Purple Heat Shrink Tubing 2:1 — φ1.5mm to φ50mm | Electrical Wire Sleeve

Measure the outer diameter of the wire or connector before shrinking. Choose a tubing diameter that is typically 20–30% larger than the object you want to cover. For example, a 4mm wire generally works well with φ5mm or φ6mm tubing. After heat is applied, the tubing shrinks to approximately half its original diameter (2:1 ratio), creating a snug fit.

A 2:1 shrink ratio means the tubing will shrink to approximately half its original inner diameter when heat is applied. For example, φ10mm tubing will shrink down to roughly φ5mm, creating a snug, protective sleeve around your wire or component. This ratio is the most common for general-purpose electrical insulation work.

This tubing is generally activated at temperatures around 70–120°C (158–248°F). A heat gun is the recommended tool for even, controlled shrinkage. Avoid open flames where possible, as uneven heat can cause bubbling or uneven shrinkage. Keep the heat gun moving steadily along the tubing for best results.

This tubing is generally suitable for light outdoor use where it is not continuously submerged in water. Once properly shrunk, it provides a moisture-resistant barrier that protects connections from humidity and splashing. For harsh outdoor, marine, or underground environments, we recommend contacting us to confirm suitability before purchase.

Yes. The wide diameter range (φ1.5mm to φ50mm) covers most standard AWG wire gauges used in automotive, electronics, and home wiring projects. Smaller diameters (φ1.5–3mm) typically suit 22–18 AWG wires, while larger sizes (φ10mm and above) are suited for heavier cables, battery terminals, and large connectors.

Measure the total length of wire or cable you need to cover, then add 10–15% extra for trimming and overlap at each end. For small repairs or single-wire jobs, a 5-meter roll is generally sufficient. For larger wiring harness projects, automotive builds, or bulk workshop use, 20–50 meter rolls offer better value per meter and reduce the need for frequent reordering.

Purple is commonly used as a color-coding standard in wiring systems to identify specific circuits, phases, or wire functions at a glance — without needing adhesive labels that can fall off over time. It is especially useful in automotive, marine, and industrial wiring where quick visual identification reduces troubleshooting time and helps prevent miswiring during repairs.