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A foam balloon is a special type of a gas-filled balloon. Strictly speaking a foam balloon is not a balloon, as it has no envelope, but consists of an organic material up-foamed with hydrogen or helium. Thus foam balloons cannot burst. However their carrying capacity is smaller than hat of normal balloons. Foam balloons are manufactured as a rule directly at the place of the ascent with a special machine. The form of the foam balloon can be varied hereby. It is possible to create foam balloons with diameter of more than 1 meter. Identical foam balloons can be manufactured with the same machine in short repetition periods. Foam balloons are used frequently for advertising purposes, since they can be manufactured easily in the form of company symbols. In principle also wind conditions in the lower atmosphere can be easily monitored with their aid. Foam balloons are not long-term stable, but decay after some hours. Nevertheless they can reach heights of several kilometers.
