Radiosonde balloons are made either of natural rubber or of natural rubber compound with chemicals. The normal thickness of the balloon inflated for release is from 0.05 to 0.1 mm, decreasing to 0.003 mm at the bursting altitude. The diameter of the balloon is 1–1.5 m on release and it expands to 5–10 m before bursting.
These figures imply that even the smallest damage to the balloon during the preflight preparations will result in premature bursting of the balloon at a low altitude. To reach the maximum height, you must handle the balloon with utmost care during the preflight preparations.
| When handling the balloon, use protective gloves to avoid damaging the balloon surface. Even minor grease stains can damage the balloon, causing premature balloon burst. |