GypsumHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 140

Value from the PTB table, not verified

Isover Acoustic Panel XAN gypsum cassette ceiling

Gypsum cassette ceiling – Akustikplatte XAN

PTB reference data

Original description

Material properties

Manufacturer: Saint-Gobain Isover G+H AG

Thickness: 1.2 in

Wall distance: 3.1 in, 6.7 in, 14 in

Perforation: 15.9%

Backing: Isover mineral fiber

Application: gypsum cassette ceiling

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

NRC

0.75

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.65	0.90	0.70	0.80	0.75	0.55

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NRC: 0.75 (derived from ISO 354 lab data)

Weight / density: ca. 15 - 25 kg / m²

Dimensions: 625 x25 in

Measured values as a table (3 measurements)

Isover Acoustic Panel XAN gypsum cassette ceiling: 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
30mm · ca. 15 - 25 kg / m² · 80 mm	0.70	0.10	0.14	0.20	0.27	0.43	0.63	0.85	0.94	0.98	0.93	0.80	0.69	0.64	0.66	0.72	0.57	0.50	0.52
30mm · ca. 15 - 25 kg / m² · 170 mm	0.75	0.40	0.33	0.50	0.60	0.73	0.88	0.93	0.84	0.85	0.78	0.69	0.77	0.74	0.66	0.64	0.50	0.36	0.39
30mm · ca. 15 - 25 kg / m² · 350 mm	0.75	0.51	0.70	0.80	0.95	0.82	0.86	0.80	0.67	0.70	0.78	0.77	0.79	0.78	0.73	0.72	0.59	0.49	0.50

Measured values as a table (3 measurements)

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Last updated: 09/02/2026