Measure the total length of your battery pack and add at least 10–15% extra for overlap and shrinkage. For example, a 900mm (≈35.4") pack would typically need 1 meter of tubing. Longer packs or those requiring double-layer coverage should order 2 meters or more.

PVC heat shrink tubing generally has a 2:1 shrink ratio, meaning it shrinks to approximately half its original flat width when heat is applied. The 268mm flat width typically yields a recovered diameter suitable for large cylindrical battery packs. Exact recovered dimensions depend on the specific batch — contact us to confirm for critical applications.

PVC heat shrink tubing is generally rated for continuous use up to around 105°C (221°F), which is sufficient for most battery pack applications under normal operating conditions. For high-discharge or high-temperature environments, confirm your pack's thermal output before use.

Standard PVC heat shrink tubing provides basic moisture resistance and is suitable for indoor and light outdoor use. It is not a waterproof adhesive-lined tubing. For fully waterproof or submersion applications, a dual-wall adhesive-lined heat shrink is recommended instead.

A heat gun is the most reliable tool for shrinking large-diameter PVC tubing evenly. Move the heat gun slowly and evenly around the tubing to avoid scorching. A hair dryer may work for thin-walled tubing but is generally less effective on larger diameters like 268mm flat width.

No — both black and blue variants are made from the same PVC material with identical electrical insulation and shrink properties. Color choice is purely for identification, organization, or aesthetic preference in your battery build.

A 268mm flat width corresponds to a recovered circumference that generally fits battery packs with an outer diameter in the range of approximately 150–160mm (≈5.9–6.3") after shrinking, depending on wall thickness. Contact us to confirm fit for your specific pack dimensions.