Flat width is the measurement of the tubing when pressed flat. 285mm flat width generally corresponds to a pre-shrink diameter of approximately 181mm (≈7.1"). To choose the right size, measure the circumference of your battery pack or object and select tubing whose flat width is slightly larger than half that circumference. When in doubt, size up — the tubing will conform tightly once heat is applied.

PVC heat shrink tubing of this type typically has a shrink ratio of approximately 2:1, meaning it will shrink to roughly half its original diameter when heated. Always verify the final fit on a sample piece before wrapping your full battery pack.

PVC heat shrink tubing generally activates at temperatures between 70°C–120°C (158°F–248°F). A heat gun set to a low or medium setting works best. Avoid open flames, as they can scorch or melt the material unevenly.

PVC heat shrink tubing provides good moisture resistance for general indoor use and light outdoor applications. However, it is not rated for continuous submersion or prolonged UV exposure. For harsh outdoor or marine environments, consider adhesive-lined polyolefin tubing instead.

Yes. This PVC heat shrink sleeve is commonly used to wrap lithium-ion (Li-ion), lithium polymer (LiPo), NiMH, and NiCd battery packs. It provides electrical insulation and a clean finished appearance. Always ensure the battery pack is fully assembled and cool before applying heat.

Use sharp scissors or a utility knife to cut the tubing to your desired length before shrinking. Cut slightly longer than needed — typically add 10–20mm (≈0.4"–0.8") on each end — to allow for any shrinkage along the length and to ensure full coverage of the battery pack.

Both colors offer identical electrical insulation and shrink performance. Black is the most common choice for a clean, professional look and is widely used in RC cars, power tools, and DIY electronics. Blue is popular for color-coding battery packs or adding a distinctive appearance to custom builds.