{"product_id":"20mm-heat-shrink-tubing-2-1-electrical-wire-sleeve","title":"20mm Heat Shrink Tubing 2:1 – Electrical Wire Sleeve for Cable Wrap \u0026 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 section of wire or connector you need to cover and add at least 10–15mm (≈0.5\\u2033) of overlap on each end. For longer cable runs, the 5 Metre or 10 Metre options offer the best value. As a reference: 1 Metre ≈ 39.4\\u2033, 2 Metre ≈ 78.7\\u2033, 5 Metre ≈ 196.9\\u2033, 10 Metre ≈ 393.7\\u2033.\"\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 inner diameter when heat is applied. This 20mm tubing will typically shrink down to around 10mm, creating a snug, secure fit over wires, connectors, or terminals.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What wire or cable sizes does 20mm heat shrink tubing fit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This tubing has a 20mm (≈0.79\\u2033) inner diameter before shrinking, making it generally suitable for wire bundles, connectors, and terminals with an outer diameter up to approximately 20mm. After shrinking, it typically fits down to around 10mm. Check your cable bundle diameter before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can this heat shrink tubing be used outdoors or in automotive applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Heat shrink tubing is commonly used in automotive wiring, marine electrical systems, and outdoor installations. Once shrunk, it provides a moisture-resistant barrier that helps protect connections from dust, moisture, and abrasion. For fully waterproof applications, look for adhesive-lined variants.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What temperature is needed to shrink this tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard 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. A lighter or match can work in a pinch but may cause uneven shrinking or scorching.\"\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 made from polyolefin material, which is widely used in electrical insulation applications. For specific compliance certifications (RoHS, UL, etc.), please contact us to confirm before use in regulated or safety-critical applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why are there different colors available?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Color-coding is a standard practice in electrical work to identify wire functions, voltage levels, or circuit groups at a glance. Having multiple colors (Black, White, Red, Green, Yellow, Blue, Transparent) lets you organize and label wiring harnesses without additional markers or tape.\"\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 — Reliable Wire Insulation for Electrical \u0026amp; Automotive Projects\u003c\/h2\u003e\n    \u003cp\u003eLoose wire ends, exposed connectors, and tangled cable bundles are a frustration for any DIYer, auto mechanic, or marine electrician. Whether you're rewiring a car harness, protecting a splice in a boat, or tidying up a home workshop project, having the right heat shrink tubing on hand makes the difference between a clean, lasting repair and one that fails under heat or moisture.\u003c\/p\u003e\n    \u003cp\u003eEach listing covers a single continuous length of 20mm (≈0.79\") inner diameter heat shrink tubing with a 2:1 shrink ratio, available in lengths of 1 Metre (≈39.4\"), 2 Metre (≈78.7\"), 5 Metre (≈196.9\"), and 10 Metre (≈393.7\"). Made from polyolefin material, it shrinks down to approximately 10mm (≈0.39\") when heat is applied, forming a tight, insulating sleeve. Choose from 7 colors — Black, White, Red, Green, Yellow, Blue, and Transparent — to suit your color-coding needs.\u003c\/p\u003e\n    \u003cp\u003eThis 20mm heat shrink tubing is ideal for bundling automotive wiring harnesses, insulating large-gauge wire splices, protecting marine electrical connections from moisture, and organizing cable management in workshops or control panels. Its flexibility and consistent shrink performance make it a go-to solution for electrical wire wrap and cable sleeve applications.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003eℹ️\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits wire bundles and connectors with an outer diameter up to 20mm (≈0.79\"). After shrinking, inner diameter is typically ~10mm (≈0.39\"). Verify your cable bundle diameter before selecting a length.\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 firm, conforming fit around wires, terminals, and connectors for secure electrical insulation.