PVC Heat Shrink Tubing for Battery Wraps & Wire Insulation — 7mm to 85mm, 20+ Colors

Measure the outer diameter of your battery cell or wire bundle, then select a flat width that is typically 10–20% larger than that measurement. For example, an 18650 cell (≈18.5mm OD) generally fits the 23mm flat width option, and a 21700 cell (≈21mm OD) generally fits the 27mm flat width. The φ value shown in each variant name is the approximate expanded inner diameter — use that as your primary reference. When in doubt, size up rather than down.

PVC heat shrink tubing typically has a 2:1 shrink ratio, meaning it shrinks to approximately half its original expanded diameter when heat is applied. This is sufficient for most battery re-wrapping and wire insulation tasks. If you need a tighter recovered fit, verify the recovered inner diameter against your component's OD before ordering.

PVC heat shrink tubing generally activates at around 70–90°C (160–195°F). A standard heat gun set to low or medium is the recommended tool. Move the heat gun steadily along the tubing to ensure even shrinkage. Avoid using open flames such as lighters or torches, as these can scorch the PVC or cause uneven shrinking.

PVC heat shrink tubing provides basic moisture resistance and is generally suitable for indoor use and light outdoor exposure. For applications requiring full waterproofing, UV resistance, or extended outdoor exposure, an adhesive-lined polyolefin heat shrink tubing is typically a better choice. If you're unsure, contact us to confirm suitability for your specific environment.

Yes — re-wrapping cylindrical lithium cells is one of the most common uses for this tubing. As a general guide: 18650 cells (≈18.5mm OD) → 23mm flat width; 21700 cells (≈21mm OD) → 27mm flat width; 26650 cells (≈26mm OD) → 31mm flat width. Always confirm the cell's exact outer diameter against the φ specification before ordering.

Each order includes 1 meter (≈39.4 inches) of tubing in your selected flat width and color. For larger projects — such as wrapping a full 18650 battery pack — simply add multiple units to your cart. Each 18650 cell typically requires about 70–75mm of tubing per cell.

Over 20 colors are available, including Black, White, Clear, Red, Blue, Green, Yellow, Orange, Purple, Pink, Gold, Silver Gray, Army Green, Sky Blue, Fruit Green, and more. Each variant is a separate SKU, so to mix colors simply add each color as a separate line item to your cart.