{"product_id":"black-heat-shrink-tubing-2-1-ratio-electrical-wire-sleeving","title":"Black Heat Shrink Tubing 2:1 Ratio — Electrical Wire Sleeving, 30mm–100mm Diameter","description":"\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I choose the right diameter of heat shrink tubing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Measure the outer diameter of the wire or bundle you need to cover, then choose a tubing size whose pre-shrink diameter is at least 10-20% larger. With a 2:1 shrink ratio, the tubing shrinks to roughly half its listed diameter. For example, 30mm tubing shrinks to approximately 15mm.\"}},{\"@type\":\"Question\",\"name\":\"What shrink ratio does this tubing use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This tubing uses a 2:1 shrink ratio, meaning it shrinks to approximately half its original diameter when heated.\"}},{\"@type\":\"Question\",\"name\":\"Can this heat shrink tubing be used outdoors or in automotive environments?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. This tubing is generally suitable for automotive wiring harnesses, marine cable management, and outdoor electrical installations. For prolonged submersion or extreme chemical exposure, please contact us to confirm suitability.\"}},{\"@type\":\"Question\",\"name\":\"What temperature is needed to shrink this tubing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Most polyolefin-based 2:1 heat shrink tubing activates at approximately 90 degrees C (194F) and achieves full shrinkage around 120 degrees C (248F). A heat gun is the recommended tool.\"}},{\"@type\":\"Question\",\"name\":\"Is this tubing flame-retardant?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This tubing is generally manufactured from flame-retardant polyolefin material, which self-extinguishes when the heat source is removed. It is typically compliant with UL 224 standards.\"}},{\"@type\":\"Question\",\"name\":\"How do I convert the diameter sizes to inches?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"30mm=1.18in, 35mm=1.38in, 40mm=1.57in, 45mm=1.77in, 50mm=1.97in, 60mm=2.36in, 70mm=2.76in, 80mm=3.15in, 90mm=3.54in, 100mm=3.94in.\"}},{\"@type\":\"Question\",\"name\":\"Can I cut this tubing to a custom length?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The tubing can be cut to any length with standard scissors or a utility knife. The 1M, 2M, and 3M options suit targeted repairs, while the 48M roll is ideal for large-scale projects.\"}}]}\u003c\/script\u003e\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBlack Heat Shrink Tubing 2:1 Ratio — Reliable Insulation for Automotive, Marine \u0026amp; Electrical Wiring\u003c\/h2\u003e\n\u003cp\u003eWhether you're rewiring a vehicle, bundling cables in a control panel, or protecting exposed conductors from moisture and abrasion, finding heat shrink tubing that fits large-diameter wires without splitting or sliding is a constant frustration. Electricians, automotive technicians, and serious DIYers need tubing that goes on easily, shrinks uniformly, and stays put for years.\u003c\/p\u003e\n\u003cp\u003eThis black heat shrink tubing is available in ten diameters — 30mm (approx. 1.18\"), 35mm (approx. 1.38\"), 40mm (approx. 1.57\"), 45mm (approx. 1.77\"), 50mm (approx. 1.97\"), 60mm (approx. 2.36\"), 70mm (approx. 2.76\"), 80mm (approx. 3.15\"), 90mm (approx. 3.54\"), and 100mm (approx. 3.94\") — and in lengths of 1M (approx. 3.3 ft), 2M (approx. 6.6 ft), 3M (approx. 9.8 ft), and a 48M (approx. 157 ft) bulk roll. Made from flame-retardant polyolefin with a 2:1 shrink ratio, it conforms tightly to the underlying wire or bundle when heated to approximately 90-120 degrees C (194-248 degrees F).\u003c\/p\u003e\n\u003cp\u003eTypical applications include automotive wiring harness repair and protection, marine cable management where moisture resistance is critical, industrial control panel wire bundling, and large-gauge home electrical projects requiring heat shrink wire insulation for cables too wide for standard tubing sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003ei\u003c\/span\u003e\u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e Verify your cable's outer diameter before ordering — the pre-shrink diameter should be at least 10-20% larger than the cable OD. The 2:1 ratio means each size shrinks to approximately half its listed diameter.\u003c\/div\u003e\n\u003ch2\u003eKey Features of These Black 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 wire bundles, connectors, and terminals without gaps or wrinkles.\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 self-extinguishing polyolefin material that resists ignition and stops burning when the heat source is removed, meeting general electrical insulation safety requirements.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Diameter Range\u003c\/strong\u003e — Ten sizes from 30mm to 100mm cover everything from thick automotive wiring harnesses to large industrial cable bundles, eliminating the need to source multiple products.