Technical characteristics of foams:

Volume weight and compression hardness
Foams come in many different types, with different manufacturing methods and basic materials. However, regardless of this, foams are distinguished by two basic properties.

The volume weight, this indicates how much material was used for one cubic meter of foam, it is also called density and is given in kg/m³. A higher volume weight stands for more dimensional stability, permanent elasticity and durability.

In addition to the amount of material used per cubic meter, the degree of hardness of the foam is decisive. This degree of hardness is referred to as compression hardness. By definition, compression hardness is the force required to compress the foam by 40% of its height. This is expressed in is kilopascals (kPa).

For example, a foam definition would be 42/45, where 42 would be the density of 42 kg/m3 and 45 would be the compression hardness of 45 kPa.