{"product_id":"39mm-dual-wall-heat-shrink-tubing-3-1-adhesive-lined-waterproof","title":"39mm Dual Wall Heat Shrink Tubing 3:1 Ratio Adhesive Lined Waterproof — 1m to 10m","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What length of heat shrink tubing do I need?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the cable run you need to cover and add at least 10–15% extra for overlap and trimming. This tubing is available in 1m (≈3.3 ft), 2m (≈6.6 ft), 5m (≈16.4 ft), and 10m (≈32.8 ft) lengths. For larger wiring projects, the 5m or 10m rolls generally offer better value.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the 3:1 shrink ratio and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A 3:1 shrink ratio means the tubing shrinks to one-third of its original diameter when heat is applied. This allows the 39mm tubing to shrink down to approximately 13mm (≈1\/2\\u201d), making it suitable for covering irregular shapes, connectors, and splices that a standard 2:1 tube cannot grip tightly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this heat shrink tubing waterproof and suitable for outdoor use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The inner adhesive lining melts and flows during shrinking to create a moisture-resistant seal around the cable. This makes it generally suitable for outdoor wiring, marine applications, and underground cable splices where moisture ingress is a concern.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What temperature is needed to shrink this tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Dual wall adhesive-lined heat shrink tubing typically activates at around 70–90°C (158–194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is recommended over an open flame for even, controlled shrinking. Contact us to confirm the exact activation temperature for this product.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What cable or connector sizes fit inside 39mm heat shrink tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The inner diameter before shrinking is φ39mm (≈1.54\\u201d). It is generally compatible with cable bundles, large connectors, and conduit ends up to approximately 35–38mm in diameter. After shrinking, the recovered diameter is typically around 13mm. Always measure your cable bundle before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this tubing for automotive or marine wiring?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The adhesive-lined dual wall construction provides strain relief and moisture sealing that is well-suited for automotive wiring harnesses, boat wiring, and trailer connections. The available color options also help with cable identification in complex wiring systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose between the available colors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Color choice is typically functional rather than aesthetic. Black is the most common for general-purpose use and UV resistance. Transparent allows visual inspection of the underlying cable or splice. Other colors (Red, Blue, Green, Yellow, White) are useful for color-coding circuits in automotive, marine, or industrial wiring.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003ch2\u003e39mm Dual Wall Heat Shrink Tubing — Waterproof Adhesive-Lined Protection for Large Cables \u0026amp; Connectors\u003c\/h2\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhen a standard heat shrink tube just won't seal tightly enough — or when moisture, vibration, and abrasion threaten your wiring — you need a dual wall solution built for the job. This 39mm dual wall heat shrink tubing is designed for electricians, automotive technicians, marine riggers, and serious DIYers who need a reliable, waterproof seal on large-diameter cables, splices, and connectors.\u003c\/p\u003e\n    \u003cp\u003eEach roll contains a single continuous length of dual wall, adhesive-lined heat shrink tubing with an inner diameter of φ39mm (≈1.54\") before shrinking. The 3:1 shrink ratio allows the tubing to recover down to approximately 13mm (≈1\/2\"), conforming tightly around irregular shapes. Available in lengths of 1m (≈3.3 ft), 2m (≈6.6 ft), 5m (≈16.4 ft), and 10m (≈32.8 ft), and in seven colors: Black, White, Red, Green, Yellow, Blue, and Transparent.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include waterproofing automotive wiring harness splices, sealing marine cable penetrations, protecting underground cable joints, and providing strain relief on large industrial connectors. The adhesive inner wall flows into voids during shrinking, making it a go-to choice for waterproof wire splice heat shrink and outdoor cable protection projects.\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 cable bundles and connectors up to approximately 35–38mm in diameter. Recovered inner diameter is typically ~13mm. Verify your cable OD before ordering. Works with standard heat guns; open flame not recommended.