{"product_id":"4-1-clear-heat-shrink-tubing-adhesive-glue-lined-4mm-20mm","title":"4:1 Clear Heat Shrink Tubing with Adhesive Glue Liner — Φ4mm to Φ20mm","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e4:1 Clear Heat Shrink Tubing with Adhesive Glue Liner — Reliable Waterproof Wire Protection\u003c\/h2\u003e\n\u003cp\u003eWhen a standard heat shrink sleeve just isn't enough — when you need a seal that holds against moisture, vibration, and mechanical stress — electricians, automotive technicians, and serious DIYers reach for dual-wall adhesive-lined tubing. Loose connections, corroded splices, and water-damaged wiring are frustrating and costly to fix. This 4:1 clear heat shrink tubing with glue liner was built to prevent exactly those failures before they happen.\u003c\/p\u003e\n\u003cp\u003eEach piece is a dual-wall construction: an outer polyolefin sleeve with a 4:1 shrink ratio, and an inner hot-melt adhesive layer that flows and bonds to the substrate when heat is applied. Available in diameters from Φ4mm to Φ20mm (unshrunk), with lengths of 20cm (≈7.9\"), 60cm (≈23.6\"), and 1m (≈39.4\"). The transparent clear finish lets you visually inspect the connection underneath after installation.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include sealing automotive wiring harness splices, protecting marine and boat electrical connectors from saltwater corrosion, insulating battery terminal connections, and strain-relieving cable ends on outdoor power tools and garden equipment — all scenarios where a standard 2:1 sleeve would leave gaps or fail to seal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔌\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Works with standard copper and aluminum wire, PVC\/PE\/nylon-jacketed cables, crimp connectors, ring terminals, and butt splices. Suitable for 12V automotive, marine, RV, and low-voltage DC applications. Confirm suitability for high-voltage or high-temperature environments before use.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 4:1 Adhesive-Lined 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\u003eWaterproof Adhesive Inner Layer\u003c\/strong\u003e — The hot-melt glue liner melts and flows during shrinking, creating a moisture-resistant seal that protects wire splices and connectors from water ingress, humidity, and corrosion.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔍\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTransparent Clear Finish\u003c\/strong\u003e — The clear outer wall lets you visually confirm proper installation and inspect the connection underneath without removing the sleeve — useful for quality checks on automotive and marine wiring.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e4:1 Shrink Ratio for Tight Conforming Fit\u003c\/strong\u003e — Shrinks to approximately one-quarter of its original diameter, conforming tightly around irregular shapes, stepped connectors, and tapered cable ends where standard 2:1 tubing leaves gaps.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSix Diameter Options (Φ4mm–Φ20mm)\u003c\/strong\u003e — Covers a wide range of wire gauges and connector sizes in a single product line, from small signal wires up to larger power cables and battery terminals.\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 20cm (≈7.9\"), 60cm (≈23.6\"), and 1m (≈39.4\") pieces, so you can cut exactly what you need for each splice or connector without waste.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eStrain Relief and Mechanical Protection\u003c\/strong\u003e — The rigid-when-cooled outer sleeve adds mechanical protection against abrasion, bending stress, and pull-out forces at cable terminations — extending the service life of connections in high-vibration environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 4:1 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\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eDual-Wall Adhesive-Lined Heat Shrink Tubing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Ratio\u003c\/th\u003e\n\u003ctd\u003e4:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Wall Material\u003c\/th\u003e\n\u003ctd\u003ePolyolefin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Layer\u003c\/th\u003e\n\u003ctd\u003eHot-melt adhesive (polyamide-based)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor \/ Finish\u003c\/th\u003e\n\u003ctd\u003eTransparent Clear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Options (Unshrunk)\u003c\/th\u003e\n\u003ctd\u003eΦ4mm, Φ6mm, Φ8mm, Φ12mm, Φ16mm, Φ20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Options\u003c\/th\u003e\n\u003ctd\u003e20cm (≈7.9\"), 60cm (≈23.6\"), 1m (≈39.4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 70–90°C (158–194°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFull Shrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically ~120°C (248°F)\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\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us 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\u003eApplicable Standards\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\u003eNote:\u003c\/strong\u003e Voltage rating and operating temperature range vary by batch. If your application requires certified specs (UL, RoHS, MIL-SPEC), please contact us before ordering to confirm.\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 wire or cable?