{"product_id":"20mm-heat-shrink-tubing-2-1-electrical-wire-sleeving-cable-insulation","title":"20mm Heat Shrink Tubing 2:1 Ratio – Electrical Wire Sleeving \u0026 Cable Insulation","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length of heat shrink tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the total cable run you need to cover and add 10–15% extra for overlap and trimming. For example, a 3-meter (≈9.8') run typically works well for most automotive or appliance wiring jobs. Longer lengths like 10m or 20m are ideal for bulk projects or workshop stock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does 2:1 shrink ratio mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A 2:1 ratio means the tubing shrinks to approximately half its original diameter when heat is applied. This 20mm tubing will generally shrink down to around 10mm, providing a snug, secure fit over cables and connectors in that size range.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What wire or cable diameter does 20mm heat shrink fit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This tubing is designed for cables and bundles with an outer diameter typically between 10mm and 18mm (≈3\/8\\\" to 11\/16\\\"). Always measure your cable's outer diameter before ordering to ensure a proper fit.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this heat shrink tubing be used outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard polyolefin heat shrink tubing generally provides good moisture resistance for light outdoor use. However, for prolonged UV exposure or submersion, we recommend a dual-wall adhesive-lined variant. Contact us to confirm suitability for your specific outdoor application.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What temperature is needed to shrink this tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Polyolefin heat shrink tubing typically activates at around 90°C (194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is the recommended tool; avoid open flames as they can scorch or uneven-shrink the material.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this tubing RoHS compliant and safe for electrical use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This heat shrink tubing is generally manufactured from flame-retardant polyolefin material. For specific compliance certifications (RoHS, UL, etc.) relevant to your project, please contact us to confirm before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a lighter or hair dryer instead of a heat gun?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A hair dryer typically does not reach the temperatures needed for reliable shrinking. A heat gun is strongly recommended. In a pinch, a lighter can work on small sections, but it risks scorching — use it carefully and keep the flame moving.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e20mm Heat Shrink Tubing 2:1 — Reliable Electrical Insulation for Wiring \u0026amp; Cable Repairs\u003c\/h2\u003e\n    \u003cp\u003eWhether you're rewiring a vehicle, bundling cables in a control panel, or making clean repairs on appliance wiring, loose or exposed conductors are a safety hazard you can't ignore. DIYers, electricians, and hobbyists alike need a fast, durable way to insulate and protect their work — and that's exactly where 20mm heat shrink tubing delivers.\u003c\/p\u003e\n    \u003cp\u003eEach order includes your chosen length of 20mm (≈13\/16\") diameter, 2:1 shrink ratio polyolefin tubing, available in 1 Meter (≈3.3'), 3 Meter (≈9.8'), 5 Meter (≈16.4'), 10 Meter (≈32.8'), 15 Meter (≈49.2'), and 20 Meter (≈65.6') cuts. Color options include Black, White, Red, Green, Yellow, Blue, and Transparent — making color-coded wiring organization straightforward. Upon applying heat, the tubing shrinks to approximately 10mm, forming a tight, protective sleeve around cables and connectors.\u003c\/p\u003e\n    \u003cp\u003eThis electrical cable insulation sleeving is well-suited for automotive wiring harness repairs, marine cable protection, workshop tool cord management, and DIY electronics projects where a clean, professional finish matters. The transparent option is especially useful when you need to inspect connections without removing the sleeve.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔌\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits cables and wire bundles with an outer diameter typically between 10mm–18mm (≈3\/8\"–11\/16\"). Verify your cable OD before selecting. Shrinks with a standard heat gun at approximately 90–120°C (194–248°F).\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 20mm 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\u003e2:1 Shrink Ratio\u003c\/strong\u003e — Shrinks from 20mm down to approximately 10mm, creating a snug, form-fitting sleeve that locks onto cables and connectors without gaps.\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 allow color-coded wire identification and organization across complex wiring harnesses.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e6 Length Choices\u003c\/strong\u003e — From 1 Meter for quick repairs to 20 Meter rolls for bulk electrical sleeving projects, so you only buy what you need.