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMoisture and Abrasion Resistance\u003c\/strong\u003e — The shrunk tubing forms a protective barrier against moisture ingress, dust, and mechanical abrasion, making it suitable for automotive, marine, and outdoor electrical cable sleeving.\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 Install\u003c\/strong\u003e — Cuts cleanly with scissors or a utility knife; slides over cables before connectors are attached and shrinks evenly with a standard heat gun, no 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\u003eFlexible Length Options\u003c\/strong\u003e — Choose 1M, 2M, or 3M for targeted repairs, or the 48M bulk roll for large-scale wiring projects and professional installers who need heat shrink tubing in quantity.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications — Black Heat Shrink Tubing\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eFlame-retardant polyolefin\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\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e2:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters (pre-shrink)\u003c\/th\u003e\n\u003ctd\u003e30mm (1.18\"), 35mm (1.38\"), 40mm (1.57\"), 45mm (1.77\"), 50mm (1.97\"), 60mm (2.36\"), 70mm (2.76\"), 80mm (3.15\"), 90mm (3.54\"), 100mm (3.94\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1M (3.3 ft), 2M (6.6 ft), 3M (9.8 ft), 48M (157 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 90 degrees C (194F); full shrink at approx. 120 degrees C (248F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWall Thickness (post-shrink)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature Range\u003c\/th\u003e\n\u003ctd\u003eTypically -55 degrees C to +125 degrees C (-67F to +257F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlame Rating\u003c\/th\u003e\n\u003ctd\u003eGenerally UL 224 compliant — contact us to confirm for your application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Tool\u003c\/th\u003e\n\u003ctd\u003eHeat gun (open flame not recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e!\u003c\/span\u003e\u003cstrong\u003eSpec Confirmation:\u003c\/strong\u003e Wall thickness, exact tensile strength, and certification documentation vary by production batch. Contact us before ordering for safety-critical or regulated applications.\u003c\/div\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I choose the right diameter of heat shrink tubing?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the outer diameter of the wire or bundle you need to cover, then choose a tubing size whose pre-shrink diameter is at least 10-20% larger than that measurement. With a 2:1 shrink ratio, the tubing will shrink to roughly half its listed diameter when heat is applied. For example, 30mm (approx. 1.18\") tubing will shrink to approximately 15mm (approx. 0.59\").\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat shrink ratio does this tubing use, and what does that mean?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis tubing uses a 2:1 shrink ratio, meaning it shrinks to approximately half its original diameter when heated. This is the most common ratio for general-purpose electrical insulation and wire bundling. It provides a firm, conforming fit without requiring the extreme heat needed for higher-ratio tubing.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan this heat shrink tubing be used outdoors or in automotive environments?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. This tubing is generally suitable for automotive wiring harnesses, marine cable management, and outdoor electrical installations. It typically resists UV exposure and moisture. For prolonged submersion or exposure to fuels and solvents, please contact us to confirm suitability for your specific environment.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs this tubing flame-retardant and electrically safe?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis tubing is generally manufactured from flame-retardant polyolefin, which self-extinguishes when the heat source is removed. It is typically compliant with UL 224 standards for electrical insulation. Contact us to confirm specific certifications if your project requires documented compliance.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat temperature is needed to shrink this tubing, and what tool should I use?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMost polyolefin 2:1 heat shrink tubing activates at approximately 90 degrees C (194F) and achieves full shrinkage around 120 degrees C (248F). A heat gun is the recommended tool — move it steadily along the tubing to shrink evenly from one end to the other. Avoid open flames, which can cause uneven shrinkage or scorching.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I convert the diameter sizes to inches?