{"product_id":"heat-shrink-tubing-3-5mm-2-1-electrical-wire-sleeving","title":"3.5mm Heat Shrink Tubing 2:1 Ratio — Electrical Wire Sleeving, 7 Colors, 1m–100m","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3.5mm Heat Shrink Tubing 2:1 — Reliable Electrical Wire Insulation for Every Project\u003c\/h2\u003e\n\u003cp\u003eWhether you're repairing a frayed wire under the dashboard, tidying up a home automation panel, or color-coding a marine wiring harness, exposed conductors are a safety hazard and a headache. DIYers, electricians, and hobbyists alike need a fast, clean solution that stays put — and that's exactly what this 3.5mm heat shrink tubing delivers.\u003c\/p\u003e\n\u003cp\u003eEach roll is made from flexible polyolefin with a 2:1 shrink ratio, meaning the 3.5mm (≈0.138\") inner diameter recovers to approximately 1.75mm (≈0.069\") when heat is applied. Available in seven colors — Black, White, Red, Green, Yellow, Blue, and Transparent — and in lengths from 1m (≈3.3 ft) up to 100m (≈328 ft), so you can grab exactly what your job requires.\u003c\/p\u003e\n\u003cp\u003eIdeal for automotive wire repair and color-coded wiring harnesses, DIY electronics and PCB lead insulation, and home electrical projects where neat, professional-looking wire management matters. The transparent option is especially popular for applications where you need to see the wire or label underneath.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔌\u003c\/span\u003e \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e This tubing fits wire and terminal outer diameters up to 3.5mm before shrinking. It is compatible with standard polyolefin heat shrink applications and works with any heat gun, soldering station hot-air nozzle, or similar tool. Not recommended for high-voltage (HV) or adhesive-lined applications without confirmation.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 3.5mm Heat Shrink Tubes\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e2:1 Shrink Ratio\u003c\/strong\u003e — Recovers from 3.5mm down to approximately 1.75mm, creating a snug, uniform fit around wires, terminals, and connectors without gaps or loose ends.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e7 Color Options\u003c\/strong\u003e — Black, White, Red, Green, Yellow, Blue, and Transparent let you color-code circuits, match existing wiring conventions, or keep connections visible for inspection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Length Selection\u003c\/strong\u003e — Choose from 1m to 100m rolls so you only buy what you need — whether it's a single repair or a bulk wiring harness job.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003ePolyolefin Construction\u003c\/strong\u003e — Offers solid resistance to moisture, mild chemicals, and abrasion, making it suitable for automotive, marine, and indoor electrical wire sleeving applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eEasy to Cut and Apply\u003c\/strong\u003e — Cuts cleanly with standard scissors or a utility knife; slides over wire easily before shrinking and conforms tightly with a heat gun in seconds.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eElectrical Insulation Performance\u003c\/strong\u003e — Provides a reliable insulating layer over splices, solder joints, and bare conductors, helping prevent short circuits and protecting against accidental contact.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 3.5mm Heat Shrink Tubing\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eHeat Shrink Tubing \/ Electrical Wire Sleeving\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolyolefin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e2:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (Before Shrink)\u003c\/th\u003e\n\u003ctd\u003e3.5mm (≈0.138\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eApproximately 1.75mm (≈0.069\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Colors\u003c\/th\u003e\n\u003ctd\u003eBlack, White, Red, Green, Yellow, Blue, Transparent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1m, 2m, 5m, 10m, 20m, 50m, 100m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically ~90°C (194°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFull Recovery Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically ~120°C (248°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Tool\u003c\/th\u003e\n\u003ctd\u003eHeat gun or hot-air station\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdhesive Lined\u003c\/th\u003e\n\u003ctd\u003eNo (standard wall)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSuitable Wire Gauge\u003c\/th\u003e\n\u003ctd\u003eSee variant options (generally 18–22 AWG range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompliance\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\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\u003eHeads up:\u003c\/strong\u003e If you're unsure whether 3.5mm is the right size for your wire or terminal, measure the outer diameter of the conductor first. The tubing should slide over easily with a little room to spare before heat is applied.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat length of heat shrink tubing do I need for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor single wire repairs or small connectors, 1m or 2m is generally sufficient. For wiring harnesses, automotive projects, or bulk work, 10m–100m rolls offer better value. As a rule of thumb, measure the total run of exposed wire and add 20% for trimming and overlap.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does 2:1 shrink ratio mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA 2:1 ratio means the tubing shrinks to half its original diameter when heat is applied. This 3.5mm tubing will typically shrink down to approximately 1.75mm, making it suitable for wires and terminals in that recovered size range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat wire gauge does 3.5mm heat shrink tubing fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e3.5mm inner diameter tubing generally fits wire gauges in the range of 18–22 AWG before shrinking. Always verify the outer diameter of your wire or connector before selecting a size to ensure a proper fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this heat shrink tubing be used outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis tubing is made from polyolefin, which generally offers good resistance to moisture, UV exposure, and mild chemicals. For harsh outdoor or marine environments, we recommend confirming suitability with our team before use.\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\u003ePolyolefin heat shrink tubing typically activates at around 90°C (194°F) and fully recovers at approximately 120°C (248°F). A heat gun is the recommended tool; avoid open flames as they 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 tubing RoHS compliant and safe for electrical use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis heat shrink tubing is generally manufactured to meet RoHS standards and is suitable for standard electrical insulation applications. For safety-critical or high-voltage installations, please contact us to confirm compliance documentation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a lighter instead of a heat gun?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eWhile a lighter can technically shrink the tubing, it is not recommended. Open flames produce uneven heat and can scorch, bubble, or weaken the tubing. A heat gun or even a hair dryer on high heat will give cleaner, more consistent results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your color and length above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Black \/ φ3.5mm \/ 1m","offer_id":52330223960338,"sku":"FUJYGLBZSJ000050x1","price":2.09,"currency_code":"USD","in_stock":true},{"title":"White \/ φ3.5mm \/ 1m","offer_id":52330223993106,"sku":"FUJYGLBZSJ000051x1","price":2.15,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ3.5mm \/ 1m","offer_id":52330224025874,"sku":"FUJYGLBZSJ000052x1","price":2.15,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ3.5mm \/ 1m","offer_id":52330224058642,"sku":"FUJYGLBZSJ000053x1","price":2.15,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ3.5mm \/ 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