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China Suppliers Factory: High Temperature Resistant Double Wall Heat Shrink Tubing for Insulation and Sealing
Product Features
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◎ Superior Sealing & Waterproof Performance
The inner hot melt adhesive has a low melting point and strong adhesion. During heating and shrinkage, it melts to fully fill irregular gaps on the surface of the wrapped object, bonding firmly to various materials like plastic, rubber, and metal, achieving reliable waterproof, moisture-proof, and airtight sealing.
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◎ Excellent Insulation & Mechanical Protection
The outer radiation-crosslinked polyolefin material offers high insulation resistance, good flame retardancy (except for clear types), and high mechanical strength. The medium-wall design maintains a degree of flexibility while effectively enhancing overall protection against abrasion, cutting, and mechanical stress buffering.
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◎ Broad Temperature Range & Stable Shrinkage
The product maintains stable performance within a continuous operating temperature range of -45℃ to 125℃ (clear type: -45℃ to 105℃). The initial shrinkage temperature starts around 70℃ or above, with full shrinkage typically achieved at 125℃, ensuring a quick and even shrinking process.
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◎ Strong Environmental Adaptability
The structure adapts well to irregularly shaped objects. The crosslinked polymer material exhibits excellent resistance to chemical solvents, acids/alkalis, and aging, suitable for various complex environments.
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◎ Flexible Specifications & Environmental Safety
Available in multiple shrink ratios such as 2:1, 3:1, 4:1, etc., to fit cables and connectors of different sizes. The product complies with ROHS environmental standards, ensuring no release of hazardous substances.
Product Characteristics Parameter
| 3:1 Environmental Double Wall Heat Shrink Tube | ||
| Product Performance | Test Method | Performance Index |
| Tensile Strength（MPa） | ASTM D2671 | ≥12 |
| Breakage Elongation（%） | ASTM D2671 | ≥300 |
| Tensile Strength after Heat aging（MPa） | UL224 158℃× 168h | ≥7.3 |
| Breakage Elongation after heat aging (%) | UL224 158℃× 168h | ≥200 |
| Breakdown Strength (KV/mm) | UL224 | 2500V maintain 60S No breakdown |
| Volume Resistivity( Ω.m） | IEC 93 | ≥1×1014 |
| Operating Temperature Range | -45℃~125℃ | |
| Rated Voltage | 600V | |
| Shrinkage Temperature | Beginning Shrinkage Temperature 70℃, Lowest fully contracted Temperature 125℃, Shrinkage Operating Temperature 125℃~200℃ | |
| Shrinkage Ratio/Axial Shrinkage Ratio | Shrinkage Ratio 3:1 / Axial Shrinkage Ratio ≤±8% | |
| Environmental Performance | Compliant with the EU ROHS standards | |
| Standard Color | Black (Other Colors are available as per customization) | |
| Printing Content: E203950 us WOER SBRS TUBE (Φxx) | ||
| Material: (1) EVA; (2) Hot Melt Adhesive | ||
Hot Melt Adhesive Performance Parameter
| Hot Melt Adhesive Performance | ||
| Performance | Test Method | Performance Index |
| Water Absorption | ASTM-D570 | <0.2% |
| Softening Point | ASTM-E8 | 95℃ |
| Peel Strength (PE) | ASTM-D1000 | 120N/25m |
| Peel Strength (AL) | ASTM-D1000 | 80N/25m |
Product Specifications & Parameters
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◎ Structure & Material: Dual-layer structure. Outer layer: Radiation-crosslinked polyolefin; Inner layer: Hot melt adhesive.
◎ Standard Color: Black is standard. Clear or other special colors can be customized per customer request.
◎ Shrink Ratio: Available in various specifications like 2:1, 3:1, 4:1.
◎ Temperature Characteristics:
◎ Continuous Operating Temp.: -45℃ ~ +125℃ (standard); -45℃ ~ +105℃ (clear).
◎ Initial Shrinkage Temp.: ≥ 70℃.
◎ Full Shrinkage Temp.: ≥ 125℃.