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eApproximate inch equivalents for each pre-shrink diameter: 30mm = 1.18\", 35mm = 1.38\", 40mm = 1.57\", 45mm = 1.77\", 50mm = 1.97\", 60mm = 2.36\", 70mm = 2.76\", 80mm = 3.15\", 90mm = 3.54\", 100mm = 3.94\".\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I cut this tubing to a custom length?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The tubing cuts cleanly with standard scissors or a utility knife before or after shrinking. The 1M, 2M, and 3M options let you buy only what you need for a specific repair or project, while the 48M bulk roll is ideal for large-scale wiring jobs or professional installers who regularly need large-diameter heat shrink wire sleeving.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003eSelect your diameter and length above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"30mm \/ 1 M","offer_id":52330437968146,"sku":"SSJWXWDZ00981x1","price":5.11,"currency_code":"USD","in_stock":true},{"title":"35mm \/ 1 M","offer_id":52330438000914,"sku":"SSJWXWDZ00982x1","price":5.86,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 1 M","offer_id":52330438033682,"sku":"SSJWXWDZ00983x1","price":7.09,"currency_code":"USD","in_stock":true},{"title":"45mm \/ 1 M","offer_id":52330438066450,"sku":"SSJWXWDZ00984x1","price":8.06,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 1 M","offer_id":52330438099218,"sku":"SSJWXWDZ00985x1","price":9.3,"currency_code":"USD","in_stock":true},{"title":"60mm \/ 1 M","offer_id":52330438131986,"sku":"SSJWXWDZ00986x1","price":12.04,"currency_code":"USD","in_stock":true},{"title":"70mm \/ 1 M","offer_id":52330438164754,"sku":"SSJWXWDZ00987x1","price":13.63,"currency_code":"USD","in_stock":true},{"title":"80mm \/ 1 M","offer_id":52330438197522,"sku":"SSJWXWDZ00988x1","price":15.84,"currency_code":"USD","in_stock":true},{"title":"90mm \/ 1 M","offer_id":52330438230290,"sku":"SSJWXWDZ00989x1","price":19.46,"currency_code":"USD","in_stock":true},{"title":"100mm \/ 1 M","offer_id":52330438263058,"sku":"SSJWXWDZ00990x1","price":21.04,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 2 M","offer_id":52330438295826,"sku":"SSJWXWDZ00981x2","price":9.08,"currency_code":"USD","in_stock":true},{"title":"35mm \/ 2 M","offer_id":52330438328594,"sku":"SSJWXWDZ00982x2","price":10.55,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 2 M","offer_id":52330438361362,"sku":"SSJWXWDZ00983x2","price":13.02,"currency_code":"USD","in_stock":true},{"title":"45mm \/ 2 M","offer_id":52330438394130,"sku":"SSJWXWDZ00984x2","price":14.96,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 2 M","offer_id":52330438426898,"sku":"SSJWXWDZ00985x2","price":17.46,"currency_code":"USD","in_stock":true},{"title":"60mm \/ 2 M","offer_id":52330438459666,"sku":"SSJWXWDZ00986x2","price":22.92,"currency_code":"USD","in_stock":true},{"title":"70mm \/ 2 M","offer_id":52330438492434,"sku":"SSJWXWDZ00987x2","price":26.1,"currency_code":"USD","in_stock":true},{"title":"80mm \/ 2 M","offer_id":52330438525202,"sku":"SSJWXWDZ00988x2","price":30.55,"currency_code":"USD","in_stock":true},{"title":"90mm \/ 2 M","offer_id":52330438557970,"sku":"SSJWXWDZ00989x2","price":37.75,"currency_code":"USD","in_stock":true},{"title":"100mm \/ 2 M","offer_id":52330438590738,"sku":"SSJWXWDZ00990x2","price":40.94,"currency_code":"USD","in_stock":true},{"title":"30mm \/ 3 M","offer_id":52330438623506,"sku":"SSJWXWDZ00981x3","price":13.04,"currency_code":"USD","in_stock":true},{"title":"35mm \/ 3 M","offer_id":52330438656274,"sku":"SSJWXWDZ00982x3","price":15.26,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 3 M","offer_id":52330438689042,"sku":"SSJWXWDZ00983x3","price":18.94,"currency_code":"USD","in_stock":true},{"title":"45mm \/ 3 M","offer_id":52330438721810,"sku":"SSJWXWDZ00984x3","price":21.87,"currency_code":"USD","in_stock":true},{"title":"50mm \/ 3 M","offer_id":52330438754578,"sku":"SSJWXWDZ00985x3","price":25.61,"currency_code":"USD","in_stock":true},{"title":"60mm \/ 3 M","offer_id":52330438787346,"sku":"SSJWXWDZ00986x3","price":33.8,"currency_code":"USD","in_stock":true},{"title":"70mm \/ 3 M","offer_id":52330438820114,"sku":"SSJWXWDZ00987x3","price":38.57,"currency_code":"USD","in_stock":true},{"title":"80mm \/ 3 M","offer_id":52330438852882,"sku":"SSJWXWDZ00988x3","price":45.23,"currency_code":"USD","in_stock":true},{"title":"90mm \/ 3 M","offer_id":52330438885650,"sku":"SSJWXWDZ00989x3","price":56.06,"currency_code":"USD","in_stock":true},{"title":"100mm \/ 3 M","offer_id":52330438918418,"sku":"SSJWXWDZ00990x3","price":60.82,"currency_code":"USD","in_stock":true},{"title":"40mm \/ 48 M","offer_id":52330438951186,"sku":"SSJWXWDZ00983x48","price":258.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of8_430e4cea-df02-4489-8a44-3a2e072d3521.jpg?v=1780831211","url":"https:\/\/homediyer.com\/products\/black-heat-shrink-tubing-2-1-ratio-electrical-wire-sleeving","provider":"HomeDIYer","version":"1.0","type":"link"}