| Density Class PAC – 4 | 
         
             | PAC Hourdi Thickness 20 cm | 40 | 
         
             | PAC Hourdi Thickness 25 cm | 42 | 
     
Note: Testing performed at acoustic System, Inc. Austin TX in accordance with ASTM (90) Standard Method for
 Laboratory Measurement of Airbome Soung Transmission Loss of Building Partitions.