Mineral woolHighly absorbent

Physikalisch-Technische Bundesanstalt

Source: H. Lenz, Marktübersicht schallabsorbierende Anordnungen, Ruhr Universität Bochum, 1981, Seite 75

Value from the PTB table, not verified

Armstrong Celtic perforated mineral fiber acoustic panel, 15 mm

Celtic perforated

PTB reference data

Original description

Material properties

Manufacturer: Armstrong Cork International GmbH

Thickness: 0.6 in

Wall distance: 20 in

Dimensions: 300 × 12 in, 600 × 24 in, 625 × 25 in

Surface weight: 4.7 kg/m²

Surface: three-layer PVAC-based paint coating

Reverberation chamber (ASTM C423 / ISO 354)· 2 variants

NRC

0.60

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.35	0.40	0.65	0.70	0.60	0.55

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Compare	Value
	NRC0.60
	NRC0.20

NRC: 0.60 (derived from ISO 354 lab data)

Weight / density: 4,7 kg / m²

Dimensions: 300 x 300, 600 x 600, 625 x 625, 600 x 1200 and 625 x 49 in

Distance: 20 in

Measured values as a table (2 measurements)

Armstrong Celtic perforated mineral fiber acoustic panel, 15 mm: 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	6300 Hz
15 mm · 4,7 kg / m² · 500 mm	0.60	0.30	0.37	0.35	0.37	0.40	0.42	0.58	0.65	0.72	0.73	0.72	0.70	0.65	0.60	0.57	0.55	0.53	0.53	0.53
15 mm · 4,7 kg / m² · 500 mm	0.20	0.25	0.30	0.23	0.23	0.20	0.20	0.20	0.18	0.18	0.18	0.20	0.20	0.25	0.28	0.30	0.30	0.27	0.25	0.25

Measured values as a table (2 measurements)

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Last updated: 09/02/2026