{"title":"4:1 Dual Wall Heat Shrink Tubing","description":null,"products":[{"product_id":"4-1-dual-wall-adhesive-lined-heat-shrink-tubing-high-shrink-ratio-waterproof-polyolefin-heatshrink-for-large-connectors-cable-splicing","title":"4:1 Dual-Wall Adhesive-Lined Heat Shrink Tubing | High-Shrink Ratio Waterproof Polyolefin Heatshrink for Large Connectors \u0026 Cable Splicing","description":"\u003cp\u003ePRODUCT OVERVIEW\u003c\/p\u003e\n\u003cp\u003eOur 4:1 ratio dual-wall adhesive-lined heat shrink tubing delivers the highest shrink ratio in our adhesive-lined product line, engineered specifically for applications involving large connectors, multi-conductor cable bundles, transition splices, and highly irregular geometries where 3:1 or 2:1 tubing cannot achieve full recovery. Constructed with a thick-walled cross-linked polyolefin outer jacket (UL VW-1 flame-retardant) and a generous hot-melt adhesive inner liner, this 4-to-1 tubing recovers to one quarter of its original diameter, creating a tight, uniform, and hermetically sealed bond.\u003c\/p\u003e\n\u003cp\u003eUpon heat activation, the heavy-gauge outer wall shrinks with exceptional force while the high-volume inner adhesive melts and flows, filling deep voids, encapsulating uneven surfaces, and bonding directly to the underlying cable jackets and substrates. The result is a durable, strain-relieved seal that resists water immersion, 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.\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: 4:1 (recovers to 1\/4 of original diameter)\u003cbr\u003e• Wall Construction: Dual-wall structure — heavy-gauge outer wall + high-volume adhesive liner\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► Exceptional 4:1 Shrink Ratio for Maximum Versatility\u003cbr\u003eThe 4-to-1 recovery ratio is the highest available in adhesive-lined heat shrink tubing, allowing a single size to span an exceptionally wide range of cable diameters. This makes it ideal for transition splices, large molded connectors, multi-cable bundles, and highly irregular shapes where 3:1 tubing still cannot achieve full circumferential contact.\u003c\/p\u003e\n\u003cp\u003e► High-Volume Adhesive Liner for Deep Void Filling\u003cbr\u003eThe thicker inner adhesive layer provides substantially more melt volume than standard 3:1 tubing, ensuring complete encapsulation of uneven surfaces, braided shields, and multi-conductor gaps. The adhesive flows under strong shrink pressure to create a 360° hermetic seal with IP67-equivalent moisture protection.\u003c\/p\u003e\n\u003cp\u003e► Heavy-Wall Construction for Superior Mechanical Protection\u003cbr\u003eThe thicker polyolefin outer wall delivers enhanced abrasion resistance, crush resistance, and impact protection — critical for wiring harnesses in heavy equipment, mining, off-road vehicles, and industrial environments where physical damage is a primary concern.\u003c\/p\u003e\n\u003cp\u003e► Robust Strain Relief \u0026amp; Vibration Resistance\u003cbr\u003eThe combined effect of high shrink force and deep adhesive penetration creates an exceptionally strong mechanical bond between the tubing and cable. This dramatically improves pull-out strength and flex fatigue performance, making it the preferred choice for high-vibration applications.\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 \u0026amp; UV 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\u003eTYPICAL APPLICATIONS\u003c\/p\u003e\n\u003cp\u003e🚜 Heavy Equipment \u0026amp; Off-Road Vehicles\u003cbr\u003e• Construction and mining equipment wiring harnesses\u003cbr\u003e• Agricultural machinery cable splices and repairs\u003cbr\u003e• Large-diameter battery cable terminal insulation\u003cbr\u003e• Multi-cable bundle transitions\u003c\/p\u003e\n\u003cp\u003e⚓ Marine \u0026amp; Shipboard Wiring\u003cbr\u003e• Multi-conductor navigation and communication cable sealing\u003cbr\u003e• Shipboard harness transitions through bulkheads\u003cbr\u003e• Saltwater-immersed sensor and transducer connections\u003cbr\u003e• Deck equipment and winch electrical