3:1 Red Adhesive Heat Shrink Tubing – Glue Lined Waterproof Sleeving

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3:1 Red Adhesive Heat Shrink Tubing – Glue Lined Waterproof Sleeving

Name: 3:1 Red Adhesive Heat Shrink Tubing – Glue Lined Waterproof Sleeving
Brand: HomeDIYer
Price: 2.45 USD
Availability: InStock

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Size（Diameter of a circle): φ1.6mm

Lenght（meter）: 1m

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$2.45 USD

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Verfügbar (500 Stück), versandbereit

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3:1 Red Adhesive Heat Shrink Tubing — Waterproof Glue Lined Sleeving for Wiring Protection

Exposed wire splices, corroded connectors, and unprotected terminals are among the most common causes of electrical failures in automotive, marine, and outdoor installations. Whether you're a professional electrician, a weekend DIYer, or a boat owner chasing down a wiring gremlin, you need a sleeving solution that seals completely — not just covers.

This 3:1 red adhesive heat shrink tubing features a dual-wall construction: an outer polyolefin sleeve that shrinks to one-third its original diameter, and an inner hot-melt adhesive lining that flows into gaps as it heats, forming a watertight mechanical bond. Available in diameters from φ1.6mm (≈1/16") to φ39mm (≈1-1/2"), and in lengths of 1m, 3m, 5m, 10m, and 20m per piece, it covers everything from fine instrument wiring to large cable bundles.

Typical use cases include automotive wiring harness repairs and splice protection, marine electrical connections exposed to salt spray, outdoor landscape lighting and irrigation control wiring, and trailer connector sealing — all applications where a standard 2:1 non-adhesive sleeve simply isn't enough.

ℹ️ Compatibility: Works with standard copper and aluminum conductors, PVC and polyethylene insulated wire, automotive-grade harness connectors, and most crimp terminals. Shrink temperature typically 120°C (248°F) — compatible with standard heat guns.

✅ Key Features of These 3:1 Adhesive Heat Shrink Tubes

💧Waterproof Adhesive Lining — The inner hot-melt glue layer melts and flows during shrinking, sealing around wires and connectors to block moisture, corrosion, and contaminants — ideal for marine and outdoor wiring protection.
🔴High-Visibility Red Color — The red finish makes it easy to identify positive leads, phase markers, or specific circuit groups in complex wiring harnesses, reducing troubleshooting time.
📐3:1 Shrink Ratio — Shrinks to one-third its supplied diameter, providing far greater coverage flexibility than standard 2:1 tubing — suitable for irregular connectors, flanged terminals, and bundled cable runs.
📏Wide Size Range — Fourteen diameter options from φ1.6mm to φ39mm (≈1/16" to ≈1-1/2") cover fine instrument wiring through large power cable bundles in a single product line.
✂️Cut-to-Length Flexibility — Available in 1m, 3m, 5m, 10m, and 20m lengths so you can buy exactly what your project needs — no waste from oversized rolls, no running short on a long harness run.
🔥Heat Gun Compatible — Activates reliably with any standard heat gun; no open flame required. The controlled shrink process ensures even adhesive distribution and a clean, professional finish on automotive wiring repairs and DIY electrical projects.

📐 Technical Specifications — 3:1 Glue Lined Heat Shrink Tubing

Product Type	Dual-wall adhesive-lined heat shrink tubing
Shrink Ratio	3:1
Color	Red
Available Diameters (Supplied)	φ1.6mm (≈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 (≈1-1/2")
Available Lengths	1m · 3m · 5m · 10m · 20m
Outer Wall Material	Polyolefin (cross-linked)
Inner Adhesive Material	Hot-melt polyamide adhesive
Shrink Temperature	Typically 120°C (248°F)
Activation Temperature	Typically 70–90°C (158–194°F)
Operating Temperature Range	See variant options / Contact us to confirm
Voltage Rating	Contact us to confirm
Flame Retardancy	Contact us to confirm
Recommended Tool	Heat gun
Sold As	Individual piece (per meter length selected)

⚠️ Note: Recovered (post-shrink) inner diameter varies by supplied size. If you need exact recovered dimensions for a tight-tolerance application, please contact us to confirm before ordering.

❓ Frequently Asked Questions

How do I choose the right diameter for my wire or connector?

Measure the outer diameter of the wire, bundle, or connector you need to cover. Choose a tubing size whose recovered (post-shrink) inner diameter is slightly smaller than your component — this ensures a tight, waterproof seal. For example, φ4mm tubing recovers to approximately 1.3mm, so it works well on wires up to about 1.2mm OD. When in doubt, size up one step and test on a scrap piece first.

Quick inch reference: φ3.2mm ≈ 1/8" · φ6.4mm ≈ 1/4" · φ9.5mm ≈ 3/8" · φ12.7mm = 1/2" · φ19.1mm = 3/4" · φ25.4mm = 1".

What shrink ratio does this tubing use, and why does it matter?

This tubing has a 3:1 shrink ratio, meaning it shrinks to one-third of its original diameter when heat is applied. A 3:1 ratio provides significantly more coverage flexibility than standard 2:1 tubing, making it suitable for irregular shapes, connectors with flanges, or bundled cables of varying thickness.

Is this tubing waterproof, and can it be used outdoors or in marine environments?

Yes. The inner adhesive lining melts during shrinking and flows into gaps, creating a moisture-resistant seal around the substrate. This makes it generally suitable for outdoor wiring, marine electrical connections, and other environments where moisture ingress is a concern. For fully submerged or high-pressure water exposure, verify suitability with your specific application requirements.

What temperature is needed to shrink this tubing, and what tools can I use?

This 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 for even, controlled shrinking. An open flame (lighter or torch) can be used carefully on larger diameters, but risks scorching the tubing or uneven shrinkage. Avoid direct contact with the heat source.

What is the adhesive lining made of, and is it compatible with my wiring insulation?

The inner lining is generally a hot-melt polyamide adhesive that bonds to most common wire insulation materials including PVC, polyethylene, and nylon jacketing. It is typically compatible with standard automotive, marine, and household wiring. If you are working with specialty insulation materials, contact us to confirm compatibility.

Can I use this tubing for automotive wiring repairs?

Yes, 3:1 glue-lined heat shrink tubing is widely used in automotive wiring harness repairs, splice protection, and connector sealing. The adhesive lining provides vibration resistance and moisture protection that standard non-adhesive tubing cannot match. It is suitable for engine bay wiring, trailer connectors, and underbody harness repairs.

How do I convert the diameter sizes from mm to inches?

Here are the approximate inch equivalents for all available diameters:

φ1.6mm ≈ 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 ≈ 1-1/2"

🛒 Select your diameter and length above, then add to cart — ships from our US warehouse.

3:1 Red Adhesive Heat Shrink Tubing – Glue Lined Waterproof Sleeving

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3:1 Red Adhesive Heat Shrink Tubing — Waterproof Glue Lined Sleeving for Wiring Protection

✅ Key Features of These 3:1 Adhesive Heat Shrink Tubes

📐 Technical Specifications — 3:1 Glue Lined Heat Shrink Tubing

❓ Frequently Asked Questions

3:1 Red Adhesive Heat Shrink Tubing – Glue Lined Waterproof Sleeving

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