Clear Glue-Lined 3:1 Heat Shrink Tubing — Waterproof, Φ1.6mm to Φ39mm

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Clear Glue-Lined 3:1 Heat Shrink Tubing — Waterproof, Φ1.6mm to Φ39mm

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Diameter（Unshrunk）: Φ1.6mm

Length: 1M

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$3.01 USD

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In stock (500 units), ready to be shipped

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Clear Glue-Lined 3:1 Heat Shrink Tubing — Reliable Waterproof Wire Protection

Exposed wire connections are a liability — whether you're wiring a boat, building a trailer harness, or repairing automotive electronics, a loose or unprotected splice can fail at the worst moment. This clear glue-lined 3:1 heat shrink tubing is designed for DIYers, electricians, and hobbyists who need a dependable, moisture-resistant seal on every connection.

Each order is sold by the meter in your chosen diameter and length. The tubing features a dual-wall construction: an outer polyolefin sleeve paired with an inner hot-melt adhesive lining. Available in diameters from Φ1.6mm (≈1/16") to Φ39mm (≈1-1/2"), with length options of 1M (≈3.3 ft), 5M (≈16.4 ft), 10M (≈32.8 ft), and 25M (≈82 ft). The clear finish lets you visually confirm the connection underneath after shrinking.

Typical applications include marine and boat wiring, automotive wire splices and connector sealing, outdoor landscape lighting connections, and workshop cable management — anywhere a waterproof heat shrink sleeve with a strong adhesive bond is needed.

ℹ️ Compatibility Note: Diameter listed is the unshrunk inner diameter. With a 3:1 shrink ratio, the tubing shrinks to approximately one-third of the listed size. Choose a diameter 20–30% larger than your wire or connector for a secure fit.

✅ Key Features of These Clear Glue-Lined Heat Shrink Tubes

💧Dual-Wall Waterproof Seal — Inner hot-melt adhesive flows when heated, creating a moisture-resistant bond ideal for marine wiring and outdoor electrical connections.
🔥3:1 Shrink Ratio — Shrinks to one-third of its original diameter, providing superior coverage over connectors, stepped transitions, and irregular shapes compared to standard 2:1 tubing.
🔍Clear Transparent Finish — Allows visual inspection of the wire or connector underneath after installation, useful for quality checks on automotive and marine harnesses.
📏Wide Size Range — Φ1.6mm to Φ39mm covers fine gauge wires through large cable bundles, reducing the need to stock multiple product lines for different waterproof heat shrink sleeve applications.
✂️Cut-to-Length Flexibility — Sold in 1M, 5M, 10M, and 25M rolls so you can buy exactly what your project requires, from a single repair to a full wiring harness build.
⚡Polyolefin Construction — Flame-retardant polyolefin material is generally resistant to oils, solvents, and UV exposure, making it suitable for under-hood automotive and outdoor DIY use.

📐 Technical Specifications — Clear Glue-Lined Heat Shrink Tubing

Product Type	Dual-Wall Glue-Lined Heat Shrink Tubing
Material	Polyolefin (outer) + Hot-Melt Adhesive (inner lining)
Shrink Ratio	3:1
Color / Finish	Clear (transparent)
Diameter Range (Unshrunk)	Φ1.6mm (≈1/16") — Φ39mm (≈1-1/2")
Available Diameters	Φ1.6mm, Φ2.4mm, Φ3.2mm, Φ4mm, Φ4.8mm, Φ6.4mm, Φ7.9mm, Φ9.5mm, Φ12.7mm, Φ15.4mm, Φ19.1mm, Φ25.4mm, Φ30mm, Φ39mm
Available Lengths	1M (≈3.3 ft), 5M (≈16.4 ft), 10M (≈32.8 ft), 25M (≈82 ft)
Activation Temperature	Typically 70–90°C (158–194°F)
Full Shrink Temperature	Typically ~120°C (248°F)
Recommended Tool	Heat gun (open flame not recommended)
Waterproof / Moisture Seal	Yes — adhesive lining provides moisture-resistant seal
Flame Retardant	Yes (polyolefin material)
Typical Applications	Marine wiring, automotive harnesses, outdoor electrical, cable repair
Wall Thickness (unshrunk)	See variant options
Operating Temperature Range	Contact us to confirm

⚠️ Sizing Tip: The diameter shown is the unshrunk inner diameter. Always measure your wire or connector and select a size approximately 20–30% larger for a proper fit after shrinking.

❓ Frequently Asked Questions

How do I choose the right diameter for my application?

Select a diameter (unshrunk) that is generally 20–30% larger than the object you need to cover. For example, to cover a 3mm wire bundle, choose the Φ4mm size. With a 3:1 shrink ratio, the tubing will shrink down to approximately one-third of its original diameter. When in doubt, size up — you can always apply more heat gradually.

Quick reference: Φ1.6mm (≈1/16") suits very fine wires; Φ6.4mm (≈1/4") suits typical automotive wire bundles; Φ25.4mm (≈1") suits larger cable assemblies.

What is the shrink ratio and what does 3:1 mean?

A 3:1 shrink ratio means the tubing will shrink to approximately one-third of its original (unshrunk) inner diameter when heat is applied. This is significantly more coverage than standard 2:1 tubing, making it suitable for irregular shapes, connectors, and stepped transitions where a tighter, more conforming seal is needed.

Is this heat shrink tubing waterproof?

Yes. This is a dual-wall construction: the outer polyolefin sleeve shrinks around the substrate while the inner adhesive lining melts and flows to create a moisture-resistant seal. It is generally suitable for outdoor, marine, and automotive wiring exposed to moisture, humidity, and mild chemical splash. For fully submerged or high-pressure water exposure, please contact us to confirm suitability.

Can I use this tubing outdoors or in marine environments?

Yes, the glue-lined construction provides a seal that is typically resistant to moisture ingress, making it suitable for outdoor electrical connections, boat wiring, and trailer harnesses. The polyolefin material also offers general resistance to UV exposure and mild chemicals. For fully submerged applications, contact us to confirm suitability for your specific use case.

What temperature is needed to shrink this tubing?

Polyolefin heat shrink tubing of this type typically activates at around 70–90°C (158–194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is recommended for even, controlled shrinkage. Avoid open flames, which can cause uneven shrinkage, scorching, or damage to the adhesive lining.

Is this tubing compatible with standard wire gauges and connector types?

Yes. The range of diameters (Φ1.6mm to Φ39mm) covers most standard wire gauges from very fine signal wires up to large cable bundles and connectors. The clear finish allows visual inspection of the connection underneath after shrinking. For specific connector compatibility, refer to the variant size chart or contact us to confirm.

How much length do I need for my project?

For small repairs or a single connection, 1M (≈3.3 ft) is generally sufficient. For wiring harness projects or automotive builds with multiple connections, 5M or 10M rolls offer better value per meter. The 25M (≈82 ft) roll is ideal for workshops, marine electricians, or anyone doing repeated installations across multiple projects.

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

Clear Glue-Lined 3:1 Heat Shrink Tubing — Waterproof, Φ1.6mm to Φ39mm

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Clear Glue-Lined 3:1 Heat Shrink Tubing — Reliable Waterproof Wire Protection

✅ Key Features of These Clear Glue-Lined Heat Shrink Tubes

📐 Technical Specifications — Clear Glue-Lined Heat Shrink Tubing

❓ Frequently Asked Questions

Clear Glue-Lined 3:1 Heat Shrink Tubing — Waterproof, Φ1.6mm to Φ39mm

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