\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 — Flame-retardant polyolefin material generally provides solid electrical insulation, moisture resistance, and mechanical protection for indoor wiring and light outdoor use.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e👁️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTransparent Option Available\u003c\/strong\u003e — The clear variant lets you visually inspect solder joints and connections without cutting or removing the sleeve — ideal for quality-control checks.\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 \u0026amp; Apply\u003c\/strong\u003e — Cuts cleanly with standard scissors or a utility knife; no special tools required beyond a heat gun for shrinking. Works well for automotive, marine, and DIY electronics cable insulation.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 20mm Heat Shrink Tubing\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eTubing Type\u003c\/th\u003e\n\u003ctd\u003eHeat Shrink Sleeving\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\u003eSupplied Diameter\u003c\/th\u003e\n\u003ctd\u003e20mm (≈13\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecovered Diameter\u003c\/th\u003e\n\u003ctd\u003eApproximately 10mm (≈3\/8\") after full shrink\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFits Cable OD\u003c\/th\u003e\n\u003ctd\u003eTypically 10mm–18mm (≈3\/8\"–11\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolyolefin (flame-retardant)\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 (≈3.3'), 3m (≈9.8'), 5m (≈16.4'), 10m (≈32.8'), 15m (≈49.2'), 20m (≈65.6')\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically ~90°C (194°F); full shrink at ~120°C (248°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWall Thickness (recovered)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Tool\u003c\/th\u003e\n\u003ctd\u003eHeat gun\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Wall thickness and voltage rating vary by production batch. If your application has specific electrical rating requirements, please contact us before ordering to confirm specifications.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length of heat shrink tubing?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the total cable run you need to cover and add 10–15% extra for overlap and trimming. For example, a 3-meter (≈9.8') run typically works well for most automotive or appliance wiring jobs. Longer lengths like 10m or 20m are ideal for bulk projects or workshop stock.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\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 approximately half its original diameter when heat is applied. This 20mm tubing will generally shrink down to around 10mm, providing a snug, secure fit over cables and connectors in that size range.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat wire or cable diameter does 20mm heat shrink fit?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThis tubing is designed for cables and bundles with an outer diameter typically between 10mm and 18mm (≈3\/8\" to 11\/16\"). Always measure your cable's outer diameter before ordering to ensure a proper fit.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\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\u003eStandard polyolefin heat shrink tubing generally provides good moisture resistance for light outdoor use. However, for prolonged UV exposure or submersion, we recommend a dual-wall adhesive-lined variant. Contact us to confirm suitability for your specific outdoor application.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\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 shrinks at approximately 120°C (248°F). A heat gun is the recommended tool; avoid open flames as they can scorch or unevenly shrink the material.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this tubing safe for electrical use and RoHS compliant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThis heat shrink tubing is generally manufactured from flame-retardant polyolefin material. For specific compliance certifications (RoHS, UL, etc.) relevant to your project, please contact us to confirm before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use a lighter or hair dryer instead of a heat gun?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA hair dryer typically does not reach the temperatures needed for reliable shrinking. A heat gun is strongly recommended. In a pinch, a lighter can work on small sections, but it risks scorching — use it carefully and keep the flame moving.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003ecolor and length\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Black \/ 1 Meter","offer_id":52330817388818,"sku":"GLFBFHHGLBZSJ000170x1","price":2.48,"currency_code":"USD","in_stock":true},{"title":"White \/ 1 Meter","offer_id":52330817421586,"sku":"GLFBFHHGLBZSJ000171x1","price":2.62,"currency_code":"USD","in_stock":true},{"title":"Red \/ 1 Meter","offer_id":52330817454354,"sku":"GLFBFHHGLBZSJ000172x1","price":2.62,"currency_code":"USD","in_stock":true},{"title":"Green \/ 1 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