\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 — Available in Black, White, Red, Green, Yellow, Blue, and Transparent, making color-coded wire identification and cable organization straightforward on any job.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e4 Length Choices\u003c\/strong\u003e — Select 1m, 2m, 5m, or 10m to match your project scale, from a single automotive wire repair to a full wiring harness sleeve job.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMoisture \u0026amp; Abrasion Resistance\u003c\/strong\u003e — Once shrunk, the polyolefin sleeve forms a protective barrier that helps guard connections against dust, moisture ingress, and mechanical abrasion in automotive and marine environments.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eElectrical Insulation\u003c\/strong\u003e — Provides a consistent dielectric layer over splices, terminals, and exposed conductors, reducing the risk of short circuits in low-voltage electrical wire wrap 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 \u0026amp; Apply\u003c\/strong\u003e — Cuts cleanly with standard scissors or a utility knife; shrinks evenly with a heat gun, making it practical for both professional electricians and home DIY cable sleeve projects.\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\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eHeat Shrink Tubing \/ Wire Sleeve\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter (Before Shrink)\u003c\/th\u003e\n\u003ctd\u003e20mm (≈0.79\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter (After Shrink)\u003c\/th\u003e\n\u003ctd\u003e~10mm (≈0.39\") — typically\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolyolefin (generally)\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 (≈39.4\"), 2m (≈78.7\"), 5m (≈196.9\"), 10m (≈393.7\")\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 ~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 (lighter usable with care)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCompliance \/ Certifications\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSuitable Applications\u003c\/th\u003e\n\u003ctd\u003eAutomotive wiring, marine electrical, DIY cable management, wire bundling\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 Specifications such as wall thickness and exact shrink temperature may vary slightly by color. Contact us to confirm specs for safety-critical or regulated applications.\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 section of wire or connector you need to cover and add at least 10–15mm (≈0.5\") of overlap on each end. For longer cable runs, the 5 Metre or 10 Metre options offer the best value. As a reference: 1 Metre ≈ 39.4\", 2 Metre ≈ 78.7\", 5 Metre ≈ 196.9\", 10 Metre ≈ 393.7\".\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 inner diameter when heat is applied. This 20mm tubing will typically shrink down to around 10mm (≈0.39\"), creating a snug, secure fit over wires, connectors, or terminals.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat wire or cable sizes does 20mm heat shrink tubing fit?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThis tubing has a 20mm (≈0.79\") inner diameter before shrinking, making it generally suitable for wire bundles, connectors, and terminals with an outer diameter up to approximately 20mm. After shrinking, it typically fits down to around 10mm. Check your cable bundle diameter before ordering.\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 or in automotive applications?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. Heat shrink tubing is commonly used in automotive wiring, marine electrical systems, and outdoor installations. Once shrunk, it provides a moisture-resistant barrier that helps protect connections from dust, moisture, and abrasion. For fully waterproof applications, look for adhesive-lined variants.\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\u003eStandard 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. A lighter or match can work in a pinch but may cause uneven shrinking or scorching.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\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 made from polyolefin material, which is widely used in electrical insulation applications. For specific compliance certifications (RoHS, UL, etc.), please contact us to confirm before use in regulated or safety-critical applications.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhy are there different colors available?