{"product_id":"4-1-adhesive-glue-lined-heat-shrink-tubing-waterproof-black","title":"4:1 Adhesive Glue-Lined Heat Shrink Tubing – Waterproof Black","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e4:1 Glue-Lined Heat Shrink Tubing — Waterproof Protection for Wires, Connectors \u0026amp; Splices\u003c\/h2\u003e\n\u003cp\u003eExposed wire splices, corroded connectors, and poorly sealed cable ends are among the most common causes of electrical failures in automotive, marine, and outdoor installations. Whether you're a professional electrician, a marine technician, or a hands-on DIYer tackling a wiring repair, you need a heat shrink solution that does more than just insulate — it needs to seal.\u003c\/p\u003e\n\u003cp\u003eThis 4:1 adhesive glue-lined heat shrink tubing features a dual-wall construction: an outer polyolefin sleeve with a 4:1 shrink ratio, and an inner thermoplastic adhesive layer that melts during shrinking to form a watertight bond around the substrate. Available in pre-shrink diameters from 4mm (≈5\/32\") to 52mm (≈2\"), sold per 1 metre length, in black.\u003c\/p\u003e\n\u003cp\u003eTypical applications include automotive wiring harness repair, marine cable sealing, outdoor junction box connections, and industrial connector strain relief — anywhere a secure, moisture-resistant sleeve is required.\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 wire, aluminum wire, connector bodies, terminals, and most standard cable insulation materials. Suitable for use in automotive, marine, industrial, and outdoor electrical applications.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 4:1 Glue-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 Wall\u003c\/strong\u003e — The thermoplastic glue lining melts and flows into gaps during shrinking, creating a moisture-resistant seal ideal for marine wiring and outdoor cable protection.\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\u003c\/strong\u003e — Shrinks to one-quarter of its original diameter, conforming tightly to irregular shapes, stepped connectors, and multi-conductor splices 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\u003e10 Sizes Available\u003c\/strong\u003e — Pre-shrink diameters from 4mm (≈5\/32\") to 52mm (≈2\") cover a wide range of wire gauges and connector sizes, from small signal wires to large battery cables.\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 — Sold per 1 metre, the tubing can be cut to any length before or after application, reducing waste and allowing precise coverage on short or long runs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🚗\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAutomotive \u0026amp; Marine Grade Construction\u003c\/strong\u003e — The polyolefin outer wall resists UV exposure, mild fuels, and abrasion, making it a reliable choice for engine bay wiring repairs and underbody harness protection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eElectrical Insulation \u0026amp; Strain Relief\u003c\/strong\u003e — Provides a secondary layer of electrical insulation over splices and terminals while the adhesive bond adds mechanical strain relief, reducing the risk of wire fatigue at connection points.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 4:1 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 (Glue-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\u003ePre-Shrink Diameter Range\u003c\/th\u003e\n\u003ctd\u003e4mm (≈5\/32\") — 52mm (≈2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePost-Shrink Diameter Range\u003c\/th\u003e\n\u003ctd\u003e1mm — 13mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength per Unit\u003c\/th\u003e\n\u003ctd\u003e1 Metre (≈39.4\")\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\u003eOuter Wall Material\u003c\/th\u003e\n\u003ctd\u003ePolyolefin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Wall Material\u003c\/th\u003e\n\u003ctd\u003eThermoplastic Adhesive (Hot-Melt Glue)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eActivation Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 120–150°C (248–302°F)\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\u003eVoltage Rating\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlame Retardancy\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandards Compliance\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication Method\u003c\/th\u003e\n\u003ctd\u003eHeat gun recommended; avoid open flame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right size heat shrink tubing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSelect a pre-shrink diameter that is slightly larger than the widest point of the object you need to cover. For example, if your cable or connector measures 5mm across, choose the 6mm pre-shrink size — after heating it will shrink to approximately 1.5mm. As a general rule, the pre-shrink diameter should be 10–20% larger than the substrate diameter to allow easy insertion before shrinking.\u003c\/p\u003e\n\u003cp\u003eQuick reference: 4mm pre → 1mm post | 8mm pre → 2mm post | 16mm pre → 4mm post | 32mm pre → 8mm post | 52mm pre → 13mm post.