Rockwool blanket, 2 inch thick batt (Semi-Thik), covered with 3/16 inch thick perforated cement asbestos board (Transite), 11% open area, mounted over 2 inch air space – PTB – Physikalisch-Technische Bundesanstalt | Acoustic Index

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Mineral woolLow-frequency absorber

Data source

PTB reference data

Physikalisch-Technische Bundesanstalt

Source: Sound System Engineering, Don Davis and Carolyn Davis

Rockwool blanket, 2 inch thick batt (Semi-Thik), covered with 3/16 inch thick perforated cement asbestos board (Transite), 11% open area, mounted over 2 inch air space

PTB reference data

Original description

Material properties

Thickness: 3/16 inch (Transite), 2 inch (Rockwool)

Wall distance: 2 inch

Perforation: 11%

Backing: 2 inch Rockwool blanket

Surface: perforated cement asbestos board (Transite)

Measurement data

Sound absorption

ISO 354 – reverberation chamber

αw

0.67

Frequency values

αp nach ISO 11654

125 Hz

0.40

250 Hz

0.65

500 Hz

1.00

1000 Hz

0.90

2000 Hz

0.60

4000 Hz

0.50

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Method (354): Measured

Acoustic Index

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