Before use, the component A must be homogenized, as additives tend to cause phase separation. The density of the material can be adjusted to the processing specification of 0.80 – 0.90 g/ml by adding dispersed air through stirring. The air helps to ensure an uniform foam structure. The component B is very sensitive to moisture and must not be stirred. Due to its high reaction rate, the system is usually processed by two- component mixing and dispensing machines.