{"product_id":"28mm-heat-shrink-tubing-2-1-electrical-cable-sleeving-wire-insulation","title":"28mm Heat Shrink Tubing 2:1 Ratio – Electrical Cable Sleeving \u0026 Wire 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 1-meter (≈39.4\\u201d) length suits short wire repairs, while 5–15 meter rolls are better for wiring harnesses or bulk projects. Choose the length that minimizes waste for your specific job.\"\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 shrink ratio means the tubing will shrink to approximately half its original diameter when heat is applied. This 28mm tubing will typically shrink down to around 14mm, conforming snugly around cables, connectors, or splices.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the minimum shrink temperature?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Polyolefin heat shrink tubing generally begins to shrink at around 70–90°C (158–194°F) and achieves full shrinkage at approximately 120°C (248°F). A heat gun is the recommended tool for even, controlled shrinkage.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this heat shrink tubing suitable for outdoor use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard polyolefin heat shrink tubing provides good UV and moisture resistance for general outdoor applications. For prolonged submersion or harsh marine environments, an adhesive-lined variant is generally recommended. Contact us to confirm suitability for your specific environment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What wire or cable diameter fits inside 28mm heat shrink tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 28mm inner diameter (before shrinking) accommodates cable bundles or connectors up to approximately 26mm in diameter. After shrinking, it typically closes down to around 14mm. Always measure your cable bundle's outer diameter before selecting tubing size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this tubing flame-retardant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Polyolefin heat shrink tubing is generally manufactured to meet flame-retardant standards (typically UL 224 or equivalent). It is self-extinguishing in most cases. Contact us to confirm specific certification details for your application.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a lighter instead of a heat gun?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"While a lighter can technically shrink the tubing, it is not recommended — open flames produce uneven heat and can scorch or melt the tubing. A heat gun or embossing tool provides consistent, controlled heat for a clean, professional result.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e28mm Heat Shrink Tubing 2:1 — Reliable Electrical Insulation for Cables, Splices \u0026amp; Connectors\u003c\/h2\u003e\n    \u003cp\u003eExposed wire splices, fraying cable ends, and unprotected connectors are a constant headache for electricians, automotive technicians, and serious DIYers. One failed insulation point can mean a short circuit, a fire hazard, or hours of troubleshooting. This 28mm heat shrink tubing gives you a fast, clean, and durable solution — just slide it on, apply heat, and get a tight, professional-grade seal every time.\u003c\/p\u003e\n    \u003cp\u003eEach order includes your chosen length of 28mm (≈1.1\") inner diameter polyolefin heat shrink tubing with a 2:1 shrink ratio, available in lengths from 1 Meter (≈39.4\") up to 15 Meters (≈49.2 ft). Seven color options — Black, White, Red, Green, Yellow, Blue, and Transparent — make color-coding and circuit identification straightforward. The tubing shrinks down to approximately 14mm (≈0.55\") upon heat application, conforming tightly to cables, connectors, and bundled wire harnesses.\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 dependable heat shrink wire insulation that stays put. The color variety also makes it ideal for color-coded cable labeling in control panels and audio\/video installations.\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 Note:\u003c\/strong\u003e This tubing fits cables and connectors with an outer diameter up to approximately 26mm. Verify your cable bundle diameter before ordering. For adhesive-lined or higher shrink-ratio variants, \u003ca href=\"\/pages\/contact\"\u003econtact us\u003c\/a\u003e.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 28mm 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 — Shrinks from 28mm down to approximately 14mm, conforming snugly around cable bundles, wire splices, and connectors for a tight, gap-free seal.\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 — Made from polyolefin, which is generally self-extinguishing and meets common flame-retardant standards, reducing risk in electrical installations.\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 for Easy Identification\u003c\/strong\u003e — Black, White, Red, Green, Yellow, Blue, and Transparent allow color-coded cable labeling in automotive, marine, and panel wiring applications.\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 — Available in 1m, 3m, 5m, 8m, 10m, and 15m cuts so you can order exactly what your project needs — from a single repair to a full 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\u003eElectrical Insulation \u0026amp; Moisture Resistance\u003c\/strong\u003e — Provides a protective barrier against moisture, dust, and abrasion, making it suitable for both indoor electrical work and general outdoor cable protection.