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of your wire or connector before shrinking. Because this tubing has a 4:1 shrink ratio, you should select a size where the unshrunk diameter is typically 2–4× the diameter of the object you're covering. For example, Φ8mm (unshrunk) will shrink down to approximately 2mm. When in doubt, size up — you can always shrink tighter, but you can't expand tubing that's too small.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does '4:1 shrink ratio' mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA 4:1 shrink ratio means the tubing will shrink to approximately one-quarter 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 stepped transitions where a tighter, more conforming seal is needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this tubing waterproof and suitable for outdoor use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The inner adhesive glue layer melts and flows during shrinking to create a moisture-resistant seal around the substrate. This makes it generally suitable for outdoor wiring, marine environments, and applications exposed to moisture or humidity. For fully submersed or high-pressure water exposure, confirm suitability with your specific application requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\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\u003eThis tubing typically activates at around 70–90°C (158–194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is the recommended tool. Avoid open flames, which can cause uneven shrinking or scorching of the clear material.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the glue liner made of, and will it damage my wires?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe inner liner is generally a hot-melt adhesive (typically polyamide-based) that bonds to the substrate when heated. It is designed to be compatible with standard wire insulation materials including PVC, polyethylene, and nylon jacketing. It will not damage properly insulated wires under normal use conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this on automotive wiring or marine applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, dual-wall adhesive-lined heat shrink tubing is widely used in automotive wiring harnesses, trailer connectors, boat wiring, and RV electrical systems. The glue seal helps protect against vibration, moisture ingress, and corrosion at connection points — common failure areas in vehicles and marine environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I cut the tubing to the length I need?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSimply cut with sharp scissors or a utility knife before applying heat. Cut slightly longer than needed — typically add 5–10mm (about 1\/4\") on each end — to account for any longitudinal shrinkage and to ensure full coverage of the joint or splice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select 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":"Φ4mm \/ 20CM","offer_id":52329814917394,"sku":"XU0143-0","price":2.18,"currency_code":"USD","in_stock":true},{"title":"Φ4mm \/ 60CM","offer_id":52329814950162,"sku":"XU0143-1","price":5.25,"currency_code":"USD","in_stock":true},{"title":"Φ4mm \/ 1M","offer_id":52329814982930,"sku":"XU0143-2","price":6.57,"currency_code":"USD","in_stock":true},{"title":"Φ6mm \/ 20CM","offer_id":52329815015698,"sku":"XU0143-3","price":2.18,"currency_code":"USD","in_stock":true},{"title":"Φ6mm \/ 60CM","offer_id":52329815048466,"sku":"XU0143-4","price":5.25,"currency_code":"USD","in_stock":true},{"title":"Φ6mm \/ 1M","offer_id":52329815081234,"sku":"XU0143-5","price":7.22,"currency_code":"USD","in_stock":true},{"title":"Φ8mm \/ 20CM","offer_id":52329815114002,"sku":"XU0143-6","price":2.18,"currency_code":"USD","in_stock":true},{"title":"Φ8mm \/ 60CM","offer_id":52329815146770,"sku":"XU0143-7","price":5.25,"currency_code":"USD","in_stock":true},{"title":"Φ8mm \/ 1M","offer_id":52329815179538,"sku":"XU0143-8","price":7.45,"currency_code":"USD","in_stock":true},{"title":"Φ12mm \/ 20CM","offer_id":52329815212306,"sku":"XU0143-9","price":2.18,"currency_code":"USD","in_stock":true},{"title":"Φ12mm \/ 60CM","offer_id":52329815245074,"sku":"XU0143-10","price":6.57,"currency_code":"USD","in_stock":true},{"title":"Φ12mm \/ 1M","offer_id":52329815277842,"sku":"XU0143-11","price":8.77,"currency_code":"USD","in_stock":true},{"title":"Φ16mm \/ 20CM","offer_id":52329815310610,"sku":"XU0143-12","price":4.37,"currency_code":"USD","in_stock":true},{"title":"Φ16mm \/ 60CM","offer_id":52329815343378,"sku":"XU0143-13","price":7.89,"currency_code":"USD","in_stock":true},{"title":"Φ16mm \/ 1M","offer_id":52329815376146,"sku":"XU0143-14","price":10.87,"currency_code":"USD","in_stock":true},{"title":"Φ20mm \/ 20CM","offer_id":52329815408914,"sku":"XU0143-15","price":4.37,"currency_code":"USD","in_stock":true},{"title":"Φ20mm \/ 60CM","offer_id":52329815441682,"sku":"XU0143-16","price":8.77,"currency_code":"USD","in_stock":true},{"title":"Φ20mm \/ 1M","offer_id":52329815474450,"sku":"XU0143-17","price":10.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of2_97d20907-9739-427f-afc1-a79bcb8d42bf.jpg?v=1780577381","url":"https:\/\/homediyer.com\/products\/4-1-clear-heat-shrink-tubing-adhesive-glue-lined-4mm-20mm","provider":"HomeDIYer","version":"1.0","type":"link"}