2:1 Heat Shrink Tubing – Electrical Cable Sleeving, Dia. 1mm–210mm, 7 Colors

Measure the outer diameter of the wire or connector before shrinking. Choose a tubing diameter that is generally 20–30% larger than the object so it slides on easily. After heat is applied, the tubing shrinks to approximately half its original diameter (2:1 ratio), creating a snug, secure fit. For example, if your wire bundle measures 8mm across, a 10mm tube would typically work well.

A 2:1 shrink ratio means the tubing will shrink to approximately 50% of its original supplied diameter when heat is applied. For example, a 10mm tube will shrink down to roughly 5mm, conforming tightly around the wire or component. This ratio is the most common for general-purpose electrical insulation and wire bundling.

This polyolefin heat shrink tubing typically activates at around 70–90°C (158–194°F) and fully shrinks at approximately 120°C (248°F). A heat gun is recommended for even, controlled shrinkage. Move the heat gun slowly along the tubing from one end to the other to avoid bubbling or uneven shrinkage. A lighter can be used carefully in a pinch, but a heat gun gives the best results.

Yes. Polyolefin heat shrink tubing is generally resistant to moisture, mild chemicals, and UV exposure, making it suitable for automotive wiring harness repairs, marine electrical connections, and outdoor electrical projects. For harsh or submerged environments, we recommend confirming the specific variant's rating or considering adhesive-lined (3:1) tubing for a fully waterproof seal.

Yes. This heat shrink tubing is made from flame-retardant polyolefin material, which helps prevent the spread of fire along wiring. It meets general electrical safety standards for insulation and wire bundling applications. It is widely used in automotive, marine, industrial, and consumer electronics wiring.

Absolutely. With diameters ranging from 1mm (≈3/64") to 210mm (≈8.3"), this product covers everything from delicate signal wires and PCB leads to large power cables, conduit bundles, and pipe insulation. Select the diameter that is approximately 20–30% larger than your cable's outer diameter for the best fit before shrinking.

Available colors include White, Red, Green, Blue, Transparent, Yellow, and Black. Color-coding wiring with heat shrink tubing is a widely used practice in automotive, marine, and industrial wiring to identify circuits at a glance — reducing troubleshooting time and wiring errors. Transparent tubing is useful when you need to see the wire or connector underneath after shrinking.