Applies to determination per unit area of resilient materials with smooth surfaces used in a continuous layer. It does not apply to loadings lower than 0,4 kPa or greater than 4 kPa.

This part of ISO 9052 specifies the test method for determining the dynamic stiffness of resilient materials used under floating floors. Dynamic stiffness is one of the parameters that determine the sound insulation of such floors in dwellings.

This part of ISO 9052 applies to the determination of dynamic stiffness per unit area of resilient materials with smooth surfaces (see clause 6) used in a continuous layer under floating floors in dwellings. It does not apply to loadings lower than 0,4 kPa¹⁾, for example materials in wall linings, or greater than 4 kPa¹⁾, for example materials under machinery foundations (see note 2).

This part of ISO 9052 is mainly intended to be used for comparing production samples of similar materials of known specified quality.

For restrictions concerning the airflow resistivity of the resilient material to be tested, see 8.2.

NOTE 1 The dependence of dynamic stiffness on prestatic load is of minor importance in the case of materials usually applied in wall linings, for example polystyrene or mineral fibre. The differences between dynamic stiffness values measured with a static load of 2 kPa in accordance with this part of ISO 9052 and those measured with a very low preload are of the order of 10 % to 20 %.

NOTE 2 A further part of ISO 9052 will deal with the determination of dynamic stiffness of materials used in technical floating floors (high static load).