{"product_id":"black-2-1-heat-shrink-tubing-3mm-4mm-5m-600v","title":"Black 2:1 Heat Shrink Tubing 3mm \u0026 4mm — 5 Metre Roll, 600V Rated","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 diameter — 3mm or 4mm?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the outer diameter of the wire or bundle you need to cover. The tubing should slide over the cable easily before shrinking. As a general rule, choose a size whose pre-shrink inner diameter is at least 20–30% larger than your cable's OD. For single wires, 3mm typically suits AWG 20–24; 4mm generally works for AWG 16–20. When in doubt, size up — you can always add a second layer.\"\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 inner diameter when heat is applied. For example, a 4mm pre-shrink tube will shrink down to roughly 2mm (≈5\/64\\u2033) after heating, conforming snugly around the cable.\"\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 set to low or medium is the recommended tool. Avoid open flames, which can scorch or uneven-shrink the sleeve.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this tubing rated for outdoor or wet environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This tubing is made from polyolefin, which is generally moisture-resistant and suitable for light outdoor use. However, it is not adhesive-lined, so it does not form a waterproof seal. For fully weatherproof or submersible applications, consider dual-wall adhesive-lined heat shrink tubing instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the voltage rating and what applications is it safe for?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This tubing is rated at 600V, making it suitable for most residential and light commercial electrical work, automotive wiring, marine connections, and low-voltage electronics. Always verify the voltage requirements of your specific application before use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this for automotive or marine wiring?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Polyolefin heat shrink tubing is commonly used in automotive and marine wiring for insulating splices, protecting terminals, and bundling cables. It is generally resistant to fuels, oils, and mild chemicals. For saltwater or fully submerged marine use, adhesive-lined tubing is typically recommended for a better seal.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How much tubing do I get per order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each order includes a 5 metre (≈16.4 ft) continuous roll in your chosen diameter (3mm or 4mm). Select your preferred size from the variant options above.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eBlack 2:1 Heat Shrink Tubing — Reliable Wire Insulation for DIYers \u0026amp; Electricians\u003c\/h2\u003e\n    \u003cp\u003eLoose wire splices, exposed terminals, and fraying cable ends are a safety hazard — and an eyesore. Whether you're rewiring a car stereo, repairing a lamp cord, or tidying up a control panel, you need heat shrink tubing that goes on easily, shrinks cleanly, and stays put. This black 2:1 heat shrink tubing is a go-to solution for hobbyists, auto technicians, and electricians who want a clean, professional finish without fuss.\u003c\/p\u003e\n    \u003cp\u003eEach order includes a 5 metre (≈16.4 ft) continuous roll of polyolefin heat shrink tubing in your choice of 3mm (≈1\/8\") or 4mm (≈5\/32\") pre-shrink inner diameter. The 2:1 shrink ratio means the tubing reduces to approximately half its original diameter when heat is applied, conforming snugly around wires, connectors, and cable bundles. The tubing is rated at 600V and available in multiple sizes to suit a wide range of wire gauges.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include insulating wire splices and solder joints in automotive wiring harnesses, protecting terminal connections in marine and RV electrical systems, bundling and color-coding cables in electronics projects, and reinforcing strain-relief points on power cords and tool cables — all scenarios where a neat, durable heat shrink sleeve for wire repair makes a real difference.\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 standard wire gauges typically AWG 14–24 depending on diameter selected. Works with heat guns, soldering station hot-air attachments, and similar tools. Not compatible with adhesive-lined applications — single-wall construction only.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Black Heat Shrink Tubing Rolls\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 pre-shrink diameter, conforming tightly around wire splices, terminals, and cable bundles for a secure, gap-free fit.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e600V Voltage Rating\u003c\/strong\u003e — Suitable for residential electrical work, automotive wiring, and low-voltage electronics where a reliable insulating sleeve is required.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e5 Metre Continuous Roll\u003c\/strong\u003e — Each roll provides approximately 16.4 ft of usable tubing, giving you enough material to complete multiple repairs or a full wiring harness run without running short.\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 — Moisture-resistant and generally tolerant of fuels, oils, and mild solvents, making this heat shrink cable sleeving suitable for automotive and light outdoor environments.\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 — Cut to any length with standard scissors or a utility knife. Shrinks evenly with a heat gun in seconds, with no adhesives or special tools required.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSolid Black Finish\u003c\/strong\u003e — Clean, uniform black color blends with most wiring environments and provides a professional appearance on finished installations, from control panels to engine bays.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 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\u003ePolyolefin Heat Shrink Tubing\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\u003eAvailable Sizes (Pre-Shrink ID)\u003c\/th\u003e\n\u003ctd\u003e3mm (≈1\/8\") \u0026amp; 4mm (≈5\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRoll Length\u003c\/th\u003e\n\u003ctd\u003e5 metres (≈16.4 ft) per roll\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd\u003e600V\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\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\u003eAdhesive Lined\u003c\/th\u003e\n\u003ctd\u003eNo — single-wall construction\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSuitable Wire Gauges\u003c\/th\u003e\n\u003ctd\u003eSee variant options (typically AWG 14–24 depending on size)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOutdoor \/ Weatherproof\u003c\/th\u003e\n\u003ctd\u003eMoisture-resistant; not fully waterproof — contact us to confirm for your application\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 × 5m roll in selected size\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\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 diameter — 3mm or 4mm?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the outer diameter of the wire or bundle you need to cover. The tubing should slide over the cable easily before shrinking. As a general rule, choose a size whose pre-shrink inner diameter is at least 20–30% larger than your cable's OD. For single wires, 3mm typically suits AWG 20–24; 4mm generally works for AWG 16–20. When in doubt, size up — you can always add a second layer.\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 inner diameter when heat is applied. For example, a 4mm pre-shrink tube will shrink down to roughly 2mm (≈5\/64\") after heating, conforming snugly around the cable.\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 set to low or medium is the recommended tool. Avoid open flames, which can scorch or uneven-shrink the sleeve.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this tubing rated for outdoor or wet environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThis tubing is made from polyolefin, which is generally moisture-resistant and suitable for light outdoor use. However, it is not adhesive-lined, so it does not form a waterproof seal. For fully weatherproof or submersible applications, consider dual-wall adhesive-lined heat shrink tubing instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the voltage rating and what applications is it safe for?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThis tubing is rated at 600V, making it suitable for most residential and light commercial electrical work, automotive wiring, marine connections, and low-voltage electronics. Always verify the voltage requirements of your specific application before use.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this for automotive or marine wiring?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. Polyolefin heat shrink tubing is commonly used in automotive and marine wiring for insulating splices, protecting terminals, and bundling cables. It is generally resistant to fuels, oils, and mild chemicals. For saltwater or fully submerged marine use, adhesive-lined tubing is typically recommended for a better seal.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow much tubing do I get per order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eEach order includes a 5 metre (≈16.4 ft) continuous roll in your chosen diameter (3mm or 4mm). Select your preferred size from the variant options above.\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 size above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"3mm","offer_id":52330854613266,"sku":"PENGKKMX1055x5","price":4.56,"currency_code":"USD","in_stock":true},{"title":"4mm","offer_id":52330854646034,"sku":"PENGKKMX1056x5","price":5.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture2of3_95c5cbdc-0570-4e33-a6e5-0e3b4b012d8c.jpg?v=1780974609","url":"https:\/\/homediyer.com\/products\/black-2-1-heat-shrink-tubing-3mm-4mm-5m-600v","provider":"HomeDIYer","version":"1.0","type":"link"}