Heavy-Duty Dual Wall Heat Shrink Tubing | 12mm Diameter, 3:1 Ratio (Black - 1m Length)
Protect, insulate, and fully waterproof your heavy-gauge electrical joins with this premium 12mm Black Dual Wall Heat Shrink Tubing. Supplied in a convenient 1-metre length, this commercial-grade polyolefin tubing features an advanced 3:1 shrink ratio, meaning it collapses down to a tight 4mm diameter to provide a seamless, form-fitting protective barrier over large cable lugs, splices, and earth terminals.
Engineered with an internal hot-melt adhesive lining, the outer wall shrinks tightly under heat while the inner layer melts and flows. This encapsulates the entire joint, creating a permanent, watertight, and dustproof environment seal that completely blocks out moisture, salt, and atmospheric corrosion.
Key Features
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Advanced 3:1 Shrink Ratio: Highly versatile sizing that easily slides over bulky terminals or lugs and shrinks down small enough to grip the bare cable tightly.
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Dual Wall Co-Extrusion: Built with a flame-retardant outer layer for ultimate physical toughness and a hot-melt adhesive inner liner for a flawless, watertight seal.
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Superior Strain Relief: Vastly improves the mechanical strength of the cable transition, absorbing vibrations and physical pulling forces to prevent structural failures.
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Flame and Chemical Resistant: Manufactured to withstand extreme engine bay environments, resisting fuels, hydraulic oils, acids, and environmental solvents.
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Industrial Compliance: Crafted to comply with RoHS, REACH, and ISO manufacturing standards, making it the choice for professional trade installations.
Technical Specifications
| Feature |
Specification |
| Product Type |
Dual Wall Adhesive-Lined Heat Shrink |
| Color |
Black (Ideal for negative/ground DC power lines) |
| Supplied Diameter |
12mm |
| Fully Shrunk Diameter |
4mm |
| Shrink Ratio |
3:1 (Longitudinal Change: ≤ ±8%) |
| Supplied Length |
1 Metre |
| Material Profile |
Premium Polyolefin + Hot-Melt Adhesive Layer |
| Operating Temperature |
-45°C to +125°C |
| Shrink Temperature |
Starts at 125°C (Fully recovered up to 200°C) |
| Voltage Rating |
600V Continuous |
Applications
The ultimate solution for professional insulation and weatherproofing on medium-to-large wiring setups, including:
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Sealing 25mm² and 35mm² battery cable lugs and eyelet terminations
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Insulation for 12V / 24V / 48V negative DC ground systems and common chassis earth points
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Marine electrical overhauls, bilge pump links, and boat trailer harness protection
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4WD accessory circuits, under-bonnet relay wiring, and winch power connections
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Commercial switchgear, solar arrays, and outdoor industrial junction points
We appreciate your business and are committed to providing exceptional service and timely delivery. Please review the shipping information below before placing your order.
Is It In Stock?
Over 98% of the products listed on our website are in stock.
If a part is not currently in stock, we will notify you as soon as we process your order. We process all orders on the same business day they are received.
If you would like to confirm availability before placing your order, please contact us.
Packaging
Rest assured that all items will be securely packaged to minimise the risk of damage during transit. Fragile or high-value parts may be packaged with additional protective materials such as bubble wrap, foam padding, or reinforced cartons.
Where Do You Ship From?
All parts are stocked and shipped from our location at The Boat Works Marina on the Gold Coast, Australia.
Shipping Rates
Shipping rates vary based on the size, weight, and destination of the package. Estimated shipping costs are displayed during checkout before your order is placed.
Free Shipping – Australia
We offer Free Shipping on parts orders over $55 within Australia.
If you select Free Freight, your order will generally be sent using Australia Post Standard or another standard delivery service.
Australia Post standard delivery is typically 4–10 business days within Australia.
If delivery time is important, we recommend selecting one of our paid express freight services.
Please note:
- Certain items do not qualify for Free Freight. Please refer to the product description for details.
- Dangerous goods, oils, lubricants, DeFOUL, Propspeed products, batteries, and certain oversized items may be excluded from Free Freight and may require road freight services.
Order Tracking
Once your order has been dispatched, you will receive an email containing your tracking number and carrier information.
Who Do You Ship With?
We ship using:
- Australia Post
- StarTrack
- Team Global Express
- UPS
- DHL Express
- FedEx
- TNT
- Couriers Please
- Freight forwarding and brokerage services such as Transdirect
We have extensive experience shipping throughout Australia and worldwide. We will select the carrier we believe is most suitable for your location and the type of goods being shipped.
If you would prefer to use your own carrier account or would like to discuss shipping options, please contact us.
International Orders
We ship worldwide.
International orders may be subject to import duties, taxes, VAT/GST, customs clearance fees, brokerage charges, and other fees imposed by the destination country.
These charges are not included in the product price or shipping cost displayed at checkout and are the responsibility of the recipient.
Customs regulations vary by country. In some cases, customs authorities may require additional information such as a passport number, national identification number, tax identification number, or business registration number before a shipment can be cleared for delivery.
If you are unsure what charges may apply in your country, we recommend contacting your local customs office before placing an order.
