Mineral woolHighly absorbent

Data source

PTB reference data

Physikalisch-Technische Bundesanstalt

Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994

Fiberglass duct liner with surface coating

Ultralite

PTB reference data

Original description

Fiberglass duct liner with surface coating

Material properties

Manufacturer: CertainTeed Corp.

Thickness: 25.4 mm, 38.1 mm, 50.8 mm

Wall distance: 0 mm, 25 mm

Surface: with surface coating

Measurement data

Sound absorption

ISO 354 – reverberation chamber· 18 variants

αw

0.83

Frequency values

αp per ISO 11654

f (Hz)	125	250	500	1k	2k	4k
αp	0.35	0.80	0.95	1.00	0.95	0.95

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Compare				Value
	2 inches	0.5 lb/ft²	25 mm	αw0.83
	2 inches	0.34 lb/ft²	25 mm	αw0.82
	2 inches	0.50 lb/ft²	0	αw0.82
	2 inches	0.24 lb/ft²	25 mm	αw0.79
	2 inches	0.34 lb/ft²	0	αw0.76
	1 1/2 inch	0.37 lb/ft²	25 mm	αw0.75
	1 1/2 inch	0.25 lb/ft²	25 mm	αw0.74
	2 inches	0.24 lb/ft²	0	αw0.71
	1 1/2 inch	0.37 lb/ft²	0	αw0.71
	1 1/2 inch	0.18 lb/ft²	25 mm	αw0.70
	1 1/2 inch	0.25 lb/ft²	0	αw0.69
	1 1/2 inch	0.18 lb/ft²	0	αw0.66
	1 inch	0.25 lb/ft²	25 mm	αw0.65
	1 inch	0.17 lb/ft²	25 mm	αw0.62
	1 inch	0.12 lb/ft²	25 mm	αw0.61
	1 inch	0.25 lb/ft²	0	αw0.57
	1 inch	0.17 lb/ft²	0	αw0.56
	1 inch	0.12 lb/ft²	0	αw0.54

Dimensions: roll