{"product_id":"3-1-ratio-heat-shrink-tubing-black-electrical-sleeving","title":"3:1 Ratio Heat Shrink Tubing – Black Electrical Wire Sleeving (Without Glue)","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3:1 Ratio Heat Shrink Tubing — Reliable Black Electrical Wire Sleeving for Every Job\u003c\/h2\u003e\n\u003cp\u003eElectricians, automotive technicians, and serious DIYers know the frustration of standard 2:1 tubing that won't grip irregular bundles or larger connectors. This 3:1 ratio black heat shrink tubing closes that gap — shrinking down to one-third of its original diameter for a firm, professional-looking finish on wires, splices, terminals, and cable harnesses of all sizes.\u003c\/p\u003e\n\u003cp\u003eEach order covers a single continuous length of tubing in your chosen inside diameter and cut length. Inside diameters range from φ1.5mm (≈0.06\") to φ50mm (≈1.97\"), and lengths are available from 1 meter (≈3.3 ft) up to 50 meters (≈164 ft). The tubing is made from flame-retardant polyolefin in a matte black finish, sold without adhesive lining for clean, flexible installations.\u003c\/p\u003e\n\u003cp\u003eTypical applications include automotive wiring harness repair, marine electrical connections, home electrical panel work, and workshop tool cord management — anywhere you need a heat shrink wire sleeve that conforms tightly and stays put. The wide size range also makes it a go-to for bundling and labeling cables in server racks or control panels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003eℹ️\u003c\/span\u003e Compatible with standard heat guns. Suitable for copper, aluminum, and stranded wire. Fits AWG wire sizes from approximately 28 AWG (φ1.5mm) to large cable bundles (φ50mm). Not compatible with adhesive-required applications — this is a non-glue tubing.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 3:1 Heat Shrink Tubing Sleeves\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTrue 3:1 Shrink Ratio\u003c\/strong\u003e — Shrinks to approximately one-third of its original inside diameter, gripping irregular shapes, stepped connectors, and large bundles that standard 2:1 tubing cannot handle.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlame-Retardant Polyolefin Material\u003c\/strong\u003e — Meets typical UL224 and RoHS standards for flame resistance, making it suitable for automotive, marine, and industrial electrical sleeving applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Diameter Range (φ1.5mm–φ50mm)\u003c\/strong\u003e — One product line covers everything from fine instrument wires to large cable harnesses, reducing the need to stock multiple SKUs for different heat shrink wire wrap jobs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🌡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBroad Operating Temperature Range\u003c\/strong\u003e — Generally rated from approximately -55°C to +125°C (-67°F to +257°F), handling engine bay heat, outdoor UV exposure, and cold-weather installations without cracking or softening.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCut-to-Length Flexibility\u003c\/strong\u003e — Available in continuous rolls from 1 to 50 meters, so you can cut exactly what you need for each splice or terminal — no waste, no pre-cut limitations.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eElectrical Insulation \u0026amp; Abrasion Protection\u003c\/strong\u003e — Provides a secondary layer of dielectric insulation over wire splices and terminals, protecting against short circuits, chafing, and moisture ingress in automotive and DIY wiring projects.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 3:1 Heat Shrink Tubing\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e3:1 (without adhesive lining)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInside Diameter (Before Shrink)\u003c\/th\u003e\n\u003ctd\u003eφ1.5mm (≈0.06\") — φ50mm (≈1.97\"); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1 m (≈3.3 ft) — 50 m (≈164 ft); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eFlame-retardant polyolefin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack (matte)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically begins at ~70–90°C (158–194°F); full recovery at ~120°C (248°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically -55°C to +125°C (-67°F to +257°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdhesive Lining\u003c\/th\u003e\n\u003ctd\u003eNone (non-adhesive \/ without glue)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlame Rating\u003c\/th\u003e\n\u003ctd\u003eFlame-retardant (typically meets UL224 VW-1); contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWall Thickness (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm by size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompliance\u003c\/th\u003e\n\u003ctd\u003eRoHS-compliant materials; contact us to confirm certifications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSize selection tip:\u003c\/strong\u003e Always measure the outside diameter of your wire or bundle before ordering. The inside diameter listed is the \u003cem\u003ebefore-shrink\u003c\/em\u003e measurement. After full heat recovery, the tubing will shrink to approximately one-third of that value.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right diameter for my wire?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outside diameter of the wire or bundle you need to cover. Choose a heat shrink size whose inside diameter (before shrinking) is typically 1.2–1.5× the bundle diameter. After applying heat, the tubing shrinks to approximately one-third of its original inside diameter, creating a snug fit. For example, a φ9mm tube suits a bundle up to about 6–7mm in diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does 3:1 shrink ratio mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA 3:1 shrink ratio means the tubing shrinks to roughly one-third of its original inside diameter when heat is applied. For example, a φ9mm tube will shrink down to approximately φ3mm, providing a tighter, more secure fit than standard 2:1 tubing — making it suitable for irregular shapes, stepped connectors, and larger bundles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat temperature is needed to shrink this tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis polyolefin heat shrink tubing generally begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun is recommended for even, controlled shrinkage. Avoid open flames, which can scorch or unevenly shrink the tubing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this heat shrink tubing suitable for outdoor or automotive use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This tubing is made from flame-retardant polyolefin, which generally offers good resistance to UV exposure, moisture, and common automotive fluids. It is typically rated for continuous use in temperatures ranging from approximately -55°C to +125°C (-67°F to +257°F), making it suitable for engine bays, marine wiring, and outdoor electrical installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this tubing have an adhesive lining?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. This is a non-adhesive (without glue) heat shrink tubing. It provides mechanical protection and insulation through a tight physical fit after shrinking. If you need a waterproof seal or adhesive bond, consider a dual-wall adhesive-lined heat shrink tubing instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat wire gauges does each diameter size fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSizing varies by wire insulation thickness, but as a general guide: φ1.5mm suits very fine wires (typically 28–24 AWG); φ3mm suits 22–18 AWG; φ4.5–6mm suits 16–14 AWG; φ9–12mm suits 12–10 AWG or small bundles; φ15–24mm suits medium cable bundles; φ30–50mm suits large harnesses or conduit. Always measure your bundle before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing for marine or waterproof applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis non-adhesive tubing provides moisture resistance through a snug mechanical fit, but it is not fully waterproof on its own. For submersion or high-moisture environments, an adhesive-lined dual-wall heat shrink is generally recommended. For above-deck marine wiring and connector protection, this tubing is typically adequate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow much length do I need for a typical wiring job?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor a single splice or terminal, you generally need 20–50mm (≈1–2\") of tubing. For a full automotive harness repair or workshop project, 5–10 meters is typically sufficient for most tasks. Larger rolls (15–50 m) are cost-effective for workshops, electricians, or anyone doing ongoing wiring work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and length above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"3:1 （Without Glue） \/ φ1.5mm \/ 1 Meter","offer_id":52330288087314,"sku":"QTLJGLBZSJ000480x1","price":1.81,"currency_code":"USD","in_stock":true},{"title":"3:1 （Without Glue） \/ φ1.5mm \/ 2 Meter","offer_id":52330288120082,"sku":"QTLJGLBZSJ000480x2","price":2.11,"currency_code":"USD","in_stock":true},{"title":"3:1 （Without Glue） \/ φ1.5mm \/ 3 Meter","offer_id":52330288152850,"sku":"QTLJGLBZSJ000480x3","price":2.38,"currency_code":"USD","in_stock":true},{"title":"3:1 （Without Glue） \/ φ1.5mm \/ 5 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