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eColor-coding is a standard practice in electrical work to identify wire functions, voltage levels, or circuit groups at a glance. Having multiple colors (Black, White, Red, Green, Yellow, Blue, Transparent) lets you organize and label wiring harnesses without additional markers or tape.\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 color and length above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Black \/ φ20mm \/ 1 Metre","offer_id":52331112923410,"sku":"GYWXWGLBZSJ000170x1","price":2.16,"currency_code":"USD","in_stock":true},{"title":"White \/ φ20mm \/ 1 Metre","offer_id":52331112956178,"sku":"GYWXWGLBZSJ000171x1","price":2.33,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ20mm \/ 1 Metre","offer_id":52331112988946,"sku":"GYWXWGLBZSJ000172x1","price":2.33,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ20mm \/ 1 Metre","offer_id":52331113021714,"sku":"GYWXWGLBZSJ000173x1","price":2.33,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ20mm \/ 1 Metre","offer_id":52331113054482,"sku":"GYWXWGLBZSJ000174x1","price":2.33,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ20mm \/ 1 Metre","offer_id":52331113087250,"sku":"GYWXWGLBZSJ000175x1","price":2.33,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ20mm \/ 1 Metre","offer_id":52331113120018,"sku":"GYWXWGLBZSJ000176x1","price":2.33,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ20mm \/ 2 Metre","offer_id":52331113152786,"sku":"GYWXWGLBZSJ000170x2","price":3.33,"currency_code":"USD","in_stock":true},{"title":"White \/ φ20mm \/ 2 Metre","offer_id":52331113185554,"sku":"GYWXWGLBZSJ000171x2","price":3.62,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ20mm \/ 2 Metre","offer_id":52331113218322,"sku":"GYWXWGLBZSJ000172x2","price":3.62,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ20mm \/ 2 Metre","offer_id":52331113251090,"sku":"GYWXWGLBZSJ000173x2","price":3.62,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ20mm \/ 2 Metre","offer_id":52331113283858,"sku":"GYWXWGLBZSJ000174x2","price":3.62,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ20mm \/ 2 Metre","offer_id":52331113316626,"sku":"GYWXWGLBZSJ000175x2","price":3.62,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ20mm \/ 2 Metre","offer_id":52331113349394,"sku":"GYWXWGLBZSJ000176x2","price":3.62,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ20mm \/ 5 Metre","offer_id":52331113382162,"sku":"GYWXWGLBZSJ000170x5","price":7.22,"currency_code":"USD","in_stock":true},{"title":"White \/ φ20mm \/ 5 Metre","offer_id":52331113414930,"sku":"GYWXWGLBZSJ000171x5","price":7.94,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ20mm \/ 5 Metre","offer_id":52331113447698,"sku":"GYWXWGLBZSJ000172x5","price":7.94,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ20mm \/ 5 Metre","offer_id":52331113480466,"sku":"GYWXWGLBZSJ000173x5","price":7.94,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ20mm \/ 5 Metre","offer_id":52331113513234,"sku":"GYWXWGLBZSJ000174x5","price":7.94,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ20mm \/ 5 Metre","offer_id":52331113546002,"sku":"GYWXWGLBZSJ000175x5","price":7.94,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ20mm \/ 5 Metre","offer_id":52331113578770,"sku":"GYWXWGLBZSJ000176x5","price":7.94,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ20mm \/ 10 Metre","offer_id":52331113611538,"sku":"GYWXWGLBZSJ000170x10","price":13.71,"currency_code":"USD","in_stock":true},{"title":"White \/ φ20mm \/ 10 Metre","offer_id":52331113644306,"sku":"GYWXWGLBZSJ000171x10","price":15.15,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ20mm \/ 10 Metre","offer_id":52331113677074,"sku":"GYWXWGLBZSJ000172x10","price":15.15,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ20mm \/ 10 Metre","offer_id":52331113709842,"sku":"GYWXWGLBZSJ000173x10","price":15.15,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ20mm \/ 10 Metre","offer_id":52331113742610,"sku":"GYWXWGLBZSJ000174x10","price":15.15,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ20mm \/ 10 Metre","offer_id":52331113775378,"sku":"GYWXWGLBZSJ000175x10","price":15.15,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ20mm \/ 10 Metre","offer_id":52331113808146,"sku":"GYWXWGLBZSJ000176x10","price":15.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture_2_of_12_c608772d-88cf-43ba-8f5c-580a76a33234.jpg?v=1781016311","url":"https:\/\/homediyer.com\/products\/20mm-heat-shrink-tubing-2-1-electrical-wire-sleeve","provider":"HomeDIYer","version":"1.0","type":"link"}