{"product_id":"4mm-adhesive-heat-shrink-tubing-3-1-glue-lined-waterproof","title":"3:1 Ratio 4mm Adhesive Heat Shrink Tubing — Glue Lined Waterproof Sleeving","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e4mm Adhesive Heat Shrink Tubing — Waterproof Glue Lined Wire Sleeving with 3:1 Shrink Ratio\u003c\/h2\u003e\n\u003cp\u003eExposed wire connections corrode, loosen, and fail — especially in vehicles, boats, and outdoor installations where moisture and vibration are constant threats. Whether you're a DIY enthusiast repairing a wiring harness, an electrician sealing terminal connections, or a hobbyist building electronics, you need a sleeving solution that actually locks out moisture rather than just covering the wire.\u003c\/p\u003e\n\u003cp\u003eThis 4mm adhesive heat shrink tubing features a dual-wall construction: a flexible polyolefin outer layer combined with a hot-melt adhesive inner lining. The unshrunk inner diameter is 4mm (≈5\/32\"), recovering to approximately 1.3–1.5mm after full shrinkage. Available in 7 colors (Black, White, Red, Green, Yellow, Blue, Clear) and 6 lengths from 1 metre (≈3.3 ft) to 20 metres (≈65.6 ft), so you can buy exactly what your project needs.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include sealing automotive wire splices and connector boots, waterproofing marine electrical connections on boats and trailers, protecting solder joints in outdoor LED and solar installations, and color-coding wiring harnesses in control panels and robotics builds.\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 Fits wire bundles and connectors up to approximately 3.5mm in diameter (unshrunk). Shrinks with a standard heat gun at 120°C (248°F). Suitable for automotive, marine, outdoor, and general electrical wiring applications.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 4mm 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 Layer\u003c\/strong\u003e — The hot-melt glue lining flows into gaps when heated, forming a moisture-resistant seal around wire splices and connector terminals — ideal for marine and outdoor wiring repairs.\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 to one-third of its original 4mm diameter, gripping tightly around small wires and connectors that standard 2:1 tubing cannot seal effectively.\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 — Black, White, Red, Green, Yellow, Blue, and Clear allow color-coded wire identification in automotive harnesses, control panels, and multi-circuit 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 (≈3.3 ft) up to 20m (≈65.6 ft) rolls so you only pay for what your project requires, whether it's a single connector repair or a full wiring harness job.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eLow Activation Temperature\u003c\/strong\u003e — Begins shrinking at approximately 70–90°C (158–194°F), making it compatible with standard heat guns without requiring specialized equipment.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible After Recovery\u003c\/strong\u003e — The polyolefin outer wall remains pliable after shrinking, resisting cracking in high-vibration environments such as engine bays and trailer wiring.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — 4mm 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\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eDual-wall: polyolefin outer layer + hot-melt adhesive inner lining\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\u003eInner Diameter (Unshrunk)\u003c\/th\u003e\n\u003ctd\u003e4mm (≈5\/32\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter (Recovered)\u003c\/th\u003e\n\u003ctd\u003eTypically 1.3–1.5mm (≈1\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShrink Temperature\u003c\/th\u003e\n\u003ctd\u003eTypically 120°C (248°F) full recovery; begins at ~70°C (158°F)\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, Clear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e1m, 3m, 5m, 10m, 15m, 20m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWall Thickness (Unshrunk)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eSuitable Applications\u003c\/th\u003e\n\u003ctd\u003eAutomotive, marine, outdoor electrical, electronics, DIY wiring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication Tool\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-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSizing Note:\u003c\/strong\u003e The 4mm dimension refers to the \u003cem\u003eunshrunk\u003c\/em\u003e inner diameter. Verify your wire or connector diameter before ordering. If your connector is close to 4mm, consider the next size up.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\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 total length of wire or connector you need to cover, then add at least 10–15% extra for overlap and positioning. Available lengths range from 1 metre (≈3.3 ft) up to 20 metres (≈65.6 ft). For single repairs, 1m or 3m is typically sufficient; for wiring harness projects, 10m–20m rolls are generally more economical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does 3:1 shrink ratio mean?\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. For this 4mm (unshrunk) tubing, the recovered inner diameter is typically around 1.3–1.5mm, allowing it to grip tightly around small wires, terminals, and connectors that a standard 2:1 tube would not seal as effectively.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this heat shrink tubing waterproof?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This tubing features a dual-wall construction with an inner adhesive (glue-lined) layer. When heated, the adhesive melts and flows around the substrate, creating a moisture-resistant seal. It is generally suitable for outdoor wiring, marine environments, and automotive applications where moisture ingress is a concern.\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 begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun is recommended for even, controlled shrinkage. Avoid open flames, which can scorch or unevenly shrink the tubing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat wire sizes does 4mm heat shrink tubing fit?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe 4mm unshrunk inner diameter generally accommodates wire bundles or connectors up to approximately 3.5mm in diameter. After shrinking, the recovered diameter is typically around 1.3–1.5mm. For best results, the unshrunk tubing should slide over your wire or connector with a small amount of clearance — a snug but not forced fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this tubing in automotive or marine applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The glue-lined adhesive layer provides a watertight seal that is generally suitable for automotive wiring harnesses, boat wiring, and outdoor electrical connections. The tubing is typically rated to withstand vibration, UV exposure, and temperature fluctuations common in these environments. Confirm specific ratings with your application requirements before use in safety-critical circuits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right color?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eColor selection is typically used for wire identification and organization. Common conventions include black for ground, red for positive, blue for signal, yellow for caution circuits, green for earth\/ground (in some standards), white for neutral, and clear when you want the underlying wire color to remain visible. Choose based on your wiring standard or personal preference.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003ecolor and length\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"φ4mm \/ Black \/ 10 metre","offer_id":52330118775058,"sku":"GLFBLFFGLBZSJ000381x10","price":8.53,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ White \/ 10 metre","offer_id":52330118807826,"sku":"GLFBLFFGLBZSJ000382x10","price":9.18,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ Red \/ 10 metre","offer_id":52330118840594,"sku":"GLFBLFFGLBZSJ000383x10","price":9.18,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ Green \/ 10 metre","offer_id":52330118873362,"sku":"GLFBLFFGLBZSJ000384x10","price":9.18,"currency_code":"USD","in_stock":true},{"title":"φ4mm \/ Yellow \/ 10 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