Blue PVC Heat Shrink Tubing for 18650 Battery Packs & RC Wiring — 7mm to 625mm Wide

Measure the outer diameter of your battery cell or wire bundle, then select a flat width that is roughly 1.2–1.5× that measurement. For example, a standard 18650 cell (≈18mm diameter) typically fits well in the 27mm–31mm flat-width options. The Φ value shown in each variant name is the approximate recovered inner diameter after shrinking — use that as your primary reference. When in doubt, size up to the next option for easier installation.

This PVC heat shrink tubing generally has a shrink ratio of approximately 2:1, meaning it shrinks to roughly half its original flat-width diameter when heated evenly. The exact ratio can vary slightly by size. For critical fits, test a short sample piece before cutting your full length.

PVC heat shrink typically activates at temperatures between 70°C–120°C (158°F–248°F). A heat gun on a low-to-medium setting works well for most sizes. Move the heat gun steadily along the tubing to avoid hot spots. Avoid open flames — they can cause uneven shrinking, discoloration, or damage to the material and underlying components.

This is standard PVC heat shrink tubing, which provides basic electrical insulation and abrasion protection. It is generally not rated for fully waterproof or submersion applications. For outdoor use with significant moisture exposure, consider pairing with adhesive-lined (dual-wall) heat shrink or additional sealing methods. Contact us to confirm suitability for your specific environment.

Yes — this is one of the most common uses for this tubing. It is widely used for wrapping individual 18650 and 21700 lithium-ion cells as well as assembled multi-cell packs. It provides electrical insulation and a clean, professional finish. Ensure the flat width you select corresponds to a Φ value that is slightly larger than your pack's outer diameter before applying heat.

Available in 2m (≈6.6 ft), 5m (≈16.4 ft), and 10m (≈32.8 ft) rolls. For wrapping individual 18650 cells, a 2m roll is generally sufficient for multiple cells. For larger RC wiring harnesses, battery sled builds, or bulk production runs, the 5m or 10m options offer better value per meter. Measure your total coverage needs and add approximately 10–15% for trimming and waste.

Yes. The smaller diameter options — typically 7mm–31mm flat width — are well-suited for RC vehicle wiring, servo leads, ESC power leads, and connector strain relief. Larger sizes cover multi-cell packs and thicker cable bundles used in RC crawlers, drones, and electric skateboards. Select the flat width whose Φ value matches or slightly exceeds your wire bundle's outer diameter.