Black Heat Shrink Tubing 2:1 Ratio | 30–100mm

Black Heat Shrink Tubing 2:1 Ratio — Electrical Wire Sleeving, 30mm–100mm Diameter

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Black Heat Shrink Tubing 2:1 Ratio — Reliable Insulation for Automotive, Marine & Electrical Wiring

Whether you're rewiring a vehicle, bundling cables in a control panel, or protecting exposed conductors from moisture and abrasion, finding heat shrink tubing that fits large-diameter wires without splitting or sliding is a constant frustration. Electricians, automotive technicians, and serious DIYers need tubing that goes on easily, shrinks uniformly, and stays put for years.

This black heat shrink tubing is available in ten diameters — 30mm (approx. 1.18"), 35mm (approx. 1.38"), 40mm (approx. 1.57"), 45mm (approx. 1.77"), 50mm (approx. 1.97"), 60mm (approx. 2.36"), 70mm (approx. 2.76"), 80mm (approx. 3.15"), 90mm (approx. 3.54"), and 100mm (approx. 3.94") — and in lengths of 1M (approx. 3.3 ft), 2M (approx. 6.6 ft), 3M (approx. 9.8 ft), and a 48M (approx. 157 ft) bulk roll. Made from flame-retardant polyolefin with a 2:1 shrink ratio, it conforms tightly to the underlying wire or bundle when heated to approximately 90-120 degrees C (194-248 degrees F).

Typical applications include automotive wiring harness repair and protection, marine cable management where moisture resistance is critical, industrial control panel wire bundling, and large-gauge home electrical projects requiring heat shrink wire insulation for cables too wide for standard tubing sizes.

iCompatibility Note: Verify your cable's outer diameter before ordering — the pre-shrink diameter should be at least 10-20% larger than the cable OD. The 2:1 ratio means each size shrinks to approximately half its listed diameter.

Key Features of These Black Heat Shrink Tubes

🔥2:1 Shrink Ratio — Shrinks to approximately half its original diameter, creating a snug, uniform fit around wire bundles, connectors, and terminals without gaps or wrinkles.
🛡Flame-Retardant Polyolefin — Made from self-extinguishing polyolefin material that resists ignition and stops burning when the heat source is removed, meeting general electrical insulation safety requirements.
📏Wide Diameter Range — Ten sizes from 30mm to 100mm cover everything from thick automotive wiring harnesses to large industrial cable bundles, eliminating the need to source multiple products.
💧Moisture and Abrasion Resistance — The shrunk tubing forms a protective barrier against moisture ingress, dust, and mechanical abrasion, making it suitable for automotive, marine, and outdoor electrical cable sleeving.
✂Easy to Cut and Install — Cuts cleanly with scissors or a utility knife; slides over cables before connectors are attached and shrinks evenly with a standard heat gun, no special tools required.
📦Flexible Length Options — Choose 1M, 2M, or 3M for targeted repairs, or the 48M bulk roll for large-scale wiring projects and professional installers who need heat shrink tubing in quantity.

Technical Specifications — Black Heat Shrink Tubing

Material	Flame-retardant polyolefin
Color	Black
Shrink Ratio	2:1
Available Diameters (pre-shrink)	30mm (1.18"), 35mm (1.38"), 40mm (1.57"), 45mm (1.77"), 50mm (1.97"), 60mm (2.36"), 70mm (2.76"), 80mm (3.15"), 90mm (3.54"), 100mm (3.94")
Available Lengths	1M (3.3 ft), 2M (6.6 ft), 3M (9.8 ft), 48M (157 ft)
Activation Temperature	Typically 90 degrees C (194F); full shrink at approx. 120 degrees C (248F)
Wall Thickness (post-shrink)	See variant options
Tensile Strength	Contact us to confirm
Operating Temperature Range	Typically -55 degrees C to +125 degrees C (-67F to +257F)
Flame Rating	Generally UL 224 compliant — contact us to confirm for your application
Recommended Tool	Heat gun (open flame not recommended)

!Spec Confirmation: Wall thickness, exact tensile strength, and certification documentation vary by production batch. Contact us before ordering for safety-critical or regulated applications.

Frequently Asked Questions

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

Measure the outer diameter of the wire or bundle you need to cover, then choose a tubing size whose pre-shrink diameter is at least 10-20% larger than that measurement. With a 2:1 shrink ratio, the tubing will shrink to roughly half its listed diameter when heat is applied. For example, 30mm (approx. 1.18") tubing will shrink to approximately 15mm (approx. 0.59").

What shrink ratio does this tubing use, and what does that mean?

This tubing uses a 2:1 shrink ratio, meaning it shrinks to approximately half its original diameter when heated. This is the most common ratio for general-purpose electrical insulation and wire bundling. It provides a firm, conforming fit without requiring the extreme heat needed for higher-ratio tubing.

Can this heat shrink tubing be used outdoors or in automotive environments?

Yes. This tubing is generally suitable for automotive wiring harnesses, marine cable management, and outdoor electrical installations. It typically resists UV exposure and moisture. For prolonged submersion or exposure to fuels and solvents, please contact us to confirm suitability for your specific environment.

Is this tubing flame-retardant and electrically safe?

This tubing is generally manufactured from flame-retardant polyolefin, which self-extinguishes when the heat source is removed. It is typically compliant with UL 224 standards for electrical insulation. Contact us to confirm specific certifications if your project requires documented compliance.

What temperature is needed to shrink this tubing, and what tool should I use?

Most polyolefin 2:1 heat shrink tubing activates at approximately 90 degrees C (194F) and achieves full shrinkage around 120 degrees C (248F). A heat gun is the recommended tool — move it steadily along the tubing to shrink evenly from one end to the other. Avoid open flames, which can cause uneven shrinkage or scorching.

How do I convert the diameter sizes to inches?

Approximate inch equivalents for each pre-shrink diameter: 30mm = 1.18", 35mm = 1.38", 40mm = 1.57", 45mm = 1.77", 50mm = 1.97", 60mm = 2.36", 70mm = 2.76", 80mm = 3.15", 90mm = 3.54", 100mm = 3.94".

Can I cut this tubing to a custom length?

Yes. The tubing cuts cleanly with standard scissors or a utility knife before or after shrinking. The 1M, 2M, and 3M options let you buy only what you need for a specific repair or project, while the 48M bulk roll is ideal for large-scale wiring jobs or professional installers who regularly need large-diameter heat shrink wire sleeving.

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