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 39mm Dual Wall Adhesive-Lined Heat Shrink Tubes\u003c\/h2\u003e\n\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWaterproof Adhesive Inner Wall\u003c\/strong\u003e — The hot-melt adhesive lining melts and flows during shrinking to fill gaps and create a moisture-resistant seal, ideal for waterproof wire splice heat shrink applications in outdoor 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\u003e3:1 Shrink Ratio\u003c\/strong\u003e — Shrinks from φ39mm down to approximately 13mm, providing a tight, conforming fit over connectors, irregular shapes, and bundled cables that standard 2:1 tubing cannot accommodate.\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 for easy circuit identification and color-coded wiring in automotive, marine, and industrial installations.\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 — Choose from 1m, 2m, 5m, or 10m rolls to match your project scale, from a single cable repair to a full wiring harness protection job.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStrain Relief \u0026amp; Abrasion Resistance\u003c\/strong\u003e — The dual wall construction adds mechanical protection against vibration, chafing, and pull forces at cable terminations — a key advantage for automotive heat shrink tubing and trailer wiring.\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 barrier over splices and bare conductors, helping maintain circuit integrity in high-moisture or high-vibration environments.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — 39mm Dual Wall Heat Shrink Tubing\u003c\/h2\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter (Before Shrink)\u003c\/th\u003e\n\u003ctd\u003eφ39mm (≈1.54\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecovered Inner Diameter (After Shrink)\u003c\/th\u003e\n\u003ctd\u003eTypically ~13mm (≈1\/2\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e3:1\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWall Type\u003c\/th\u003e\n\u003ctd\u003eDual wall — outer polyolefin + inner adhesive lining\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) \/ 5m (≈16.4 ft) \/ 10m (≈32.8 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 120°C (248°F) — contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAdhesive Activation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 70–90°C (158–194°F) — contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication Method\u003c\/th\u003e\n\u003ctd\u003eHeat gun recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWaterproof \/ Moisture Seal\u003c\/th\u003e\n\u003ctd\u003eYes — adhesive-lined inner wall\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSuitable Environments\u003c\/th\u003e\n\u003ctd\u003eAutomotive, marine, outdoor, underground\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eHeat Shrink Tubing\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 shrink temperature and recovered diameter may vary slightly by color and batch. If your application has strict tolerances, please contact us to confirm specifications before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat length of heat shrink tubing do I need?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the cable run you need to cover and add at least 10–15% extra for overlap and trimming. This tubing is available in 1m (≈3.3 ft), 2m (≈6.6 ft), 5m (≈16.4 ft), and 10m (≈32.8 ft) lengths. For larger wiring projects, the 5m or 10m rolls generally offer better value per meter.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the 3:1 shrink ratio and why does it matter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA 3:1 shrink ratio means the tubing shrinks to one-third of its original diameter when heat is applied. This allows the 39mm tubing to shrink down to approximately 13mm (≈1\/2\"), making it suitable for covering irregular shapes, connectors, and splices that a standard 2:1 tube cannot grip tightly.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this heat shrink tubing waterproof and suitable for outdoor use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. The inner adhesive lining melts and flows during shrinking to create a moisture-resistant seal around the cable. This makes it generally suitable for outdoor wiring, marine applications, and underground cable splices where moisture ingress is a concern.\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\u003eDual wall adhesive-lined heat shrink tubing typically activates at around 70–90°C (158–194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is recommended over an open flame for even, controlled shrinking. Contact us to confirm the exact activation temperature for this product.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat cable or connector sizes fit inside 39mm heat shrink tubing?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe inner diameter before shrinking is φ39mm (≈1.54\"). It is generally compatible with cable bundles, large connectors, and conduit ends up to approximately 35–38mm in diameter. After shrinking, the recovered diameter is typically around 13mm. Always measure your cable bundle before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this tubing for automotive or marine wiring?