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home > Blue Heat Shrink Tubing – 2:1 / 3:1 / 4:1 Ratio, Φ0.6mm–Φ80mm, Wire & Cable Sleeving > Blue Heat Shrink Tubing – 2:1 / 3:1 / 4:1 Ratio, Φ0.6mm–Φ80mm, Wire & Cable Sleeving

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Blue Heat Shrink Tubing – 2:1 / 3:1 / 4:1 Ratio, Φ0.6mm–Φ80mm, Wire & Cable SleevingBlue Heat Shrink Tubing Reliable Insulation for Wire & Cable Sleeving Loose wire ends, exposed splices, and unprotected connectors are a safety hazard in any electrical project whether you're rewiring a car, building a marine harness, or tidying up a home workshop. This blue heat shrink tubing gives DIYers, electricians, and hobbyists a clean, durable way to insulate, protect, and identify wiring in seconds. Each listing covers a wide range of

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Blue Heat Shrink Tubing — Reliable Insulation for Wire & Cable Sleeving

Loose wire ends, exposed splices, and unprotected connectors are a safety hazard in any electrical project — whether you're rewiring a car, building a marine harness, or tidying up a home workshop. This blue heat shrink tubing gives DIYers, electricians, and hobbyists a clean, durable way to insulate, protect, and identify wiring in seconds.

Each listing covers a wide range of configurations: the 2:1 ratio (without adhesive) is available in diameters from Φ0.6mm (≈0.024") to Φ80mm (≈3.15"); the 3:1 ratio (with adhesive) runs from Φ1.6mm (≈1/16") to Φ39mm (≈1.5"); and the 4:1 ratio (with adhesive) covers Φ4mm (≈5/32") to Φ16mm (≈5/8"). Length options range from 1M to 50M per order. The tubing is made from flexible polyolefin, which is resistant to abrasion, mild chemicals, and UV exposure.

Typical use cases include automotive wire repair and loom protection, marine and outdoor cable sealing (adhesive-lined variants), electronics prototyping and PCB lead insulation, and color-coded wire identification in control panels and junction boxes.

ℹ️ Compatibility note: This tubing fits standard round cables and wires. For irregular or flat connectors, choose a diameter at least 20% larger than the widest point. Adhesive-lined options (3:1 and 4:1) require a heat gun capable of reaching approximately 120°C (248°F) for full adhesive activation.

✅ Key Features of These Blue Heat Shrink Tubes

🔵Three Shrink Ratios in One Listing — Choose 2:1 (non-adhesive) for standard wire insulation, 3:1 or 4:1 (adhesive-lined) for waterproof sealing around connectors and splices.
📏Wide Diameter Range — Sizes from Φ0.6mm to Φ80mm cover everything from fine instrument wire to large battery cables and conduit ends.
💧Adhesive Inner Lining (3:1 & 4:1) — The hot-melt adhesive flows into gaps when heated, forming a moisture-resistant seal suited for marine, automotive, and outdoor cable sleeving.
🔥Polyolefin Construction — Flexible even after shrinking, resistant to abrasion and mild chemicals, and rated for typical low-voltage electrical insulation applications.
🎨Consistent Blue Color — Useful for color-coded wiring systems; the blue finish remains stable after heat application and does not fade under normal indoor or sheltered outdoor conditions.
📦Flexible Length Options — Available in 1M, 2M, 5M, 10M, 20M, and 50M cuts so you can order exactly what your project needs without excess waste.

📐 Technical Specifications — Heat Shrink Tubing

Material	Polyolefin
Color	Blue
Shrink Ratios Available	2:1 (no adhesive), 3:1 (adhesive-lined), 4:1 (adhesive-lined)
Diameter Range (before shrink)	Φ0.6mm–Φ80mm (≈0.024"–3.15")
Typical Shrink Temperature	Begins ~70–90°C (158–194°F); full recovery ~120°C (248°F)
Length Options	1M, 2M, 5M, 10M, 20M, 50M
Inner Adhesive (3:1 & 4:1)	Hot-melt adhesive lining for moisture sealing
Flexibility After Shrink	Remains flexible; does not become brittle
Voltage Rating	See variant options / Contact us to confirm for specific applications
Operating Temperature Range	Contact us to confirm for your specific use case

⚠️ Size tip: Always measure the cable's outer diameter before ordering. The listed diameter is the before-shrink (expanded) size. After full heat recovery, a 2:1 tube shrinks to approximately half that diameter.

❓ 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. For a 2:1 ratio tube, choose a size that is at least 1.1× the cable diameter so it slides on easily, then shrinks to a snug fit. For example, a Φ6mm (≈1/4") tube typically fits cables up to about 5.5mm before shrinking. When in doubt, size up one step.

What is the difference between 2:1, 3:1, and 4:1 shrink ratios?

The ratio describes how much the tubing shrinks in diameter when heat is applied. A 2:1 tube shrinks to half its original diameter — ideal for standard wire insulation. A 3:1 or 4:1 tube shrinks more aggressively and is generally used for irregular shapes, connectors, or applications where a tighter, more conforming fit is needed. The 3:1 and 4:1 options in this listing include an inner adhesive lining for a waterproof seal.

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

The 3:1 and 4:1 adhesive-lined variants are generally suitable for outdoor and moisture-exposed applications. When heated, the inner adhesive melts and flows around the cable, creating a seal that resists water ingress. The 2:1 non-adhesive version provides insulation and abrasion protection but is not rated as a waterproof seal on its own.

What temperature is needed to shrink this tubing?

Polyolefin heat shrink tubing of this type typically begins to shrink at around 70–90°C (158–194°F) and fully recovers at approximately 120°C (248°F). A heat gun set to low or medium is the recommended tool. Avoid open flames, which can scorch or uneven-shrink the tubing.

Is this tubing compatible with automotive wiring and marine applications?

Yes, polyolefin heat shrink tubing is widely used in automotive, marine, and industrial wiring. The adhesive-lined 3:1 and 4:1 options are particularly suited for these environments because they resist vibration, moisture, and mild chemical exposure. Always verify the specific voltage and temperature ratings match your application requirements.

How do I convert the diameter sizes from mm to inches?

Divide the mm value by 25.4 to get inches. Common conversions: Φ6mm ≈ 1/4", Φ12mm ≈ 1/2", Φ25mm ≈ 1", Φ50mm ≈ 2". For sizes in between, use the formula: inches = mm ÷ 25.4.

How much length do I need for my project?

For single repairs or small jobs, 1M or 2M lengths are typically sufficient. For wiring harnesses, automotive builds, or workshop stock, 5M, 10M, or 20M rolls offer better value. Bulk 50M rolls are suited for professional or production use.

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

Blue Heat Shrink Tubing – 2:1 / 3:1 / 4:1 Ratio, Φ0.6mm–Φ80mm, Wire & Cable Sleeving

Name: Blue Heat Shrink Tubing – 2:1 / 3:1 / 4:1 Ratio, Φ0.6mm–Φ80mm, Wire & Cable Sleeving
Brand: plataformaevia.es
SKU: 78152975930
Price: 94.00 USD
Availability: InStock
Rating: 4.6642 (678 reviews)