2:1 PVC Heat Shrink Tubing — 7mm to 500mm, White/Black/Clear/Green, 1M

Measure the outer diameter of your wire or cable bundle. The flat width listed (e.g., 7mm flat = φ4mm inner) represents the tubing before shrinking. Choose a size whose pre-shrink inner diameter is slightly larger than your cable so it slides on easily. After applying heat, it shrinks to approximately half the original diameter (2:1 ratio). For example, a 12mm flat width (φ7mm) will shrink down to roughly φ3.5mm. When in doubt, size up by one step.

A 2:1 shrink ratio means the tubing shrinks to approximately half its original inner diameter when heat is applied. For example, a tube with a 10mm pre-shrink inner diameter will shrink to roughly 5mm. This ratio is generally sufficient for most wire insulation, connector sealing, and cable bundling applications.

PVC heat shrink tubing typically activates at around 70–90°C (158–194°F). A heat gun set to low or medium is the most reliable tool for even shrinkage. You can also use a lighter or hair dryer in a pinch, though a heat gun gives the most consistent results. Avoid direct flame contact to prevent scorching or uneven shrinkage.

PVC heat shrink tubing provides basic moisture resistance and is generally suitable for indoor and light-duty outdoor use. However, it is not waterproof or UV-stabilized for prolonged direct sun exposure. For harsh outdoor, marine, or high-moisture environments, consider adhesive-lined polyolefin tubing instead. Contact us to confirm suitability for your specific application.

Yes, PVC heat shrink tubing is commonly used for automotive wire splices, connector insulation, and harness organization. It is generally rated for temperatures up to around 105°C (221°F) in short-term exposure. For engine bay applications near high heat sources, verify the operating temperature range matches your needs before installation.

Color choice is typically based on your wiring convention or personal preference. White and Black are the most common for general electrical work. Clear is useful when you want to see the wire or label underneath the sleeve. Green is often used for grounding conductors or color-coded identification in multi-wire systems. All four colors share the same 2:1 shrink ratio and PVC material properties.

PVC heat shrink tubing typically experiences minimal longitudinal (lengthwise) shrinkage — generally less than 5–10% in most cases. The primary shrinkage is radial (diameter). Plan your cut length with a small buffer to account for any lengthwise change, especially on longer runs.