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. The adhesive-lined dual wall construction provides strain relief and moisture sealing that is well-suited for automotive wiring harnesses, boat wiring, and trailer connections. The available color options also help with cable identification in complex wiring systems.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose between the available colors?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eColor choice is typically functional rather than aesthetic. Black is the most common for general-purpose use and UV resistance. Transparent allows visual inspection of the underlying cable or splice. Other colors (Red, Blue, Green, Yellow, White) are useful for color-coding circuits in automotive, marine, or industrial wiring.\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 \/ φ39mm \/ 1 Metre","offer_id":52330366042386,"sku":"GYWXWGLBZSJ000451x1","price":10.19,"currency_code":"USD","in_stock":true},{"title":"White \/ φ39mm \/ 1 Metre","offer_id":52330366075154,"sku":"GYWXWGLBZSJ000452x1","price":10.77,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ39mm \/ 1 Metre","offer_id":52330366107922,"sku":"GYWXWGLBZSJ000453x1","price":10.77,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ39mm \/ 1 Metre","offer_id":52330366140690,"sku":"GYWXWGLBZSJ000454x1","price":10.77,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ39mm \/ 1 Metre","offer_id":52330366173458,"sku":"GYWXWGLBZSJ000455x1","price":10.77,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ39mm \/ 1 Metre","offer_id":52330366206226,"sku":"GYWXWGLBZSJ000456x1","price":10.77,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ39mm \/ 1 Metre","offer_id":52330366238994,"sku":"GYWXWGLBZSJ000457x1","price":10.77,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ39mm \/ 2 Metre","offer_id":52330366271762,"sku":"GYWXWGLBZSJ000451x2","price":19.76,"currency_code":"USD","in_stock":true},{"title":"White \/ φ39mm \/ 2 Metre","offer_id":52330366304530,"sku":"GYWXWGLBZSJ000452x2","price":20.81,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ39mm \/ 2 Metre","offer_id":52330366337298,"sku":"GYWXWGLBZSJ000453x2","price":20.81,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ39mm \/ 2 Metre","offer_id":52330366370066,"sku":"GYWXWGLBZSJ000454x2","price":20.81,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ39mm \/ 2 Metre","offer_id":52330366402834,"sku":"GYWXWGLBZSJ000455x2","price":20.81,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ39mm \/ 2 Metre","offer_id":52330366435602,"sku":"GYWXWGLBZSJ000456x2","price":20.81,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ39mm \/ 2 Metre","offer_id":52330366468370,"sku":"GYWXWGLBZSJ000457x2","price":20.81,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ39mm \/ 5 Metre","offer_id":52330366501138,"sku":"GYWXWGLBZSJ000451x5","price":48.31,"currency_code":"USD","in_stock":true},{"title":"White \/ φ39mm \/ 5 Metre","offer_id":52330366533906,"sku":"GYWXWGLBZSJ000452x5","price":50.9,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ39mm \/ 5 Metre","offer_id":52330366566674,"sku":"GYWXWGLBZSJ000453x5","price":50.9,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ39mm \/ 5 Metre","offer_id":52330366599442,"sku":"GYWXWGLBZSJ000454x5","price":50.9,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ39mm \/ 5 Metre","offer_id":52330366632210,"sku":"GYWXWGLBZSJ000455x5","price":50.9,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ39mm \/ 5 Metre","offer_id":52330366664978,"sku":"GYWXWGLBZSJ000456x5","price":50.9,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ39mm \/ 5 Metre","offer_id":52330366697746,"sku":"GYWXWGLBZSJ000457x5","price":50.9,"currency_code":"USD","in_stock":true},{"title":"Black \/ φ39mm \/ 10 Metre","offer_id":52330366730514,"sku":"GYWXWGLBZSJ000451x10","price":95.89,"currency_code":"USD","in_stock":true},{"title":"White \/ φ39mm \/ 10 Metre","offer_id":52330366763282,"sku":"GYWXWGLBZSJ000452x10","price":101.08,"currency_code":"USD","in_stock":true},{"title":"Red \/ φ39mm \/ 10 Metre","offer_id":52330366796050,"sku":"GYWXWGLBZSJ000453x10","price":101.08,"currency_code":"USD","in_stock":true},{"title":"Green \/ φ39mm \/ 10 Metre","offer_id":52330366828818,"sku":"GYWXWGLBZSJ000454x10","price":101.08,"currency_code":"USD","in_stock":true},{"title":"Yellow \/ φ39mm \/ 10 Metre","offer_id":52330366861586,"sku":"GYWXWGLBZSJ000455x10","price":101.08,"currency_code":"USD","in_stock":true},{"title":"Blue \/ φ39mm \/ 10 Metre","offer_id":52330366894354,"sku":"GYWXWGLBZSJ000456x10","price":101.08,"currency_code":"USD","in_stock":true},{"title":"Transparent \/ φ39mm \/ 10 Metre","offer_id":52330366927122,"sku":"GYWXWGLBZSJ000457x10","price":101.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of12_5f2f9416-230e-44b4-b081-100e898c6d04.jpg?v=1780897717","url":"https:\/\/homediyer.com\/products\/39mm-dual-wall-heat-shrink-tubing-3-1-adhesive-lined-waterproof","provider":"HomeDIYer","version":"1.0","type":"link"}