Plaster & sprayHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: Manufacturer data unter http://asonad.de, March 2002

Value from the PTB table, not verified

Asona Sonaspray K-13 acoustic spray coating

Sonaspray K-13

PTB reference data

Original description

Material properties

Manufacturer: Asona Deutschland GmbH

Thickness: 0.6 in, 0.7 in, 1 in, 1.3 in, 1.5 in, 1.7 in, 2 in, 2.2 in, 2.5 in, 2.8 in, 3 in

Reverberation chamber (ASTM C423 / ISO 354)· 11 variants

NRC

0.95

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.40	0.75	1.00	1.00	0.95	0.95

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NRC: 0.95 (derived from ISO 354 lab data)

Measured values as a table (11 measurements)

Asona Sonaspray K-13 acoustic spray coating: 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
16 mm	0.55	0.05	0.16	0.44	0.79	0.90	0.91
19 mm	0.65	0.06	0.19	0.55	0.89	0.91	0.93
25 mm	0.75	0.08	0.29	0.75	0.98	0.93	0.96
32 mm	0.80	0.12	0.40	0.85	1.02	0.96	0.96
38 mm	0.90	0.18	0.50	0.95	1.06	1.00	0.97
44 mm	0.95	0.19	0.60	1.05	1.11	1.03	0.98
50 mm	0.95	0.29	0.67	1.04	1.06	1.00	0.97
57 mm	0.95	0.39	0.74	1.03	1.02	0.96	0.95
63 mm	0.95	0.50	0.81	1.02	0.98	0.92	0.93
70 mm	0.90	0.60	0.88	1.01	0.90	0.88	0.92
76 mm	0.90	0.70	0.95	1.00	0.85	0.85	0.90

Measured values as a table (11 measurements)

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Last updated: 09/11/2026