{"product_id":"dual-wall-adhesive-heat-shrink-tubing-4-1-ratio-4-6-8-12-16-20mm-cable-protection","title":"Dual Wall Adhesive Heat Shrink Tubing 4:1 – 4 to 20mm Sizes","description":"\n\u003ch2\u003eDual Wall Adhesive Heat Shrink Tubing – Professional Cable Protection\u003c\/h2\u003e\n\u003cp\u003eKeep your wiring secure, watertight, and insulated with this \u003cstrong\u003edual-wall heat shrink tubing with built-in adhesive glue lining\u003c\/strong\u003e. Featuring an impressive \u003cstrong\u003e4:1 shrink ratio\u003c\/strong\u003e, this tubing tightly conforms around irregular shapes, connectors, splices, and cable ends to create a robust, weatherproof seal every time. Available in multiple diameters — \u003cstrong\u003e4mm, 6mm, 8mm, 12mm, 16mm, and 20mm\u003c\/strong\u003e — there's a perfect size for virtually every wiring task.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose Dual-Wall Glue-Lined Heat Shrink?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4:1 Shrink Ratio:\u003c\/strong\u003e Shrinks down to one-quarter of its original diameter for a snug, custom fit on cables of varying sizes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Adhesive Glue Layer:\u003c\/strong\u003e When heated, the inner lining melts and flows to fill gaps, creating a moisture-resistant, airtight seal that single-wall tubing simply can't match.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical Insulation:\u003c\/strong\u003e Provides reliable insulation to protect cables, connectors, and splices from short circuits, abrasion, and environmental exposure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Size Range:\u003c\/strong\u003e Six diameter options (4mm, 6mm, 8mm, 12mm, 16mm, 20mm) to cover everything from delicate wire harnesses to heavy-duty power cables.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable PVC Construction:\u003c\/strong\u003e Built to withstand mechanical stress, vibration, and temperature fluctuations in both indoor and outdoor applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy to Use:\u003c\/strong\u003e Simply slide over cable, apply heat with a heat gun or lighter, and watch it shrink to form a professional-grade sleeve in seconds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomotive wiring harnesses and connector protection\u003c\/li\u003e\n  \u003cli\u003eMarine and outdoor electrical connections\u003c\/li\u003e\n  \u003cli\u003eHome and industrial electrical cable repair\u003c\/li\u003e\n  \u003cli\u003eSplicing and terminating wire bundles\u003c\/li\u003e\n  \u003cli\u003eProtecting cable ends from moisture, corrosion, and abrasion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShrink Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4:1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAvailable Diameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4mm, 6mm, 8mm, 12mm, 16mm, 20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePVC with inner hot-melt adhesive lining\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDual Wall, Heat Shrinkable\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInner Lining\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHot-melt adhesive glue (waterproof seal)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-scr-solid-state-relay-switch-module-dc3-24v-40a-optocoupler\"\u003e1-Channel SCR Solid State Relay Module DC3-24V 40A Optocoupler\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidelines on safe electrical wiring and insulation standards, refer to the U.S. Consumer Product Safety Commission – Electrical Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between dual-wall and single-wall heat shrink tubing?\u003c\/h4\u003e\n\u003cp\u003eA: Dual-wall heat shrink tubing has an outer PVC sleeve plus an inner layer of hot-melt adhesive glue. When heat is applied, the outer layer shrinks while the inner adhesive melts and flows around the cable, creating a waterproof, airtight seal. Single-wall tubing only shrinks but does not seal against moisture — making dual-wall the preferred choice for outdoor, marine, and automotive applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What shrink ratio does this heat shrink tubing have?\u003c\/h4\u003e\n\u003cp\u003eA: This dual-wall heat shrink tubing has a 4:1 shrink ratio, meaning it shrinks to one-quarter of its original inner diameter when heat is applied. This makes it highly versatile for securing cables and connectors of varying thicknesses across its available sizes (4mm, 6mm, 8mm, 12mm, 16mm, and 20mm).\u003c\/p\u003e\n\n\u003ch4\u003eQ: What tool do I use to shrink this tubing?\u003c\/h4\u003e\n\u003cp\u003eA: A standard heat gun is the recommended tool for best results and even shrinkage. In a pinch, a lighter or match can work for smaller diameters, but a heat gun gives you more consistent, professional results, especially with larger diameters like 16mm and 20mm.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this tubing suitable for outdoor or marine use?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The inner adhesive glue layer creates a moisture-resistant seal when properly applied, making this dual-wall heat shrink tubing well suited for outdoor wiring, automotive applications, and marine electrical connections where exposure to water and humidity is a concern.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between dual-wall and single-wall heat shrink tubing?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Dual-wall heat shrink tubing has an outer PVC sleeve plus an inner layer of hot-melt adhesive glue. 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