{"product_id":"black-adhesive-heat-shrink-tubing-3-1-ratio","title":"Black Adhesive Heat Shrink Tubing 3:1 Ratio — φ1.6mm to φ65mm, 1M \/ 5M \/ 10M","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eAdhesive Heat Shrink Tubing 3:1 Ratio — Waterproof Wire Protection from φ1.6mm to φ65mm\u003c\/h2\u003e\n\u003cp\u003eLoose wire splices, exposed connectors, and unprotected cable ends are a liability in any build — whether you're rewiring a boat, repairing a trailer harness, or finishing a custom electronics project. This dual-wall adhesive heat shrink tubing gives electricians, automotive technicians, and serious DIYers a reliable way to seal, insulate, and strain-relieve connections in one step.\u003c\/p\u003e\n\u003cp\u003eEach piece is a dual-wall construction: a black polyolefin outer sleeve paired with a hot-melt adhesive inner lining. Available in 16 diameter sizes from φ1.6mm (≈1\/16\") to φ65mm (≈2-9\/16\"), and in lengths of 1M (≈3.3 ft), 5M (≈16.4 ft), and 10M (≈32.8 ft). The 3:1 shrink ratio means the tubing shrinks to approximately one-third of its listed diameter — far tighter than standard 2:1 tubing.\u003c\/p\u003e\n\u003cp\u003eTypical applications include automotive wiring harness repairs, marine cable splicing, trailer connector sealing, data cable strain relief, and panel wiring in industrial enclosures. The adhesive liner flows into gaps and irregular surfaces, making it especially effective for waterproof heat shrink tubing for marine wiring and outdoor electrical connections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔌\u003c\/span\u003e Compatible with copper, aluminum, and multi-conductor cables. Suitable for use with heat guns (recommended) at typically 120–150°C (248–302°F). Works with standard wire gauges from 28 AWG fine wire up to large-diameter conduit and connector boots.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Adhesive 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\u003e3:1 Shrink Ratio\u003c\/strong\u003e — Shrinks to roughly one-third of its expanded diameter, conforming tightly around connectors, splices, and irregular cable profiles where standard 2:1 tubing falls short.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDual-Wall Waterproof Construction\u003c\/strong\u003e — The inner hot-melt adhesive melts and flows during shrinking, creating a moisture-resistant seal ideal for waterproof heat shrink tubing in marine, automotive, and outdoor wiring applications.\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 — 16 sizes from φ1.6mm to φ65mm cover everything from fine instrument wire to large cable bundles and connector boots, eliminating the need for multiple product SKUs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCut-to-Length Flexibility\u003c\/strong\u003e — Available in 1M, 5M, and 10M rolls so you can cut exactly what you need for each connection, reducing waste on small repairs or stocking up for larger wiring harness projects.\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; Corrosion Protection\u003c\/strong\u003e — The adhesive liner bonds to the cable jacket, providing mechanical strain relief at solder joints and crimp connections while blocking moisture and corrosive agents.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🚗\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBroad Application Compatibility\u003c\/strong\u003e — Suited for automotive wiring harness repair, trailer connector sealing, marine cable splicing, and DIY electronics enclosures — anywhere a durable, insulating sleeve is required.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Dual-Wall Adhesive 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\u003eDual-wall polyolefin with hot-melt adhesive inner lining\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\u003e3:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExpanded Inner Diameter (Size Options)\u003c\/th\u003e\n\u003ctd\u003eφ1.6mm (1\/16\") · φ2.4mm (3\/32\") · φ3.2mm (1\/8\") · φ4mm (5\/32\") · φ4.8mm (3\/16\") · φ6.4mm (1\/4\") · φ7.9mm (5\/16\") · φ9.5mm (3\/8\") · φ12.7mm (1\/2\") · φ15.4mm (5\/8\") · φ19.1mm (3\/4\") · φ25.4mm (1\") · φ30mm (≈1-3\/16\") · φ39mm (≈1-9\/16\") · φ50mm (≈2\") · φ65mm (≈2-9\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1M (≈3.3 ft) · 5M (≈16.4 ft) · 10M (≈32.8 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 120–150°C (248–302°F); use a heat gun for best results\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temperature Range\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm for specific grades\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdhesive Activation\u003c\/th\u003e\n\u003ctd\u003eHot-melt inner adhesive activates during heat shrinking\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\u003ctr\u003e\n\u003cth\u003eSuitable Wire Gauges\u003c\/th\u003e\n\u003ctd\u003eGenerally 28 AWG (φ1.6mm) through large multi-conductor bundles (φ65mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\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\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSize selection tip:\u003c\/strong\u003e The diameter listed is the \u003cem\u003eexpanded\u003c\/em\u003e (before-shrink) inner diameter. Choose a size approximately 20–30% larger than your cable's outer diameter. After heating, the tubing will shrink to roughly 1\/3 of the listed size.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right diameter for my cable?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of your cable or connector before shrinking. The tubing diameter listed (e.g., φ6.4mm \/ 1\/4\") is the expanded inner diameter. After heating, it shrinks to approximately 1\/3 of that size. As a general rule, choose a size that is 20–30% larger than your cable's outer diameter for a snug, secure fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\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 roughly one-third of its original diameter when heat is applied. This is significantly more than standard 2:1 tubing, making it suitable for irregular shapes, connectors, and splices where a tighter seal is needed. It also allows the adhesive liner more time to flow and bond before the outer sleeve fully contracts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this heat shrink tubing waterproof and suitable for outdoor or marine use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The inner adhesive lining melts during shrinking and flows around the cable to create a moisture-resistant seal. It is generally suitable for outdoor, marine, and automotive environments where moisture ingress is a concern. For fully submersed or high-pressure wash-down applications, confirm suitability with your specific use case before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat temperature do I need to shrink this tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTypically, a heat gun set to around 120–150°C (248–302°F) is recommended. Move the heat gun slowly and evenly along the tubing to activate the adhesive and shrink the sleeve uniformly. Avoid open flames as they can scorch or unevenly shrink the tubing, compromising the seal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this on automotive wiring and marine cables?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Dual-wall adhesive heat shrink tubing is widely used in automotive wiring harness repairs, marine cable splices, trailer wiring connections, and boat electrical systems. The adhesive liner provides strain relief and corrosion protection at solder joints and crimp connections — exactly where moisture and vibration cause the most damage over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose between 1M, 5M, and 10M lengths?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor a single repair or small project, 1M (≈3.3 ft) is typically sufficient. For wiring harness work, panel builds, or multiple connections of the same diameter, 5M (≈16.4 ft) or 10M (≈32.8 ft) rolls offer better value per meter. Each roll can be cut to any length you need with standard scissors or a utility knife.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat wire gauges does each diameter size generally cover?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAs a general guide: φ1.6mm suits very fine wires (typically 28–24 AWG); φ3.2mm suits 22–18 AWG; φ6.4mm suits 16–14 AWG; φ9.5mm suits 12–10 AWG; larger diameters (φ12.7mm and above) are suited for multi-conductor cables, conduit ends, and large connector boots. Always verify by measuring your cable's actual outer diameter before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and length above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"φ1.6mm \/ 1M","offer_id":52329696035090,"sku":"GLFBNHHGLBZSJ000359x1","price":2.16,"currency_code":"USD","in_stock":true},{"title":"φ2.4mm \/ 1M","offer_id":52329696067858,"sku":"GLFBNHHGLBZSJ000367x1","price":2.3,"currency_code":"USD","in_stock":true},{"title":"φ3.2mm \/ 1M","offer_id":52329696100626,"sku":"GLFBNHHGLBZSJ000374x1","price":2.16,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 1M","offer_id":52329696133394,"sku":"GLFBNHHGLBZSJ000381x1","price":2.24,"currency_code":"USD","in_stock":true},{"title":"φ4.8mm \/ 