This document specifies the equipment and test method for determining the effects of successive cycling from dry conditions at "20 °C to wet conditions at 20 °C on the mechanical properties and moisture content of the product. It is applicable to thermal insulating products. The propose of this document is to simulate the freeze thaw effects on thermal insulating products which are frequently exposed to water and low temperature conditions, e.g. inverted roofs and unprotected ground insulation. The test is to be performed continuously using an automatic process of cycling between the specified conditions. This test method is not recommended for all thermal insulating products. If relevant, the product standards will state for which products this International Standard is applicable.