13mm Heat Shrink Tubing 2:1 — Electrical Insulation Sleeving, 7 Colors

Measure the total cable run you need to cover and add 10–15% extra for trimming and overlap. For a single workbench project, 1 m (≈3.3 ft) is typically enough. For automotive wiring harnesses or panel builds, 5–10 m rolls are generally more economical. Longer 15–30 m rolls suit production runs or contractors who need consistent stock on hand.

A 2:1 ratio means the tubing shrinks to half its original diameter when heat is applied. This 13mm tubing will typically shrink down to approximately 6.5mm (≈1/4"), creating a snug, insulating sleeve around the conductor or connector. It does not shrink lengthwise significantly, so cut your pieces slightly longer than needed.

The 13mm inner diameter (before shrinking) typically accommodates cable bundles or connectors up to about 12mm (≈15/32") in diameter. After shrinking, it fits snugly around conductors down to approximately 6.5mm. Always measure your cable's outer diameter before selecting a size — the tubing should slide over the cable easily before heat is applied.

Standard polyolefin heat shrink tubing generally provides good UV and moisture resistance for short-term outdoor exposure. For long-term outdoor, underground, or marine applications where a watertight seal is critical, an adhesive-lined (3:1) variant is generally recommended. Contact us to confirm suitability for your specific environment.

Polyolefin heat shrink tubing in this category typically activates at around 70–90°C (158–194°F) and fully shrinks at approximately 120°C (248°F). A heat gun set to low-to-medium is generally the best tool — move it steadily along the tubing for even shrinkage. Avoid open flames, which can scorch or unevenly shrink the material.

This heat shrink tubing is made from polyolefin, which is generally RoHS-compliant and flame-retardant, making it suitable for standard electrical insulation, wire bundling, and strain relief. For projects requiring specific certifications (UL, CSA, MIL-SPEC), contact us to confirm compliance documentation before ordering.

Color choice is typically driven by wiring convention or personal preference. In automotive and electrical work, Black is commonly used for ground/negative wires, Red for positive/live, and other colors for signal or auxiliary circuits. Transparent is useful when you want to keep the wire's original color or markings visible after shrinking. There is no electrical difference between colors.

While a lighter can technically shrink polyolefin tubing, it is not recommended. Open flames produce uneven heat, can scorch or melt the tubing, and may leave soot on the insulation. A heat gun — or even a hair dryer on its highest setting — gives more consistent, professional results and reduces the risk of damaging the cable underneath.