2:1 Heat Shrink Tubing — Reliable Electrical Insulation for Every Wire Size
Whether you're rewiring a car, repairing a marine electrical system, or organizing a home workshop project, exposed wire connections are a safety hazard you can't ignore. Electricians, automotive technicians, and serious DIYers all need a fast, clean way to insulate splices, protect terminals, and bundle cables — without the bulk of electrical tape that unravels over time.
This 2:1 heat shrink tubing is sold by the meter in a wide range of unshrunk diameters from φ1mm (≈3/64") to φ50mm (≈2"), and in lengths of 1M (≈3.3 ft), 2M (≈6.6 ft), 5M (≈16.4 ft), 10M (≈32.8 ft), and 20M (≈65.6 ft). Each piece is made from flame-retardant polyolefin and is available in five colors: Brown, Orange, Purple, Grey, and Yellow & Green. The 2:1 shrink ratio means the tubing shrinks to approximately half its listed diameter when heat is applied.
Typical applications include automotive wire harness repair and heat shrink tubing for car wiring, marine and boat electrical connections, DIY electronics projects, battery terminal insulation, and cable management in control panels. The color-coded options make it easy to follow standard wire identification practices on any job.
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Compatibility Note: This tubing is compatible with copper, aluminum, and tinned wire conductors. It works with standard heat guns, soldering station hot-air attachments, and heat lighters. Not recommended for use with PVC-insulated wires in high-temperature environments above 105°C (221°F).
✅ Key Features of These 2:1 Heat Shrink Tubing Sleeves
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🔥2:1 Shrink Ratio — Shrinks to approximately half its unshrunk diameter, creating a snug, form-fitting seal around wires, connectors, and terminals without gaps or loose ends.
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🛡️Flame-Retardant Polyolefin — Made from self-extinguishing polyolefin material that resists ignition, making it a dependable choice for automotive wiring harness protection and under-hood cable insulation.
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📏Wide Size Range — Available in 23 unshrunk diameters from φ1mm to φ50mm, covering everything from fine instrument wire to large battery cables and conduit ends.
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🎨5 Color Options — Brown, Orange, Purple, Grey, and Yellow & Green allow color-coded wire identification, helping technicians follow wiring diagrams and electrical safety standards at a glance.
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💧Moisture-Resistant Insulation — Once shrunk, the tubing forms a tight barrier against moisture, dust, and abrasion, extending the service life of splices and connections in damp or dirty environments.
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✂️Cut-to-Length Flexibility — Sold in 1M, 2M, 5M, 10M, and 20M lengths so you can buy exactly what you need for small repairs or large wiring projects without waste.
📐 Technical Specifications — 2:1 Heat Shrink Tubing
| Material |
Flame-retardant polyolefin |
| Shrink Ratio |
2:1 |
| Unshrunk Diameter Range |
φ1mm (≈3/64") – φ50mm (≈2") |
| Available Lengths |
1M (≈3.3 ft), 2M (≈6.6 ft), 5M (≈16.4 ft), 10M (≈32.8 ft), 20M (≈65.6 ft) |
| Colors |
Brown, Orange, Purple, Grey, Yellow & Green |
| Shrink Temperature (Typical) |
Typically begins at ~90°C (194°F); full shrink at ~120°C (248°F) |
| Operating Temperature Range |
Typically -55°C to +105°C (-67°F to +221°F) |
| Voltage Rating (Typical) |
Up to 600V (contact us to confirm for your application) |
| Flame Retardancy |
Self-extinguishing per UL 224 / VW-1 standard (typically) |
| Wall Thickness (Unshrunk) |
See variant options |
| Recommended Tool |
Heat gun or hot-air station |
| Typical Applications |
Automotive wiring, marine electrical, electronics, DIY cable management |
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Size Selection Tip: Choose an unshrunk diameter that is 20–30% larger than the widest point of the object you are covering. The tubing will shrink to approximately half the listed diameter. If you are unsure, contact us before ordering.
❓ Frequently Asked Questions
How do I choose the right diameter of heat shrink tubing?
Select a diameter that is at least 20–30% larger than the outer diameter of the wire or connector you need to cover. With a 2:1 shrink ratio, the tubing will shrink to approximately half its listed (unshrunk) diameter. For example, φ6mm (≈1/4") tubing will shrink to roughly 3mm (≈1/8"). Always measure the widest point of the object being covered before selecting a size.
What temperature is needed to shrink this tubing?
This tubing typically requires a temperature of around 90°C (194°F) to begin shrinking and generally reaches full shrinkage at approximately 120°C (248°F). A heat gun is the recommended tool. Avoid open flames, which can cause uneven shrinkage or scorching of the tubing surface.
Is this heat shrink tubing flame-retardant and safe for automotive wiring?
Yes. This tubing is generally made from flame-retardant polyolefin material, making it suitable for automotive, marine, and other environments where fire resistance is important. It is commonly used for car wiring harnesses, battery terminals, and under-hood cable protection where heat shrink tubing for car wiring is required.
Can this tubing be used outdoors or in wet environments?
Standard 2:1 polyolefin heat shrink tubing provides good moisture resistance once shrunk, making it suitable for most indoor and light outdoor applications. For fully waterproof or submersible applications, we recommend using adhesive-lined (3:1 or 4:1) heat shrink tubing instead, which creates a sealed barrier against water ingress.
What is the voltage rating of this heat shrink tubing?
Standard polyolefin 2:1 heat shrink tubing typically carries a voltage rating of up to 600V. This makes it suitable for most low-voltage automotive, household, and electronics wiring applications. Contact us to confirm the exact rating for your specific use case before use in high-voltage environments.
How much length should I cut for each application?
As a general rule, cut the tubing about 10–20% longer than the area you need to cover, as heat shrink tubing typically shrinks slightly in length as well as diameter during the heating process. For example, if you need to cover 50mm (≈2") of wire, cut approximately 55–60mm (≈2.2–2.4") of tubing to ensure full coverage after shrinkage.
What colors are available and do they have different electrical properties?
This tubing is available in Brown, Orange, Purple, Grey, and Yellow & Green. All colors share the same electrical and mechanical properties — color choice is primarily for wire identification and organization. Yellow & Green is the internationally recognized color code for ground/earth wires in many wiring standards, making it a practical choice for grounding applications.
🛒 Select your color, diameter, and length above, then add to cart — ships from our US warehouse.