1M","offer_id":52329696166162,"sku":"GLFBNHHGLBZSJ000388x1","price":2.24,"currency_code":"USD","in_stock":true},{"title":"φ6.4mm \/ 1M","offer_id":52329696198930,"sku":"GLFBNHHGLBZSJ000395x1","price":2.38,"currency_code":"USD","in_stock":true},{"title":"φ7.9mm \/ 1M","offer_id":52329696231698,"sku":"GLFBNHHGLBZSJ000402x1","price":2.57,"currency_code":"USD","in_stock":true},{"title":"φ9.5mm \/ 1M","offer_id":52329696264466,"sku":"GLFBNHHGLBZSJ000409x1","price":2.92,"currency_code":"USD","in_stock":true},{"title":"φ12.7mm \/ 1M","offer_id":52329696297234,"sku":"GLFBNHHGLBZSJ000416x1","price":3.47,"currency_code":"USD","in_stock":true},{"title":"φ15.4mm \/ 1M","offer_id":52329696330002,"sku":"GLFBNHHGLBZSJ000423x1","price":3.88,"currency_code":"USD","in_stock":true},{"title":"φ19.1mm \/ 1M","offer_id":52329696362770,"sku":"GLFBNHHGLBZSJ000430x1","price":4.47,"currency_code":"USD","in_stock":true},{"title":"φ25.4mm \/ 1M","offer_id":52329696395538,"sku":"GLFBNHHGLBZSJ000437x1","price":5.1,"currency_code":"USD","in_stock":true},{"title":"φ30mm \/ 1M","offer_id":52329696428306,"sku":"GLFBNHHGLBZSJ000444x1","price":7.87,"currency_code":"USD","in_stock":true},{"title":"φ39mm \/ 1M","offer_id":52329696461074,"sku":"GLFBNHHGLBZSJ000451x1","price":11.14,"currency_code":"USD","in_stock":true},{"title":"φ50mm \/ 1M","offer_id":52329696493842,"sku":"GLFBNHHGLBZSJ000458x1","price":12.72,"currency_code":"USD","in_stock":true},{"title":"φ65mm \/ 1M","offer_id":52329696526610,"sku":"GLFBNHHGLBZSJ000462x1","price":19.24,"currency_code":"USD","in_stock":true},{"title":"φ1.6mm \/ 5M","offer_id":52329696559378,"sku":"GLFBNHHGLBZSJ000359x5","price":3.52,"currency_code":"USD","in_stock":true},{"title":"φ2.4mm \/ 5M","offer_id":52329696592146,"sku":"GLFBNHHGLBZSJ000367x5","price":3.88,"currency_code":"USD","in_stock":true},{"title":"φ3.2mm \/ 5M","offer_id":52329696624914,"sku":"GLFBNHHGLBZSJ000374x5","price":3.66,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 5M","offer_id":52329696657682,"sku":"GLFBNHHGLBZSJ000381x5","price":4.34,"currency_code":"USD","in_stock":true},{"title":"φ4.8mm \/ 5M","offer_id":52329696690450,"sku":"GLFBNHHGLBZSJ000388x5","price":4.88,"currency_code":"USD","in_stock":true},{"title":"φ6.4mm \/ 5M","offer_id":52329696723218,"sku":"GLFBNHHGLBZSJ000395x5","price":6.11,"currency_code":"USD","in_stock":true},{"title":"φ7.9mm \/ 5M","offer_id":52329696755986,"sku":"GLFBNHHGLBZSJ000402x5","price":7.47,"currency_code":"USD","in_stock":true},{"title":"φ9.5mm \/ 5M","offer_id":52329696788754,"sku":"GLFBNHHGLBZSJ000409x5","price":10.87,"currency_code":"USD","in_stock":true},{"title":"φ12.7mm \/ 5M","offer_id":52329696821522,"sku":"GLFBNHHGLBZSJ000416x5","price":13.67,"currency_code":"USD","in_stock":true},{"title":"φ15.4mm \/ 5M","offer_id":52329696854290,"sku":"GLFBNHHGLBZSJ000423x5","price":15.63,"currency_code":"USD","in_stock":true},{"title":"φ19.1mm \/ 5M","offer_id":52329696887058,"sku":"GLFBNHHGLBZSJ000430x5","price":18.75,"currency_code":"USD","in_stock":true},{"title":"φ25.4mm \/ 5M","offer_id":52329696919826,"sku":"GLFBNHHGLBZSJ000437x5","price":21.69,"currency_code":"USD","in_stock":true},{"title":"φ1.6mm \/ 10M","offer_id":52329696952594,"sku":"GLFBNHHGLBZSJ000359x10","price":5.92,"currency_code":"USD","in_stock":true},{"title":"φ2.4mm \/ 10M","offer_id":52329696985362,"sku":"GLFBNHHGLBZSJ000367x10","price":6.79,"currency_code":"USD","in_stock":true},{"title":"φ3.2mm \/ 10M","offer_id":52329697018130,"sku":"GLFBNHHGLBZSJ000374x10","price":6.38,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ 10M","offer_id":52329697050898,"sku":"GLFBNHHGLBZSJ000381x10","price":7.74,"currency_code":"USD","in_stock":true},{"title":"φ4.8mm \/ 10M","offer_id":52329697083666,"sku":"GLFBNHHGLBZSJ000388x10","price":8.83,"currency_code":"USD","in_stock":true},{"title":"φ6.4mm \/ 10M","offer_id":52329697116434,"sku":"GLFBNHHGLBZSJ000395x10","price":11.27,"currency_code":"USD","in_stock":true},{"title":"φ7.9mm \/ 10M","offer_id":52329697149202,"sku":"GLFBNHHGLBZSJ000402x10","price":13.94,"currency_code":"USD","in_stock":true},{"title":"φ9.5mm \/ 10M","offer_id":52329697181970,"sku":"GLFBNHHGLBZSJ000409x10","price":20.79,"currency_code":"USD","in_stock":true},{"title":"φ12.7mm \/ 10M","offer_id":52329697214738,"sku":"GLFBNHHGLBZSJ000416x10","price":26.37,"currency_code":"USD","in_stock":true},{"title":"φ15.4mm \/ 10M","offer_id":52329697247506,"sku":"GLFBNHHGLBZSJ000423x10","price":30.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture2of8_b210f482-24ec-4c4d-8d3e-e673298176c2.jpg?v=1780559172","url":"https:\/\/homediyer.com\/de\/products\/black-adhesive-heat-shrink-tubing-3-1-ratio","provider":"HomeDIYer","version":"1.0","type":"link"}