junctions\u003c\/p\u003e\n\u003cp\u003e🏭 Industrial \u0026amp; Power Distribution\u003cbr\u003e• Motor lead and transformer cable terminations\u003cbr\u003e• Multi-wire control panel transition splices\u003cbr\u003e• Medium-voltage cable joint insulation and sealing\u003cbr\u003e• Conveyor system cable repairs\u003c\/p\u003e\n\u003cp\u003e🚋 Rail \u0026amp; Mass Transit\u003cbr\u003e• Rolling stock wiring harness transitions\u003cbr\u003e• Multi-conductor signal and control cable sealing\u003cbr\u003e• Underground and outdoor rail infrastructure connections\u003c\/p\u003e\n\u003cp\u003e☀️ Renewable Energy — Utility Scale\u003cbr\u003e• Solar farm combiner box cable transitions\u003cbr\u003e• Wind turbine tower cable bundle sealing\u003cbr\u003e• Inverter and transformer cable terminations\u003c\/p\u003e\n\u003cp\u003e📡 Broadband \u0026amp; Telecom Infrastructure\u003cbr\u003e• Multi-fiber and copper cable bundle sealing\u003cbr\u003e• Cell tower feeder cable transitions\u003cbr\u003e• Underground utility vault cable splices\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eINSTALLATION INSTRUCTIONS\u003c\/p\u003e\n\u003cp\u003eRequired Tools: Heat gun (minimum 350°C output, recommended 400–500°C for thick walls), 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. Due to the 4:1 ratio, allow a minimum overlap of 20–30 mm on each side of the splice or connector to ensure adequate seal length. 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. For large connectors, ensure the tubing can slide over the widest point before shrinking.\u003c\/p\u003e\n\u003cp\u003eStep 3 — Heat Application\u003cbr\u003eApply heat uniformly using a high-output heat gun set to 350–450°C. Begin heating from the center of the tubing and work progressively outward toward each end. The thicker wall requires longer heat exposure — maintain heat until the tubing has fully conformed and adhesive is visible at both ends. Keep the heat source moving to avoid localized overheating.\u003c\/p\u003e\n\u003cp\u003eStep 4 — Verification\u003cbr\u003eContinue heating until a generous, 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 bridging across gaps or irregular surfaces.\u003c\/p\u003e\n\u003cp\u003eStep 5 — Cooling \u0026amp; Inspection\u003cbr\u003eAllow the assembly to cool naturally (do not apply water or forced cooling as this may create voids). 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. For thick-wall 4:1 tubing, a variable-temperature heat gun with a reflector nozzle is strongly recommended.\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: 25m \/ 50m 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\u003cbr\u003e\u003c\/p\u003e","brand":"Juxinsheng InsulTech","offers":[{"title":"φ4.0 \/ Red","offer_id":46269102457066,"sku":null,"price":2.6,"currency_code":"USD","in_stock":true},{"title":"φ4.0 \/ Yellow","offer_id":46269102489834,"sku":null,"price":2.6,"currency_code":"USD","in_stock":true},{"title":"φ4.0 \/ Black","offer_id":46269102522602,"sku":null,"price":2.0,"currency_code":"USD","in_stock":true},{"title":"φ6.0 \/ Red","offer_id":46269102555370,"sku":null,"price":3.38,"currency_code":"USD","in_stock":true},{"title":"φ6.0 \/ Yellow","offer_id":46269102588138,"sku":null,"price":3.38,"currency_code":"USD","in_stock":true},{"title":"φ6.0 \/ Black","offer_id":46269102620906,"sku":null,"price":2.0,"currency_code":"USD","in_stock":true},{"title":"φ8.0 \/ Red","offer_id":46269102653674,"sku":null,"price":4.68,"currency_code":"USD","in_stock":true},{"title":"φ8.0 \/ Yellow","offer_id":46269102686442,"sku":null,"price":4.68,"currency_code":"USD","in_stock":true},{"title":"φ8.0 \/ Black","offer_id":46269102719210,"sku":null,"price":2.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/9798\/9866\/files\/1784185182212_cc61b278-730f-4abd-9fe9-3af7336f2a9c.jpg?v=1789099957"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/9798\/9866\/collections\/1784185182212_cc61b278-730f-4abd-9fe9-3af7336f2a9c.jpg?v=1789100258","url":"https:\/\/www.juxinson.com\/collections\/4x.oembed","provider":"Juxinsheng InsulTech","version":"1.0","type":"link"}