◎ Physical & Electrical Properties: Excellent electrical insulation, flame retardancy (non-clear types), flexibility, and weather resistance.
◎ Environmental Certification: ROHS compliant.
Primary Application Fields
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◎ Automotive & Marine Manufacturing: Waterproofing, insulation, and vibration damping for engine wiring harnesses, sensor cables, and automotive electronic connectors.
◎ Power & Energy Engineering: Waterproof sealing and corrosion-resistant insulation for medium/low voltage power cable joints and terminations, connection protection for outdoor electrical equipment.
◎ Electronics, Appliances & Communications: Solder joint protection on PCB, wire harness bundling and identification, insulation encapsulation for components like resistors/capacitors, and cable splice protection in communication base stations.
◎ Industrial Equipment & Piping: Anti-corrosion wrapping for metal pipes and valves, sealing and mechanical buffering for pneumatic/hydraulic lines, abrasion protection for equipment cables.
◎ Consumer Products: Strain relief and insulation sealing at cable exits for internal wiring of household appliances and power adapters.
Installation & Usage Guide
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◎ Preparation:
• Ensure the surface of the cable or object to be wrapped is clean, dry, free of oil, and sharp burrs. Select the appropriate double-wall heat shrink tubing size based on the object's maximum diameter (the recovered inner diameter should be slightly smaller than the object's diameter).
◎ Installation Steps:
• Slide the double-wall heat shrink tubing over the desired location.
• Using a heat gun, oven, or other heating tool, apply heat evenly from the middle or one end, moving along the axis and circumference.
• Observe the tubing shrinking uniformly until it tightly conforms to the object. The inner adhesive should melt and slightly extrude from both ends, forming smooth sealing beads.
• Allow the tubing to cool and solidify naturally after heating.
◎ Precautions:
• Keep the heat gun moving continuously during heating to avoid localized overheating that could char the outer layer or carbonize the inner adhesive.
• Ensure the heating temperature reaches the full shrinkage requirement to allow the inner adhesive to melt completely for optimal sealing.
• Store the product in a cool, dry place away from direct sunlight and high temperatures.
Environmental Standard Parameter: Compliant with the EU ROHS Standards
| Environmental Material | Content (PPm) | Test Method |
| Cadmium (Cd) | ≤100 | IEC 62321/2ND CDV（111/95/CDV），ICP-OES |
| Plumbum (Pb) | ≤1000 | IEC 62321/2ND CDV（111/95/CDV），ICP-OES |
| Mercury (Hg) | ≤1000 | IEC 62321/2ND CDV（111/95/CDV），ICP-OES |
| Chromium (Cr) | ≤1000 | IEC 62321/2ND CDV（111/95/CDV），UV-Vis |
| PBB | ≤1000 | IEC 62321 |
| PBDE | ≤1000 | IEC 62321 |
Product Specification Sheet
| Specifications | Before Contraction Size (mm) | After Contraction Size (mm) | Package Standard | ||||||
| Inch | mm | Min. Inner Diameter (D) | Max. Inner Diameter (D) | Total Wall Thickness T+t (t) | Adhesive Layer Wall Thickness (t) | M/Tray | M/PC | ||
| 1/8 | φ3.2 | ≥3.2 | ≤1.00 | 0.90±0.30 | 0.40±0.20 | 200 | — | ||
| 3/16 | φ4.8 | ≥4.8 | ≤1.60 | 1.05±0.30 | 0.40±0.20 | 100 | — | ||
| 1/4 | φ6.4 | ≥6.4 | ≤2.20 | 1.25±0.30 | 0.45±0.20 | 100 | — | ||
| 5/16 | φ7.9 | ≥7.9 | ≤2.70 | 1.35±0.30 | 0.45±0.20 | 100 | — | ||
| 3/8 | φ9.5 | ≥9.5 | ≤3.20 | 1.45±0.30 | 0.50±0.20 | 50 | 1.22 | ||
| 1/2 | φ12.7 | ≥12.7 | ≤4.20 | 1.65±0.30 | 0.50±0.20 | — | 1.22 | ||
