Stone & concreteHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: Manufacturer's product sheet

Value from the PTB table, not verified

pinta acoustic phonestop expanded glass granulate ceiling raft

phonestop

PTB reference data

Original description

Material properties

Manufacturer: pinta acoustic gmbh

Thickness: 1 in

Wall distance: 3.9 in, 12 in, 7.9 in

Application: ceiling raft

Reverberation chamber (ASTM C423 / ISO 354)· 3 variants

NRC

0.70

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.20	0.40	0.70	0.75	0.95	1.00

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NRC: 0.70 (derived from ISO 354 lab data)

Weight / density: 270 kg/m³ ± 10%

Dimensions: 618 x 24 in

Measured values as a table (3 measurements)

pinta acoustic phonestop expanded glass granulate ceiling raft: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	100 Hz	125 Hz	160 Hz	200 Hz	250 Hz	315 Hz	400 Hz	500 Hz	630 Hz	800 Hz	1000 Hz	1250 Hz	1600 Hz	2000 Hz	2500 Hz	3150 Hz	4000 Hz	5000 Hz
25 mm · 270 kg/m³ ± 10% · 100 mm	0.70	0.10	0.04	0.15	0.21	0.33	0.47	0.59	0.82	0.86	0.83	0.77	0.77	0.87	0.96	0.98	0.97	0.96	0.98
25 mm · 270 kg/m³ ± 10% · 300 mm	0.70	0.13	0.21	0.18	0.34	0.48	0.54	0.59	0.57	0.59	0.73	0.78	0.86	0.90	1.03	1.07	1.10	1.09	1.14
25 mm · 270 kg/m³ ± 10% · 200 mm	0.70	0.16	0.13	0.25	0.30	0.42	0.52	0.61	0.72	0.70	0.64	0.72	0.86	0.90	0.97	1.02	1.07	1.04	1.08

Measured values as a table (3 measurements)

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Last updated: 09/04/2026