Calibrating Tests for Hailpad Properties

The performance tests for the hailpad made by polystyrene material were done in laboratory. From 1988 to 1998 hailpad were used in the field obsevation for sampling hailstones. It was showed that the hailpad almost could not absorbe water and but could stand wind , rain and sunshine in out-door conditions.The polystyrene material was uniform and its elasticity was small .The hail trace size on it was used to estimate the real size of hailstone and the average errors were from 4.3% to 12.2%. Therefore ,the diameter and number density of hailstone could be measured accurately.

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