{"product_id":"25mm-heat-shrink-tubing-2-1-electrical-cable-sleeving-wire-insulation","title":"25mm 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 3-meter wire harness typically needs at least a 3-meter roll. Longer rolls (10–20m) are generally more economical for workshop or production use.\"\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 25mm tubing will shrink down to roughly 12.5mm (≈1\/2\\\"), making it suitable for cables and connectors in that recovered size range.\"\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 of this type generally begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun set to low-to-medium is typically sufficient. Confirm exact specs on the product label or contact us.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this tubing flame-retardant and safe for outdoor use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Polyolefin heat shrink tubing is generally flame-retardant and offers good resistance to moisture, UV, and mild chemicals, making it suitable for most indoor and sheltered outdoor applications. For prolonged direct UV or submersion exposure, a dual-wall adhesive-lined variant is typically recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What wire or connector sizes fit inside 25mm heat shrink tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 25mm (≈1\\\") inner diameter before shrinking accommodates cable bundles, connectors, or conduit ends up to approximately 24mm in diameter. After shrinking, the recovered inner diameter is typically around 12.5mm. Always measure your cable bundle OD before selecting a size.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I cut the tubing to custom lengths?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The tubing can be cut cleanly with scissors or a utility knife before or after shrinking. Cutting at a slight angle helps prevent fraying and makes it easier to slide over connectors.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which color should I choose for electrical wiring?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Color coding is a common practice in electrical work to identify circuits at a glance. Black is the most widely used for general wiring; red typically indicates positive\/live; green or yellow-green is used for ground in many standards. Transparent is useful when you need to see the underlying wire or label.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e25mm Heat Shrink Tubing 2:1 — Reliable Electrical Insulation for Every Wire Job\u003c\/h2\u003e\n    \u003cp\u003eWhether you're rewiring a vehicle, repairing a frayed power cable, or organizing a workshop wire harness, finding tubing that shrinks cleanly, holds tight, and stays put is half the battle. Electricians, automotive technicians, and serious DIYers all run into the same problem: flimsy sleeving that splits under heat or slides off before you can shrink it. This 25mm heat shrink tubing is built for people who need it to work right the first time.\u003c\/p\u003e\n    \u003cp\u003eEach order includes a continuous roll of polyolefin heat shrink tubing with a 25mm (≈1\") inner diameter before shrinking and a 2:1 shrink ratio — recovering to approximately 12.5mm (≈1\/2\") after heat is applied. Available in seven colors (Black, White, Red, Green, Yellow, Blue, and Transparent) and six lengths from 1 Meter (≈3.3 ft) to 20 Meters (≈65.6 ft), so you can match exactly what your project calls for.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include automotive wiring harness protection, marine cable bundling in sheltered environments, electrical panel wire management, and DIY electronics repair where color-coded wire insulation helps trace circuits quickly. The flame-retardant material also makes it a go-to for workshop tool cord repairs and home electrical projects.\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 cable bundles and connectors up to approximately 24mm OD before shrinking. Recovered inner diameter is typically ~12.5mm (≈1\/2\"). Verify your cable bundle outer diameter before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 25mm 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 to approximately half its original diameter, creating a snug, uniform fit around cables, connectors, and wire splices 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\u003eFlame-Retardant Polyolefin\u003c\/strong\u003e — Made from polyolefin material that is generally flame-retardant and resistant to moisture, mild chemicals, and abrasion — suitable for automotive, marine, and electrical panel applications.\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 Circuit Identification\u003c\/strong\u003e — Black, White, Red, Green, Yellow, Blue, and Transparent let you color-code wire insulation for fast, error-free circuit tracing in complex harnesses.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSix Length Options — 1 to 20 Meters\u003c\/strong\u003e — From a 1m (≈3.3 ft) roll for a quick repair to a 20m (≈65.6 ft) roll for production runs, choose only what you need to avoid waste.\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 Position\u003c\/strong\u003e — Cuts cleanly with scissors or a utility knife before shrinking, so you can pre-cut sections for repetitive tasks or trim to exact length on the fly.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Application Range\u003c\/strong\u003e — Works for electrical cable sleeving, wire bundling, strain relief, connector insulation, and DIY cord repair across automotive, marine, and home wiring projects.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 25mm 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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolyolefin (flame-retardant)\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\u003e25mm (≈1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecovered Inner Diameter (After Shrink)\u003c\/th\u003e\n\u003ctd\u003e~12.5mm (≈1\/2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1m (≈3.3 ft), 3m (≈9.8 ft), 5m (≈16.4 ft), 10m (≈32.8 ft), 15m (≈49.2 ft), 20m (≈65.6 ft)\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\u003eShrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 70–120°C (158–248°F) — see variant label to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOperating Temperature Range\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFlame Retardancy\u003c\/th\u003e\n\u003ctd\u003eGenerally flame-retardant per polyolefin standard — see variant label 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\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eElectrical insulation, cable bundling, wire sleeving, strain relief\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 Exact wall thickness and voltage rating vary by production batch. If your application requires certified specs (e.g., UL, RoHS), please contact us before ordering to confirm current batch documentation.\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 wire harness typically needs at least a 3-meter roll. Longer rolls (10–20m) are generally more economical for workshop or production use.\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 25mm tubing will shrink down to roughly 12.5mm (≈1\/2\"), making it suitable for cables and connectors in that recovered size range.\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 of this type generally begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun set to low-to-medium is typically sufficient. Confirm exact specs on the product label or contact us.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this tubing flame-retardant and safe for outdoor use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003ePolyolefin heat shrink tubing is generally flame-retardant and offers good resistance to moisture, UV, and mild chemicals, making it suitable for most indoor and sheltered outdoor applications. For prolonged direct UV exposure or submersion, a dual-wall adhesive-lined variant is typically recommended.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat wire or connector sizes fit inside 25mm heat shrink tubing?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe 25mm (≈1\") inner diameter before shrinking accommodates cable bundles, connectors, or conduit ends up to approximately 24mm in outer diameter. After shrinking, the recovered inner diameter is typically around 12.5mm. Always measure your cable bundle OD before selecting a size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I cut the tubing to custom lengths?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. The tubing can be cut cleanly with scissors or a utility knife before or after shrinking. Cutting at a slight angle helps prevent fraying and makes it easier to slide over connectors.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich color should I choose for electrical wiring?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eColor coding is a common practice in electrical work to identify circuits at a glance. Black is the most widely used for general wiring; red typically indicates positive\/live; green or yellow-green is used for ground in many standards. Transparent is useful when you need to see the underlying wire or label.\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 \/ 1 Meter","offer_id":52330807099666,"sku":"GLFBFHHGLBZSJ000184x1","price":3.14,"currency_code":"USD","in_stock":true},{"title":"White \/ 1 Meter","offer_id":52330807132434,"sku":"GLFBFHHGLBZSJ000185x1","price":3.3,"currency_code":"USD","in_stock":true},{"title":"Red \/ 1 Meter","offer_id":52330807165202,"sku":"GLFBFHHGLBZSJ000186x1","price":3.3,"currency_code":"USD","in_stock":true},{"title":"Green \/ 1 Meter","offer_id":52330807197970,"sku":"GLFBFHHGLBZSJ000187x1","price":3.3,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ 1 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