1M PVC Heat Shrink Tubing 70mm–380mm Large Diameter Heat Shrinkable Film Insulation Sleeve

Measure the widest diameter of the object you need to cover. Select a tubing size that is at least 10–20% larger than that measurement so the tubing slides over easily before shrinking. After applying heat, the recovered diameter will generally be approximately half the listed (expanded) size — for example, a 100mm tube typically recovers to around 50mm. If you're between sizes, go larger rather than smaller.

This tubing has a typical 2:1 shrink ratio. To estimate the recovered (after-shrink) diameter, divide the listed expanded diameter by 2. For example, the 150mm (≈5.9") size will generally recover to approximately 75mm (≈2.95"). Actual recovery may vary slightly depending on heat application and the shape of the object being covered.

This PVC heat shrink tubing provides a degree of moisture resistance and is suitable for protected indoor and semi-outdoor use. It is generally not recommended for prolonged direct exposure to UV sunlight, standing water, or harsh outdoor conditions without additional protection. For fully weatherproof applications, consider a dual-wall adhesive-lined heat shrink tubing instead.

A standard heat gun is recommended. The tubing typically activates at 90°C–120°C (194°F–248°F). Move the heat gun evenly along the length of the tubing to achieve uniform shrinkage. An open flame (such as a lighter or torch) is not recommended, as it can scorch or unevenly melt the PVC material.

Yes, this is one of the most common uses for large diameter PVC heat shrink tubing. It is widely used by DIY battery builders to wrap 18650, 21700, and prismatic cell packs for insulation and identification. It is suitable for low-voltage battery assemblies. It is not rated for high-voltage electrical insulation — always verify your application's voltage requirements before use.

Yes. Each piece is supplied as a 1M (≈39.4") length and can be cut to any shorter length with scissors or a utility knife before or after shrinking. This makes it easy to use a single piece for multiple smaller joints or to get the exact coverage length your project requires.

Black is the most commonly used color for general electrical insulation and battery pack wrapping, as it provides a clean, professional finish and is less likely to show wear. Transparent is popular when you want to display labels, cell markings, or internal components through the sleeve. Other colors (red, blue, green, yellow, white) are typically used for color-coding different circuits, voltage levels, or battery groups.