{"title":"3:1 Dual Wall Heat Shrink Tubing","description":"\u003cp\u003e**Product Description**\u003cbr\u003e3:1 dual wall heat shrink tubing with hot-melt adhesive lining inside. Outer polyolefin layer provides insulation and abrasion resistance, inner adhesive melts while heating to create fully waterproof \u0026amp; airtight sealing.\u003cbr\u003ePerfect for cable waterproof repair, battery connection, marine and automotive wire harness. Flame retardant optional, meets UL, RoHS, REACH standards.\u003cbr\u003eOperating temperature: -45℃ ~125℃.\u003cbr\u003eMultiple sizes and colors in stock. Bulk discount, sample pack available. Custom length cutting acceptable.\u003c\/p\u003e\n\u003cp\u003e**Key Specifications**\u003c\/p\u003e\n\u003cp\u003e- Shrink Ratio:3:1\u003cbr\u003e- Material: Polyolefin outer + Hot melt adhesive inner\u003cbr\u003e- Working Temp: -45℃ ~125℃\u003cbr\u003e- Feature: Waterproof, sealed, corrosion resistance\u003cbr\u003e- Certifications: UL, RoHS, REACH, VW-1 optional\u003cbr\u003e- Application: Automotive wiring, marine cable, battery pack, waterproof cable joint\u003c\/p\u003e\n\u003cp\u003e**Meta Description**\u003cbr\u003e3:1 dual wall heat shrink tubing adhesive lined, waterproof cable sleeve. UL RoHS certified for automotive, marine and battery wire harness sealing, samples available.\u003c\/p\u003e\n\u003cp\u003e**Product Description**\u003cbr\u003e3:1 dual wall heat shrink tubing with hot-melt adhesive lining inside. Outer polyolefin layer provides insulation and abrasion resistance, inner adhesive melts while heating to create fully waterproof \u0026amp; airtight sealing.\u003cbr\u003ePerfect for cable waterproof repair, battery connection, marine and automotive wire harness. Flame retardant optional, meets UL, RoHS, REACH standards.\u003cbr\u003eOperating temperature: -45℃ ~125℃.\u003cbr\u003eMultiple sizes and colors in stock. Bulk discount, sample pack available. Custom length cutting acceptable.\u003c\/p\u003e\n\u003cp\u003e**Key Specifications**\u003c\/p\u003e\n\u003cp\u003e- Shrink Ratio:3:1\u003cbr\u003e- Material: Polyolefin outer + Hot melt adhesive inner\u003cbr\u003e- Working Temp: -45℃ ~125℃\u003cbr\u003e- Feature: Waterproof, sealed, corrosion resistance\u003cbr\u003e- Certifications: UL, RoHS, REACH, VW-1 optional\u003cbr\u003e- Application: Automotive wiring, marine cable, battery pack, waterproof cable joint\u003c\/p\u003e\n\u003cp\u003e**Meta Description**\u003cbr\u003e3:1 dual wall heat shrink tubing adhesive lined, waterproof cable sleeve. UL RoHS certified for automotive, marine and battery wire harness sealing, samples available.\u003c\/p\u003e","products":[{"product_id":"3-1-dual-wall-adhesive-lined-heat-shrink-tubing-marine-grade-waterproof-polyolefin-heatshrink-for-electrical-cable-splicing-sealing","title":"3:1 Dual-Wall Adhesive-Lined Heat Shrink Tubing | Marine-Grade Waterproof Polyolefin Heatshrink for Electrical Cable Splicing \u0026 Sealing","description":"\u003cp\u003ePRODUCT OVERVIEW\u003c\/p\u003e\n\u003cp\u003eOur 3:1 ratio dual-wall adhesive-lined heat shrink tubing is engineered for demanding electrical and environmental sealing applications where standard 2:1 tubing fails to deliver adequate coverage. Constructed with a cross-linked polyolefin outer jacket (UL VW-1 flame-retardant) and a thermoplastic hot-melt adhesive inner liner, this tubing provides a 3-to-1 shrink ratio, enabling it to conform tightly around large connectors, splices, and irregular cable geometries while delivering a hermetic, moisture-proof seal.\u003c\/p\u003e\n\u003cp\u003eUpon heat activation, the outer wall shrinks uniformly while the inner adhesive melts and flows, encapsulating the substrate and forming a durable, strain-relieved bond that resists water ingress, corrosion, vibration, and mechanical abrasion. Rated for continuous operation from -55°C to +125°C, the polyolefin outer wall meets UL 224 VW-1 flammability requirements and the assembly is fully RoHS and REACH compliant — making it suitable for marine, automotive, industrial control, and renewable energy installations.\u003c\/p\u003e\n\u003cp\u003eImportant Note: The UL 224 VW-1 flammability rating applies specifically to the outer polyolefin wall. The inner hot-melt adhesive layer is not flame-retardant and is designed primarily for environmental sealing and mechanical bonding. In applications requiring full assembly flame resistance, please verify suitability for your specific use case.