How strong is the adhesive lining and what load can it handle?

The hot-melt adhesive inner layer typically provides a watertight seal rated to withstand moisture ingress equivalent to IP67 conditions when properly applied. Tensile strength of the polyolefin outer wall is generally 10–15 MPa, suitable for mechanical protection in most electrical and marine applications.

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

Dual-wall adhesive-lined tubing generally requires a heat gun set to 120–200°C (248–392°F) for full shrinkage and adhesive activation. A standard heat gun is recommended; open flames can cause uneven shrinkage or damage.

Is this tubing RoHS compliant and halogen-free?

Most polyolefin dual-wall heat shrink tubing in this category is RoHS compliant. For halogen-free certification or specific compliance documentation, please contact us to confirm before ordering.

Black 3:1 Heat Shrink Tubing Adhesive Lined – Φ50mm Dual Wall Cable Sleeving

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Black 3:1 Heat Shrink Tubing Adhesive Lined – Φ50mm Dual Wall Cable Sleeving

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Colour: Black

Length: 1M

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$21.56 USD

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Black 3:1 Adhesive Lined Heat Shrink Tubing Φ50mm — Reliable Dual-Wall Cable Protection

When a single-wall sleeve just won't cut it — whether you're sealing a marine wiring harness, protecting automotive cable bundles from road grime, or waterproofing an outdoor electrical splice — you need a dual-wall solution that bonds, seals, and holds. This black 3:1 heat shrink tubing with adhesive lining is built for electricians, marine technicians, automotive enthusiasts, and serious DIYers who can't afford a failed connection.

Each piece is a dual-wall construction: a flexible polyolefin outer wall with a 3:1 shrink ratio, lined with a hot-melt adhesive inner layer that flows and bonds as heat is applied. The expanded inner diameter is Φ50mm (≈1.97"), shrinking down to approximately Φ16–17mm (≈5/8"). Available in lengths from 1M (≈39.4") to 8M (≈314"), sold by the meter so you get exactly what your project requires.

Typical use cases include sealing cable entry points on boat hulls, protecting wire harness splices in engine bays, insulating large-gauge battery cables, and bundling conduit runs in industrial control panels — all situations where a watertight, mechanically robust sleeve is non-negotiable.

🔌 Compatibility: Fits cable bundles or conductors with outer diameters typically from 16mm (5/8") up to 48mm (≈1.89"). Verify your bundle OD before selecting a length. Works with standard heat guns at 120–200°C (248–392°F).

⚠️ Note: Shrink dimensions are typical values for this tubing class. If your application requires certified tolerances (e.g., MIL-spec or UL), please contact us to confirm specifications before ordering.

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

🔒Watertight Adhesive Inner Layer — The hot-melt adhesive flows into cable jacket irregularities when heated, creating a moisture-resistant seal ideal for marine wiring and outdoor electrical splices.
📐3:1 Shrink Ratio — Shrinks from Φ50mm (≈1.97") down to approximately Φ16–17mm (≈5/8"), accommodating a wide range of cable bundle diameters in a single SKU.
🛡️Dual-Wall Polyolefin Construction — The flexible outer wall resists abrasion, UV exposure, and common chemicals, protecting cables in automotive engine bays and outdoor conduit runs.
✂️Cut-to-Length Flexibility — Available in 1M through 8M lengths so you can cut exactly what you need for each splice or run, reducing waste on large wiring projects.
⚡Electrical Insulation — Provides a secondary layer of dielectric insulation over splices and connectors, reducing the risk of short circuits in high-density wiring harnesses.
🌡️Wide Operating Temperature Range — Polyolefin dual-wall tubing generally maintains flexibility and integrity from approximately -55°C to +125°C (-67°F to +257°F), suitable for both cold-climate and under-hood applications.