\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; shrinks evenly with a heat gun at typically 120°C (248°F), with no adhesives or special tools required.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 28mm 2:1 Heat Shrink Tubing\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eHeat Shrink Tubing \/ Electrical Sleeving\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter (Before Shrink)\u003c\/th\u003e\n\u003ctd\u003e28mm (≈1.10\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eApproximately 14mm (≈0.55\")\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\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\"), 3m (≈9.8 ft), 5m (≈16.4 ft), 8m (≈26.2 ft), 10m (≈32.8 ft), 15m (≈49.2 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eShrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 120°C (248°F) full shrink; begins at approx. 70–90°C (158–194°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFlame Retardancy\u003c\/th\u003e\n\u003ctd\u003eGenerally flame-retardant (polyolefin); contact us to confirm specific certifications\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWall Thickness (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOperating Temperature Range\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\u003eApplication Tool\u003c\/th\u003e\n\u003ctd\u003eHeat gun recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCertifications\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\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSpec Confirmation:\u003c\/strong\u003e Wall thickness and specific certifications (UL, RoHS, etc.) vary by production batch. Contact us before ordering for safety-critical or compliance-sensitive 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 total cable run you need to cover and add 10–15% extra for overlap and trimming. For example, a 1-meter (≈39.4\") length suits short wire repairs, while 5–15 meter rolls are better for wiring harnesses or bulk projects. Choose the length that minimizes waste for your specific job.\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 shrink ratio means the tubing will shrink to approximately half its original diameter when heat is applied. This 28mm tubing will typically shrink down to around 14mm (≈0.55\"), conforming snugly around cables, connectors, or splices for a secure, insulated finish.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the minimum shrink temperature?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003ePolyolefin heat shrink tubing generally begins to shrink at around 70–90°C (158–194°F) and achieves full shrinkage at approximately 120°C (248°F). A heat gun is the recommended tool for even, controlled shrinkage. Avoid open flames, which can cause uneven shrinking or scorching.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this heat shrink tubing suitable for outdoor use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eStandard polyolefin heat shrink tubing provides good UV and moisture resistance for general outdoor applications such as garden lighting wiring or automotive exterior connections. For prolonged submersion or harsh marine environments, an adhesive-lined variant is generally recommended. Contact us to confirm suitability for your specific environment.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat wire or cable diameter fits inside 28mm heat shrink tubing?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe 28mm inner diameter (before shrinking) accommodates cable bundles or connectors up to approximately 26mm in outer diameter. After shrinking, it typically closes down to around 14mm. Always measure your cable bundle's outer diameter before selecting tubing size to ensure a proper fit.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this tubing flame-retardant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003ePolyolefin heat shrink tubing is generally manufactured to meet flame-retardant standards (typically UL 224 or equivalent) and is self-extinguishing in most cases. Contact us to confirm specific certification details for your application, especially for safety-critical or compliance-sensitive installations.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\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 or melt the tubing. A heat gun or embossing tool provides consistent, controlled heat for a clean, professional result. Most entry-level heat guns suitable for this task are available for under $20.\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":52330944102674,"sku":"GLFBFHHGLBZSJ000191x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"White \/ 1 Meter","offer_id":52330944135442,"sku":"GLFBFHHGLBZSJ000192x1","price":9.25,"currency_code":"USD","in_stock":true},{"title":"Red \/ 1 Meter","offer_id":52330944168210,"sku":"GLFBFHHGLBZSJ000193x1","price":9.25,"currency_code":"USD","in_stock":true},{"title":"Green \/ 1 Meter","offer_id":52330944200978,"sku":"GLFBFHHGLBZSJ000194x1","price":9.25,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ 1 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