 |
| Size | Before Contraction (mm) | After Contraction (mm) | Packing (Length) M | Usage Range (mm) | ||
| Inner Diameter (D) | Avg Wall Thickness (r) | Inner Diameter (D) | Wall Thickness (t) | |||
| Φ0.6 | 0.9±0.2 | 0.15±0.03 | ≤0.40 | 0.28±0.06 | 400±3 | 0.4—0.7 |
| Φ0.7 | 0.9±0.2 | 0.15±0.03 | ≤0.45 | 0.28±0.06 | 400±3 | 0.5—0.7 |
| Φ0.8 | 1.1±0.2 | 0.15±0.03 | ≤0.50 | 0.30±0.06 | 400±3 | 0.6—0.8 |
| Φ1.0 | 1.5±0.2 | 0.18±0.03 | ≤0.60 | 0.36±0.08 | 400±3 | 0.75—0.9 |
| Φ1.5 | 2.0±0.3 | 0.18±0.03 | ≤0.85 | 0.36±0.08 | 400±3 | 0.95—1.4 |
| Φ2.0 | 2.5±0.3 | 0.20±0.04 | ≤1.00 | 0.40±0.08 | 400±3 | 1.1—1.8 |
| Φ2.5 | 3.0±0.3 | 0.20±0.04 | ≤1.25 | 0.40±0.08 | 400±3 | 1.35—2.3 |
| Φ3.0 | 3.5±0.4 | 0.20±0.04 | ≤1.5 | 0.40±0.08 | 400±3 | 1.6—2.7 |
| Φ3.5 | 4.0±0.4 | 0.22±0.04 | ≤1.75 | 0.44±0.08 | 400±3 | 1.85—3.2 |
| Φ4.0 | 4.5±0.4 | 0.25±0.04 | ≤2.0 | 0.50±0.08 | 400±3 | 2.1—3.6 |
| Φ4.5 | 5.0±0.4 | 0.25±0.04 | ≤2.25 | 0.50±0.08 | 200±2 | 2.35—4.0 |
| Φ5.0 | 5.5±0.4 | 0.25±0.04 | ≤2.5 | 0.50±0.08 | 200±2 | 2.6—4.5 |
| Φ5.5 | 6.0±0.4 | 0.25±0.04 | ≤2.75 | 0.50±0.08 | 200±2 | 2.8—5.5 |
| Φ6.0 | 6.5±0.4 | 0.28±0.04 | ≤3.0 | 0.55±0.08 | 200±2 | 3.1—5.4 |
| Φ6.5 | 7.0±0.4 | 0.28±0.04 | ≤3.25 | 0.55±0.08 | 100±1 | 3.2—6.0 |
| Φ7.0 | 7.5±0.4 | 0.28±0.04 | ≤3.5 | 0.55±0.08 | 100±1 | 3.7—6.3 |
| Φ8.0 | 8.5±0.5 | 0.28±0.04 | ≤4.0 | 0.60±0.10 | 100±1 | 4.2—7.2 |
| Φ9.0 | 9.5±0.5 | 0.30±0.05 | ≤4.5 | 0.60±0.10 | 100±1 | 4.7—8.0 |
| Φ10 | 10.5±0.5 | 0.30±0.05 | ≤5.0 | 0.60±0.10 | 100±1 | 5.2—9.0 |
| Φ11 | 11.5±0.5 | 0.30±0.05 | ≤5.5 | 0.60±0.10 | 100±1 | 5.7—10 |
| Φ12 | 12.5±0.5 | 0.30±0.05 | ≤6.0 | 0.60±0.10 | 100±1 | 6.2—11 |
| Φ13 | 13.5±0.5 | 0.35±0.06 | ≤6.5 | 0.70±0.10 | 100±1 | 6.7—12 |
| Φ14 | 14.5±0.5 | 0.35±0.06 | ≤7.0 | 0.70±0.10 | 100±1 | 7.3—13 |
| Φ15 | 15.5±0.5 | 0.40±0.08 | ≤7.5 | 0.75±0.10 | 100±1 | 7.8—14 |
| Φ16 | 16.5±0.5 | 0.40±0.08 | ≤8.0 | 0.75±0.10 | 100±1 | 8.3—15 |
| Φ17 | 17.5±0.5 | 0.40±0.08 | ≤8.5 | 0.75±0.10 | 100±1 | 8.8—16 |
| Φ18 | 19.0±0.7 | 0.40±0.08 | ≤9.0 | 0.75±0.10 | 100±1 | 9.3—17 |
| Φ20 | 21.0±0.7 | 0.40±0.08 | ≤10.0 | 0.75±0.10 | 100±1 | 10.4—19 |
| Φ22 | 23.0±0.7 | 0.40±0.08 | ≤11.0 | 0.80±0.10 | 100±1 | 11.4—21 |
| Φ25 | 26.0±0.7 | 0.50±0.10 | ≤12.5 | 0.90±0.10 | 50±0.5 | 12.8—24 |
| Φ28 | 29.0±0.7 | 0.50±0.10 | ≤14.0 | 0.90±0.10 | 50±0.5 | 14.4—29 |
| Φ30 | 31.0±0.7 | 0.50±0.10 | ≤15.0 | 0.95±0.10 | 50±0.5 | 16—29 |
| Φ35 | 36.0±0.7 | 0.50±0.10 | ≤17.5 | 1.00±0.12 | 50±0.5 | 18—34 |
| Φ40 | 41.0±0.7 | 0.55±0.10 | ≤20.0 | 1.00±0.12 | 50±0.5 | 21—39 |
| Φ45 | 46.0±0.7 | 0.55±0.10 | ≤22.5 | 1.00±0.12 | 25±0.5 | 23—44 |