| 5/8 | φ15.0 | ≥15.0 | ≤5.20 | 1.80±0.30 | 0.55±0.30 | — | 1.22 | ||
| 3/4 | φ19.1 | ≥19.1 | ≤6.30 | 1.95±0.30 | 0.60±0.30 | — | 1.22 | ||
| 1 | φ25.4 | ≥25.4 | ≤8.50 | 2.00±0.40 | 0.60±0.30 | — | 1.22 | ||
| 5/4 | φ30.0 | ≥30.0 | ≤10.20 | 2.15±0.40 | 0.65±0.30 | — | 1.22 | ||
| 3/2 | φ39.0 | ≥39.0 | ≤13.50 | 2.45±0.40 | 0.75±0.30 | — | 1.22 | ||
| 2 | φ50.0 | ≥50.0 | ≤17.00 | 2.75±0.40 | 0.80±0.30 | — | 1.22 | ||
| 5/2 | φ64.0 | ≥64.0 | ≤21.00 | 3.05±0.40 | 1.05±0.30 | — | 1.22 | ||
| 3 | φ75.0 | ≥76.0 | ≤25.00 | 3.05±0.50 | 1.05±0.40 | — | 1.22 | ||
| 7/2 | φ90.0 | ≥90.0 | ≤30.00 | 3.10±0.50 | 1.05±0.40 | — | 1.22 | ||
| 4 | φ100.0 | ≥100.0 | ≤34.00 | 3.10±0.50 | 1.10±0.40 | — | 1.22 | ||
| 5 | φ125.0 | ≥125.0 | ≤42.00 | 3.15±0.50 | 1.10±0.40 | — | 1.22 | ||
Note
⚠ Other Sizes are available as per customization.
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Frequently Asked Questions (FAQ)
Q What is double wall heat shrink tubing and how does it differ from single wall tubing?
Double wall heat shrink tubing consists of two layers: an outer radiation-crosslinked polyolefin layer and an inner hot melt adhesive layer. When heated, the outer layer shrinks tightly around the object while the inner adhesive melts and flows to fill gaps, providing a waterproof and airtight seal. Single wall tubing only shrinks without the adhesive sealing function, making double wall tubing superior for moisture-sensitive and outdoor applications.
Q What shrink ratio options are available and how do I choose the right one?
The product is available in multiple shrink ratios including 2:1, 3:1, and 4:1. To choose the correct size, measure the maximum outer diameter of the cable or connector. The tubing's recovered inner diameter should be slightly smaller than the object's diameter for a tight seal. For objects with irregular shapes or larger diameter differences, a higher shrink ratio such as 3:1 or 4:1 is recommended.
Q What is the operating temperature range and at what temperature should I apply heat?
The standard product operates continuously from -45℃ to +125℃ (clear type: -45℃ to +105℃). Initial shrinkage begins at approximately 70℃ or above. For full and effective shrinkage with complete adhesive melting, a heating temperature of 125℃ to 200℃ is recommended. Always keep the heat gun moving to ensure even heat distribution and avoid localized overheating.
Q Is this product compliant with environmental and safety regulations?
Yes. The product fully complies with EU ROHS environmental standards. All restricted hazardous substances — including Cadmium (Cd), Lead (Pb), Mercury (Hg), Chromium (Cr), PBB, and PBDE — are controlled within the maximum allowable limits as verified by IEC 62321 and related test methods. The product does not release hazardous substances during normal use.
Q What materials can this heat shrink tubing bond to?
The inner hot melt adhesive provides strong adhesion to a wide range of materials including plastic, rubber, metal, and more. It is particularly effective for sealing cable connectors, wire harnesses, and pipe joints across industries such as automotive, marine, power, electronics, and industrial equipment.
Q Can I order custom sizes, colors, or special configurations?
Yes, customization is available. While the standard color is black, clear and other special colors can be produced upon request. Additionally, sizes beyond the standard specification sheet listings are available as per customer requirements. Please contact us with your specific dimensions and application details to receive an accurate quote.