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eKEY TECHNICAL SPECIFICATIONS\u003c\/p\u003e\n\u003cp\u003e• Shrink Ratio: 3:1 (recovers to 1\/3 of original diameter)\u003cbr\u003e• Wall Construction: Dual-wall structure\u003cbr\u003e  - Outer Wall: Cross-linked flame-retardant polyolefin (UL VW-1)\u003cbr\u003e  - Inner Liner: Hot-melt thermoplastic adhesive (non-flame-retardant)\u003cbr\u003e• Operating Temperature Range: -55°C to +125°C (continuous)\u003cbr\u003e• Shrink Initiation Temperature: ≥ 70°C\u003cbr\u003e• Full Recovery Temperature: 125°C\u003cbr\u003e• Dielectric Strength: ≥ 15 kV\/mm (ASTM D2671)\u003cbr\u003e• Dielectric Constant: ≤ 2.8 @ 1 MHz\u003cbr\u003e• Volume Resistivity: ≥ 1×10¹⁴ Ω·cm\u003cbr\u003e• Outer Wall Flammability: UL 224 VW-1 (vertical burn) — outer polyolefin layer only\u003cbr\u003e• Tensile Strength: ≥ 10.4 MPa (ASTM D2671)\u003cbr\u003e• Elongation at Break: ≥ 200%\u003cbr\u003e• Water Absorption: ≤ 0.5%\u003cbr\u003e• Copper Corrosion: Passes ASTM D2671\u003cbr\u003e• Fluid Resistance: Resistant to diesel, gasoline, hydraulic fluids, and mild acids\u003cbr\u003e• Certifications: UL Recognized (outer wall), RoHS 3.0, REACH SVHC Compliant\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003ePERFORMANCE ADVANTAGES\u003c\/p\u003e\n\u003cp\u003e► Superior Conformability with 3:1 Recovery\u003cbr\u003eThe 3-to-1 shrink ratio allows a single tubing size to cover a wider range of cable diameters and large-diameter connectors — reducing SKU count and simplifying inventory management. Ideal for transition splices, molded connectors, and irregularly shaped components where 2:1 tubing cannot achieve full recovery.\u003c\/p\u003e\n\u003cp\u003e► Hermetic Environmental Sealing\u003cbr\u003eThe internal hot-melt adhesive liner melts at approximately 80°C and flows under shrink pressure, filling voids and bonding directly to the cable jacket and underlying substrate. The resulting seal provides IP67-equivalent moisture protection, preventing water intrusion, salt spray corrosion, and dust contamination in outdoor and submerged applications.\u003c\/p\u003e\n\u003cp\u003e► Enhanced Mechanical Strain Relief\u003cbr\u003eThe bonded adhesive layer creates a unified structure between the tubing and the cable, distributing mechanical stress across the splice junction. This significantly improves pull-out resistance and flex fatigue performance compared to non-adhesive tubing, extending service life in high-vibration environments.\u003c\/p\u003e\n\u003cp\u003e► Flame-Retardant Outer Layer\u003cbr\u003eThe polyolefin outer wall is formulated with flame-retardant additives and meets UL 224 VW-1 vertical burn requirements, ensuring compliance with NEC and international electrical safety standards for enclosed and industrial installations. Note: The inner adhesive layer is non-flame-retardant and contributes to sealing performance only.\u003c\/p\u003e\n\u003cp\u003e► Long-Term Thermal Stability\u003cbr\u003eThe cross-linked molecular structure of the outer wall provides excellent resistance to thermal aging, UV degradation, and thermal cycling — maintaining dielectric and mechanical integrity throughout the product's service life across the full -55°C to +125°C operating range.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eINDUSTRY APPLICATIONS\u003c\/p\u003e\n\u003cp\u003e⚓ Marine \u0026amp; Offshore\u003cbr\u003e• Boat wiring harnesses and navigation system splices\u003cbr\u003e• Bilge pump and transducer cable sealing\u003cbr\u003e• Saltwater-exposed electrical connections\u003cbr\u003e• Dockside and offshore platform instrumentation\u003c\/p\u003e\n\u003cp\u003e🚗 Automotive \u0026amp; Heavy-Duty Vehicles\u003cbr\u003e• Engine bay wiring and sensor connections\u003cbr\u003e• Trailer and towing harness repairs\u003cbr\u003e• Battery cable splices and terminal insulation\u003cbr\u003e• Off-road and agricultural equipment wiring\u003c\/p\u003e\n\u003cp\u003e🏭 Industrial \u0026amp; Automation\u003cbr\u003e• PLC and control cabinet wiring\u003cbr\u003e• Motor lead and transformer connections\u003cbr\u003e• Conveyor and sensor cable splicing\u003cbr\u003e• Outdoor LED lighting and signage\u003c\/p\u003e\n\u003cp\u003e☀️ Renewable Energy\u003cbr\u003e• Solar panel string wiring and junction box connections\u003cbr\u003e• Wind turbine cable