| Φ50 | 51.0±0.7 | 0.55±0.10 | ≤25.0 | 1.00±0.12 | 25±0.5 | 26—49 |
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? Frequently Asked Questions
Q What is the standard shrink ratio of this heat shrink tubing, and how does it work?
The standard shrinkage ratio is 2:1, meaning the inner diameter reduces to half of its original size after heat is applied. When heated with a heat gun or oven, the tubing uniformly contracts and tightly conforms to the surface of wires, terminals, or components of various shapes, providing a secure, sealed fit.
Q What is the maximum operating temperature this heat shrink tubing can withstand?
Standard models support a continuous operating temperature range from -55°C to +125°C. High-temperature enhanced models can withstand up to +135°C or even +150°C, making them suitable for demanding environments such as automotive engine compartments and industrial equipment.
Q Is this heat shrink tubing waterproof? Which type should I choose for outdoor use?
Standard single-wall tubing provides basic insulation and mechanical protection but is not fully waterproof. For outdoor or humid environments, we recommend dual-wall adhesive-lined tubing. Its inner hot-melt adhesive layer melts during shrinkage, forming a fully sealed, waterproof barrier ideal for outdoor cable joints, marine, and military applications.
Q Does the product comply with international environmental and safety certifications?
Yes. Our heat shrink tubing complies with EU ROHS and REACH directives, containing no harmful substances such as lead, cadmium, or mercury. Products are certified to international safety standards including UL (UL224) and CSA, meeting global export requirements for electronics, automotive, and industrial sectors.
Q How do I select the correct size of heat shrink tubing for my application?
First, measure the maximum outer diameter of the object to be covered. Choose a tubing with a pre-shrink inner diameter approximately 20%–30% larger than that measurement. Then confirm the required shrunk inner diameter meets your final fitting requirement. For example, for an object with a 5mm diameter, select a tubing with a pre-shrink inner diameter of around 6–6.5mm.
Q What tools are needed to shrink the tubing, and what precautions should be taken?
A heat gun, oven, or propane torch can be used. Apply heat evenly from the center outward or from one end to the other to ensure uniform shrinkage. Avoid concentrating heat on one spot for too long, as this may burn or char the tubing. Shrinkage is complete when the surface is smooth, flat, and tightly fitted against the object with no bubbles or wrinkles.