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the 4:1 shrink ratio mean, and when do I need it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA 4:1 shrink ratio means the tubing shrinks to one-quarter of its original diameter when heat is applied. This is significantly more than standard 2:1 tubing, making it the right choice for covering stepped connectors, irregular shapes, or applications where you need the tubing to start large (for easy insertion) and finish very tight (for a secure seal). It is commonly used on battery terminals, large automotive connectors, and marine cable glands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this tubing waterproof, and can I use it outdoors or in marine environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The inner adhesive layer melts during shrinking and flows around the substrate, sealing out moisture, water ingress, and mild chemical splash. This dual-wall construction is generally suitable for outdoor wiring, marine cable connections, and underbody automotive applications. For fully submerged or high-pressure water exposure, we recommend confirming the specific IP rating requirements with us before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the adhesive bond, and does it affect the ability to remove the tubing later?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe thermoplastic adhesive creates a firm mechanical bond with the substrate surface, providing good strain relief and pull-out resistance at the connection point. In most cases, once applied and cooled, the tubing is not intended to be removed without cutting. If you anticipate needing to access the connection again, plan your installation accordingly — use a shorter sleeve or position the tubing so it can be cut away cleanly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tool do I need to shrink this tubing, and can I use a lighter or heat gun?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA heat gun is strongly recommended for even, controlled shrinking. Set the heat gun to approximately 120–150°C (248–302°F) and move it steadily along the tubing to avoid hot spots. Open flames (lighters, torches) are generally not recommended — they can scorch the outer wall, create uneven shrinkage, and may not fully activate the inner adhesive layer. For small-diameter tubing in tight spaces, a focused nozzle attachment on the heat gun helps direct airflow precisely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing on automotive wiring and battery terminals?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Glue-lined 4:1 heat shrink tubing is widely used in automotive wiring repairs, battery terminal protection, and harness sealing. The adhesive inner wall bonds to wire insulation and connector bodies, providing both moisture protection and mechanical strain relief. It is typically compatible with standard automotive wire insulation materials. For high-temperature engine bay locations (near exhaust components), verify the operating temperature range is sufficient for your application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow much tubing do I receive per order, and can I order multiple metres?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach unit is sold as 1 metre (≈39.4\") of tubing. You can add multiple units to your cart to get the total length you need. The tubing can be cut to any shorter length before application — simply use scissors or a sharp utility knife for a clean cut.\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":"4mm : 1mm \/ 1 Metre","offer_id":52330048979218,"sku":"PENG-KCSJ1820x1","price":2.3,"currency_code":"USD","in_stock":true},{"title":"6mm : 1.5mm \/ 1 Metre","offer_id":52330049011986,"sku":"PENG-KCSJ1821x1","price":1.97,"currency_code":"USD","in_stock":true},{"title":"8mm : 2mm \/ 1 Metre","offer_id":52330049044754,"sku":"PENG-KCSJ1822x1","price":3.06,"currency_code":"USD","in_stock":true},{"title":"12mm : 3mm \/ 1 Metre","offer_id":52330049077522,"sku":"PENG-KCSJ1823x1","price":3.52,"currency_code":"USD","in_stock":true},{"title":"16mm : 4mm \/ 1 Metre","offer_id":52330049110290,"sku":"PENG-KCSJ1824x1","price":4.34,"currency_code":"USD","in_stock":true},{"title":"20mm : 5mm \/ 1 Metre","offer_id":52330049143058,"sku":"PENG-KCSJ1825x1","price":6.46,"currency_code":"USD","in_stock":true},{"title":"24mm : 6mm \/ 1 Metre","offer_id":52330049175826,"sku":"PENG-KCSJ1826x1","price":6.65,"currency_code":"USD","in_stock":true},{"title":"32mm : 8mm \/ 1 Metre","offer_id":52330049208594,"sku":"PENG-KCSJ1827x1","price":7.19,"currency_code":"USD","in_stock":true},{"title":"40mm : 10mm \/ 1 Metre","offer_id":52330049241362,"sku":"PENG-KCSJ1828x1","price":10.54,"currency_code":"USD","in_stock":true},{"title":"52mm : 13mm \/ 1 Metre","offer_id":52330049274130,"sku":"PENG-KCSJ1829x1","price":13.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of14_5ae210e0-b522-44e0-a258-eb997717a074.jpg?v=1780655650","url":"https:\/\/homediyer.com\/products\/4-1-adhesive-glue-lined-heat-shrink-tubing-waterproof-black","provider":"HomeDIYer","version":"1.0","type":"link"}