1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m
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1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m

1.7:1 Silicone Heat Shrink Tubing — Black, φ0.8mm to φ40mm, 1–20m

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By HomeDIYer®

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$2.69 USD
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In stock (500 units), ready to be shipped

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Description

 

Silicone Heat Shrink Tubing 1.7:1 — Flexible Insulation for Demanding Wiring Jobs

When standard polyolefin tubing fails in the heat, cold, or outdoors, electricians, automotive builders, and DIY enthusiasts reach for silicone. Whether you're protecting a splice in an engine bay, sealing marine wiring against moisture, or bundling cables in an industrial panel, ordinary shrink tubing often cracks, stiffens, or degrades — silicone heat shrink tubing holds up where others don't.

This listing covers black silicone heat shrink tubing with a 1.7:1 shrink ratio, available in unshrunk diameters from φ0.8mm (≈1/32") to φ40mm (≈1-9/16"), and in cut 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 a continuous length of tubing — no joins or splices. The silicone construction provides a wide operating temperature range, typically from -60°C to +200°C (-76°F to +392°F).

Typical use cases include automotive wiring harness protection, marine and outdoor cable insulation, high-temperature appliance wiring, and laboratory or industrial cable management. Long-tail applications such as "silicone heat shrink tubing for high temp wiring" and "flexible heat shrink sleeving for engine bay cables" are exactly what this product is designed for.

ℹ️ Compatibility Note: Select the unshrunk diameter that is 10–20% larger than your cable's outer diameter. After shrinking, the tubing recovers to approximately 59% of its original ID (1.7:1 ratio). Colour available: Black only. Confirm your size using the variant selector above.

✅ Key Features of These Silicone Heat Shrink Tubes

  • 🌡️Wide Temperature Range — Rated for continuous use from typically -60°C to +200°C (-76°F to +392°F), making it a reliable choice for engine bay wiring, industrial equipment, and high-heat appliance cables.
  • 🔄1.7:1 Shrink Ratio — Shrinks to approximately 59% of its original inner diameter, providing a firm, conforming fit over connectors, splices, and wire bundles without over-compressing.
  • 🌊UV, Moisture & Chemical Resistant — Silicone construction resists UV radiation, ozone, water ingress, and common oils and solvents — ideal for outdoor wiring and marine cable sleeving applications.
  • 🤸Stays Flexible After Shrinking — Unlike rigid polyolefin alternatives, silicone remains soft and pliable after recovery, preventing cracking in vibration-heavy or cold-weather environments.
  • 📏Wide Diameter Range — Available from φ0.8mm to φ40mm unshrunk, covering everything from fine instrument wiring to large cable bundles and conduit transitions in a single product line.
  • ⚡Electrically Insulating — Silicone provides solid dielectric insulation for low-to-medium voltage wiring, protecting against short circuits, abrasion, and environmental contamination in electrical sleeving applications.

📐 Technical Specifications — Silicone Heat Shrink Tubing

Material Silicone rubber
Shrink Ratio 1.7:1
Colour Black
Unshrunk Diameter Range φ0.8mm (≈1/32") – φ40mm (≈1-9/16")
Available Lengths 1m, 2m, 5m, 10m, 20m (continuous, no joins)
Shrink Temperature (Typical) Begins at ~120°C (248°F); full recovery by ~150°C (302°F)
Operating Temperature Range (Typical) -60°C to +200°C (-76°F to +392°F)
Longitudinal Shrinkage Minimal (typically <5%)
Flexibility After Shrink Remains soft and pliable
UV & Weather Resistance Yes — suitable for outdoor and marine use
Electrical Insulation Yes — suitable for low-to-medium voltage applications
Wall Thickness (Unshrunk) See variant options
Voltage Rating Contact us to confirm for your specific application
⚠️ Sizing Tip: The diameter listed in each variant is the unshrunk (pre-shrink) inner diameter. Always measure your cable's outer diameter and choose a tubing size that is at least 10–20% larger for easy insertion before applying heat.

❓ Frequently Asked Questions

How do I choose the right diameter for my wire or cable?

Measure the outer diameter of the wire or connector you need to cover. The unshrunk (pre-shrink) diameter should be at least 10–20% larger than your cable's OD to allow easy insertion. After heat is applied, the tubing shrinks to approximately 59% of its original diameter (1.7:1 ratio). For example, φ10mm unshrunk becomes approximately φ5.9mm shrunk. When in doubt, size up.

What temperature is needed to shrink this tubing, and what is its operating range?

Silicone heat shrink tubing typically begins to shrink at around 120°C (248°F) and fully recovers by 150°C (302°F). Once shrunk, it generally withstands continuous operating temperatures from -60°C to +200°C (-76°F to +392°F), making it suitable for high-heat environments such as engine bays and industrial equipment.

Is this tubing suitable for outdoor or harsh-environment use?

Yes. Silicone is inherently resistant to UV radiation, moisture, ozone, and a wide range of chemicals. This makes it well-suited for outdoor wiring, marine applications, and environments with exposure to oils or solvents. It generally maintains flexibility even in freezing temperatures.

What is the shrink ratio and how does it affect fit?

This tubing has a 1.7:1 shrink ratio, meaning it shrinks to approximately 59% of its original (unshrunk) inner diameter when heat is applied. This is a moderate ratio — tighter than standard 2:1 polyolefin tubing — so it is best used when you need a snug but not ultra-tight fit, or when covering connectors with moderate size variation.

Can I use a standard heat gun to apply this tubing?

Yes. A standard variable-temperature heat gun set to 150°C–200°C (302°F–392°F) is generally sufficient. Keep the gun moving to apply heat evenly and avoid scorching. A lighter or open flame can work in a pinch but is not recommended as it may cause uneven shrinkage or surface damage.

How do I choose the right length for my project?

For single repairs or splices, 1m or 2m is typically sufficient. For wiring harness projects, automotive builds, or bulk electrical work, 5m, 10m, or 20m rolls offer better value. Note that silicone tubing does not have significant longitudinal shrinkage, so the length you order is approximately the usable length.

Is silicone heat shrink tubing electrically insulating?

Yes. Silicone is an excellent electrical insulator. This tubing is generally rated for use on low-to-medium voltage wiring applications. For specific dielectric strength values or high-voltage applications, please contact us to confirm suitability before ordering.

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

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