Name: Silicate-treated wood fiber, organic binder
Creator: Physikalisch-Technische Bundesanstalt (PTB)
License: https://acousticindex.com/en-us/terms-of-use

Measured values as a table (12 measurements)

Silicate-treated wood fiber, organic binder: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz
1 inch · 1.6 lb/ft² · 0	0.40	0.06	0.13	0.24	0.45	0.82	0.64
1 inch · 1.6 lb/ft² · nailed to 20 mm wood furring strips	0.45	0.07	0.15	0.36	0.65	0.71	0.81
1 inch · 1.6 lb/ft² · covered with perforated facing, airspace 20 mm	0.80	0.16	0.43	1.00	1.05	0.79	0.98
1 inch · 1.6 lb/ft² · covered with perforated facing, airspace 40 mm	0.85	0.32	0.70	1.09	0.93	0.76	0.94
1 1/2 inch · 2.5 lb/ft² · 0	0.55	0.07	0.22	0.48	0.82	0.64	0.96
1 1/2 inch · 2.5 lb/ft² · nailed to 20 mm wood furring strips	0.60	0.15	0.26	0.62	0.83	0.70	0.91
1 1/2 inch · 2.5 lb/ft² · covered with perforated facing, airspace 20 mm	0.90	0.24	0.57	1.17	0.87	0.93	0.87
1 1/2 inch · 2.5 lb/ft² · covered with perforated facing, airspace 40 mm	0.95	0.40	0.84	1.18	0.84	0.94	0.88
2 inch · 3.3 lb/ft² · 0	0.60	0.15	0.26	0.62	0.94	0.64	0.92
2 inch · 3.3 lb/ft² · nailed to 20 mm wood furring strips	0.70	0.15	0.36	0.74	0.82	0.82	0.92
2 inch · 3.3 lb/ft² · covered with perforated facing, airspace 20 mm	0.95	0.24	0.67	1.14	0.87	1.06	0.96
2 inch · 3.3 lb/ft² · covered with perforated facing, airspace 40 mm	1.00	0.42	0.89	1.19	0.85	1.08	0.94

Data source

PTB reference data

Silicate-treated wood fiber, organic binder

Material properties

Measurement data

Sound absorption

Frequency values

			Value
1 1/2 inch	2.5 lb/ft²	covered with perforated facing, airspace 1.6 in	NRC0.95
2 inch	3.3 lb/ft²	covered with perforated facing, airspace 1.6 in	NRC1.00
2 inch	3.3 lb/ft²	covered with perforated facing, airspace 0.8 in	NRC0.95
1 inch	1.6 lb/ft²	covered with perforated facing, airspace 1.6 in	NRC0.85
1 1/2 inch	2.5 lb/ft²	covered with perforated facing, airspace 0.8 in	NRC0.90
1 inch	1.6 lb/ft²	covered with perforated facing, airspace 0.8 in	NRC0.80
2 inch	3.3 lb/ft²	nailed to 0.8 in wood furring strips	NRC0.70
1 1/2 inch	2.5 lb/ft²	nailed to 0.8 in wood furring strips	NRC0.60
2 inch	3.3 lb/ft²	0	NRC0.60
1 1/2 inch	2.5 lb/ft²	0	NRC0.55
1 inch	1.6 lb/ft²	nailed to 0.8 in wood furring strips	NRC0.45
1 inch	1.6 lb/ft²	0	NRC0.40