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Statement given by the test authorities
    ASTM and BS EN 20354 (previously BS3638 : 1963) are both standard tests for measuring absorption co-efficients. ASTM C384 is a laboratory scale test measuring normal incidence co-efficients. Both methods give an indication of the potential performance of the material under the test. Whilst the latter reverberation room method may prove more relevant in most practical situations, neither test can predict overall performance in a real application.    
   
  1. The acoustic frame with 10 mm dense foam on one or both sides, this material has BS EN 20354 co-efficient of 0.12 at 500 Hz (the frequency of a human voice). The screen is upholstered in Camira Cara fabric over the foam.


  2. The acoustic frame with 7 mm base foam and 36 mm rise pyramid foam material with a BS EN 20354 co-efficient of 0.42 at 500Hz (the frequency of a human voice). The screen is upholstered in Camira Cara fabric on one side and has the black pyramid foam visible on the opposite side.


  3. The acoustic frame with 57 mm base foam and 36 mm rise pyramid foam material with a BS EN 20354 co-efficient 0.82 at 500Hz (the frequency of a human voice). The screen is upholstered in Camira Cara fabric on one side and has the black pyramid foam visible on the opposite side.


  4. The acoustic frame with a sandwich of 6 mm dense foam/lead/foam on one or both sides, we do not have figures for this material but it is more effective than the 10 mm foam on high frequency (office equipment). The screen is upholstered in Camira Cara fabric over the foam/ lead/foam.