Reference surfaceLow absorption

Physikalisch-Technische Bundesanstalt

Source: Harris:Handbook of Acoustical Measurements and Noise Control, McGraw Hill 1991

Value from the PTB table, not verified

Plaster, gypsum, or lime, smooth finish on tile or brick

PTB reference data

Original description

Material properties

Surface: smooth finish on tile or brick

Reverberation chamber (ASTM C423 / ISO 354)

NRC

0.05

derived from ISO 354 lab data

α_p nach ISO 11654

f (Hz)	125	250	500	1k	2k	4k
α_p	0.00	0.00	0.00	0.05	0.05	0.05

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Value from the PTB table, not verified

NRC: 0.05 (derived from ISO 354 lab data)

Measured values as a table (1 measurement)

Plaster, gypsum, or lime, smooth finish on tile or brick: 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
on tile or brick · smooth finish	0.05	0.01	0.02	0.02	0.03	0.04	0.05

Measured values as a table (1 measurement)

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Last updated: 09/04/2026