terminations\u003cbr\u003e• Inverter and charge controller wiring\u003c\/p\u003e\n\u003cp\u003e📡 Telecom \u0026amp; Data Infrastructure\u003cbr\u003e• Cell tower and base station cable sealing\u003cbr\u003e• Fiber optic buffer tube protection\u003cbr\u003e• Outdoor Ethernet and PoE cable splices\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eINSTALLATION INSTRUCTIONS\u003c\/p\u003e\n\u003cp\u003eRequired Tools: Heat gun (minimum 300°C output), heat-resistant gloves, utility knife or tubing cutter\u003c\/p\u003e\n\u003cp\u003eStep 1 — Preparation\u003cbr\u003eCut tubing to length using a sharp blade or tubing cutter. Ensure a minimum overlap of 15–20 mm on each side of the splice or connector. Deburr cut edges to prevent tearing during recovery.\u003c\/p\u003e\n\u003cp\u003eStep 2 — Placement\u003cbr\u003eSlide the tubing over the cable and position it centrally over the splice, joint, or termination point before making the electrical connection.\u003c\/p\u003e\n\u003cp\u003eStep 3 — Heat Application\u003cbr\u003eApply heat uniformly using a heat gun set to 300–350°C. Begin heating from the center of the tubing and work progressively outward toward each end. Maintain sufficient distance to avoid scorching while ensuring the adhesive reaches flow temperature.\u003c\/p\u003e\n\u003cp\u003eStep 4 — Verification\u003cbr\u003eContinue heating until a continuous bead of adhesive extrudes from both ends of the tubing, confirming complete adhesive flow and a circumferential seal. The tubing should conform smoothly to the underlying profile with no wrinkles or bridging.\u003c\/p\u003e\n\u003cp\u003eStep 5 — Cooling \u0026amp; Inspection\u003cbr\u003eAllow the assembly to cool naturally. Inspect for full recovery, uniform adhesive coverage, and absence of voids or air bubbles. A properly installed joint will be rigid at the adhesive bond line with no movement under lateral stress.\u003c\/p\u003e\n\u003cp\u003eNote: Use of open-flame torches is not recommended for precision installations as localized overheating can degrade the adhesive and polyolefin material, compromising seal integrity.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eQUALITY ASSURANCE \u0026amp; COMPLIANCE\u003c\/p\u003e\n\u003cp\u003e• Manufactured under ISO 9001:2015 certified quality management systems\u003cbr\u003e• Each production lot undergoes dimensional verification, shrink ratio testing, and dielectric breakdown testing\u003cbr\u003e• Material traceability available upon request for qualified industrial customers\u003cbr\u003e• Custom lengths, colors, and printed marking available for volume orders (MOQ applies)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003ePACKAGING OPTIONS\u003c\/p\u003e\n\u003cp\u003e• Bulk Spools: 30m \/ 50m \/ 100m continuous lengths on plastic spools\u003cbr\u003e• Cut Pieces: Pre-cut segments in assorted lengths (customizable)\u003cbr\u003e• Kit Assortments: Multi-diameter organizer kits for service technicians\u003cbr\u003e• Private Label: Custom branding and packaging available for OEM and resale partners\u003c\/p\u003e","brand":"Juxinsheng InsulTech","offers":[{"title":"φ1.6 \/ Black","offer_id":46269008740586,"sku":null,"price":0.9,"currency_code":"USD","in_stock":true},{"title":"φ1.6 \/ White","offer_id":46269008773354,"sku":null,"price":1.1,"currency_code":"USD","in_stock":true},{"title":"φ1.6 \/ Blue","offer_id":46269008806122,"sku":null,"price":1.1,"currency_code":"USD","in_stock":true},{"title":"φ2.4 \/ Black","offer_id":46269008838890,"sku":null,"price":0.7,"currency_code":"USD","in_stock":true},{"title":"φ2.4 \/ White","offer_id":46269008871658,"sku":null,"price":0.95,"currency_code":"USD","in_stock":true},{"title":"φ2.4 \/ Blue","offer_id":46269008904426,"sku":null,"price":0.95,"currency_code":"USD","in_stock":true},{"title":"φ3.2 \/ Black","offer_id":46269008937194,"sku":null,"price":0.78,"currency_code":"USD","in_stock":true},{"title":"φ3.2 \/ White","offer_id":46269008969962,"sku":null,"price":1.0,"currency_code":"USD","in_stock":true},{"title":"φ3.2 \/ Blue","offer_id":46269009002730,"sku":null,"price":1.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/9798\/9866\/files\/3X4X.jpg?v=1789097955"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/9798\/9866\/collections\/3X4X.jpg?v=1789099772","url":"https:\/\/www.juxinson.com\/collections\/frontpage.oembed","provider":"Juxinsheng InsulTech","version":"1.0","type":"link"}