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Laboratorie ljuddämpning grad enlig DIN EN ISO 140-4 (1995)
fabric type Sonatex 10 dB: rated sound protection degree: R´w(C,Ctr) = 12(0,2) dB rated standard-sound gage difference: Dntw (Ctr) = 22(-1,-2) dB fabric type Sonatex 15 dB: rated sound protection degree: R´w(C,Ctr) = 17(0,2) dB rated standard-sound gage difference: Dntw (Ctr) = 28(-1,-2) dB
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