📐 Technical Specifications — 3:1 Dual Wall Adhesive Heat Shrink Tubing

Product Type	Dual-Wall Adhesive Lined Heat Shrink Tubing
Shrink Ratio	3:1
Color	Black
Expanded Inner Diameter	Φ50mm (≈1.97")
Recovered Inner Diameter	Approximately Φ16–17mm (≈5/8") — see variant options
Available Lengths	1M (≈39.4"), 2M (≈78.7"), 3M (≈118.1"), 4M (≈157.5"), 5M (≈196.9"), 6M (≈236.2"), 8M (≈314.9")
Outer Wall Material	Polyolefin
Inner Layer	Hot-melt adhesive (thermoplastic)
Shrink Temperature	Typically 120–200°C (248–392°F)
Operating Temperature	Generally -55°C to +125°C (-67°F to +257°F)
Voltage Rating	Contact us to confirm
Compliance	Contact us to confirm (RoHS, UL, MIL-spec)
Application Tool	Heat gun (recommended); open flame not recommended

❓ Frequently Asked Questions

How do I choose the right length of heat shrink tubing?

Measure the cable run you need to protect and add at least 10–15% extra for overlap at each end. For example, a 90cm (≈35.4") cable run is best covered with a 1M length. Longer runs or multiple splices may require 2M or more. When in doubt, size up — unused tubing stores easily for future projects.

What does a 3:1 shrink ratio mean for my cable?

A 3:1 shrink ratio means the tubing shrinks to one-third of its original diameter when heat is applied. This Φ50mm tubing will shrink down to approximately Φ16–17mm, making it suitable for a wide range of cable diameters and bundle sizes. This is generally a better choice than 2:1 tubing when you need to cover irregular shapes or large connectors.

How strong is the adhesive seal, and can it handle vibration or pulling force?

The hot-melt adhesive inner layer typically provides a watertight seal rated to withstand moisture ingress equivalent to IP67 conditions when properly applied. The polyolefin outer wall generally has a tensile strength of 10–15 MPa, providing solid mechanical protection against vibration and moderate pulling forces in automotive and marine wiring harness applications.

Can I use this heat shrink tubing outdoors or on a boat?

Yes. The dual-wall construction with adhesive lining creates a moisture-resistant seal, and the polyolefin material is generally UV-stabilized, making it suitable for outdoor, marine, and automotive cable protection. It is commonly used for sealing cable entry points on boat hulls, protecting wiring on docks, and covering outdoor junction box connections.

What cable diameter range fits inside Φ50mm heat shrink tubing?

This Φ50mm (≈1.97") tubing is designed to fit cables or bundles with an outer diameter typically ranging from about 16mm (5/8") up to 48mm (≈1.89"). Always measure your cable bundle's outer diameter before ordering. If your bundle is close to the upper limit, consider using a heat gun with a concentrator nozzle for even shrinkage.

What temperature and tools do I need to shrink this tubing?

Dual-wall adhesive-lined tubing generally requires a heat gun set to 120–200°C (248–392°F) for full shrinkage and adhesive activation. Move the heat gun slowly along the tubing from the center outward to avoid trapping air bubbles. An open flame (torch or lighter) is not recommended as it can cause uneven shrinkage, scorching, or damage to the adhesive layer.

Is this tubing a good choice for large battery cable connections?

In most cases, yes. Φ50mm dual-wall adhesive heat shrink tubing is commonly used to seal and protect large-gauge battery cable lugs, welding cable splices, and inverter connections where both electrical insulation and moisture protection are needed. Verify the voltage rating with us if your application exceeds standard low-voltage wiring.

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

Black 3:1 Heat Shrink Tubing Adhesive Lined – Φ50mm Dual Wall Cable Sleeving

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Black 3:1 Adhesive Lined Heat Shrink Tubing Φ50mm — Reliable Dual-Wall Cable Protection

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

📐 Technical Specifications — 3:1 Dual Wall Adhesive Heat Shrink Tubing

❓ Frequently Asked Questions

Black 3:1 Heat Shrink Tubing Adhesive Lined – Φ50mm Dual Wall Cable Sleeving

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