Dual Wall Adhesive Heat Shrink Tubing 3:1 & 4:1
Dual-wall heat shrink tubing with 3:1 and 4:1 shrink ratios and hot-melt adhesive liner. The higher recovery ratio accommodates larger dimensional differences and irregular shapes. The inner adhesive flows on heating to form a permanent, waterproof, strain-relieved seal.
Dual-wall heat shrink tubing with 3:1 and 4:1 shrink ratios and hot-melt adhesive liner. The higher recovery ratio accommodates larger dimensional differences and irregular shapes. The inner adhesive flows on heating to form a permanent, waterproof, strain-relieved seal.
Technical specifications
| Shrink ratio | 3:1 standard / 4:1 maximum (custom ratios available) |
| Wall structure | Dual-wall with hot-melt adhesive liner |
| Recovery temperature | 90-135 C (polyolefin), 200 C (fluoropolymer option) |
| Operating temperature | -55 C to +105 C continuous (-55 C to +200 C fluoropolymer) |
| Adhesive type | Hot-melt, zero-halogen option (LSZH) |
| Dielectric strength | >= 15 kV/mm (2:1 wall), >= 20 kV/mm (4:1 wall) |
| Flame retardancy | UL 94 V-0 (standard), LSZH optional |
| Standards | ASTM D2048, IEC 60228, UL 224, RoHS, REACH |
💾 Datasheets & Test Reports
Download the technical data sheet for this product (PDF).
Information required for quotation
| Base tube | Approved material grade, ID, OD, wall and conditioning as per drawing |
| Datums | Drawing datum scheme and measurement reference |
| Key dimensions | Feature positions, depths, pitch and diameters reviewed before quotation |
| Thread / profile | Standard or custom profile, class, depth, engagement and gage method |
| Other features | Holes, slots, steps, chamfers, cuts and marking |
| Acceptance | Tolerances, sampling, gages, FAI and inspection report |
| Order | Prototype and production quantity, packaging and delivery target |
Applications by industry
- Wire harness sealing in automotive and industrial equipment
- Irregular-shape cable bundle protection with high shrink ratio
- Moisture-sealed cable gland transitions outdoors
- Electrical submersible pump cable protection (350V+ systems)
- Control cabinet and junction box cable entry sealing
- Marine and offshore cable junction protection with strain relief
Why heat-shrink tubing for this application
Heat-shrink tubing provides environmental sealing and mechanical protection when shrunk over wire harnesses and connector assemblies. Recovery temperature determines application method.
Cannot be stretched back once recovered; UV degradation if exposed without additional protection. Not for continuous high-load mechanical situations.
Standards: ASTM D2048, IEC 60228, UL 224 (flame retardant), RoHS and REACH compliant.
Feature and remaining-wall review
Cut to length before installation; dual-wall adhesive lined requires controlled heat profile for proper flow. Review feature depth, edge distance and remaining wall against critical geometries. Capability is confirmed on your drawing, not from a blanket tolerance.
Inspection and traceability
We state the control plan with you. Batch traceability links raw material lot to finished part.
- First-article inspection (FAI) per your plan
- In-process dimensional checks at every station
- Batch certificate of conformance (COA) supplied on request
- Lot traceability to incoming material certificate
- Dielectric strength and insulation resistance testing available on request
Related components
Dual Wall Adhesive Heat Shrink Tubing 2:1
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0.6/1kV Cold Shrink Cable Accessories
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Flexible & Heat-Shrink Tubing Family
Related component from the WELLELE catalog.
Common questions
What shrink ratio is available?
Ratios from 2:1 to 4:1 depending on material and wall. Dual-wall adhesive-lined versions provide environmental sealing.
What recovery temperature is needed?
Standard polyolefin recovers at 90–135 °C. PTFE at 300–400 °C. Match the recovery temperature to your assembly heat profile.
Is it RoHS and REACH compliant?
Yes. All standard grades comply with RoHS 2011/65/EU and REACH 1907/2006. Certificates supplied per batch.
Can heat-shrink be printed?
Yes — identification bands, logos and warnings printed before or after shrink. Ask for print area and ink compatibility.
What wire sizes does it fit?
ID from 0.2 mm to 200 mm flat wall, 3 mm to 300 mm dual-wall. Refer to the sizing chart on the product page.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Dual Wall Adhesive Heat Shrink Tubing 3:1 & 4:1
Attach the drawing with annual volume. We check the material against your duty and tolerance, verify ID / OD / wall / features, and respond with manufacturability notes and pricing.