pinta acoustic EXPANDEDLINE MEDIUM expanded metal raft (series 2)

EXPANDEDLINE – MEDIUM

PTB reference data

Original description

Material properties

Manufacturer: pinta acoustic gmbh

Thickness: 0.1 in

Wall distance: 3.9 in, 7.9 in, 12 in, 20 in

Backing: glass cellulose non-woven

Surface: galvanized

Mounting: with distance to wall

Reverberation chamber (ASTM C423 / ISO 354)· 4 variants

NRC

0.35

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.15	0.20	0.40	0.40	0.35	0.40

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NRC: 0.35 (derived from ISO 354 lab data)

Weight / density: 4,4 - 4,8 kg/m²

Dimensions: variabel

Measured values as a table (4 measurements)

pinta acoustic EXPANDEDLINE MEDIUM expanded metal raft (series 2): 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
1,5 mm · 4,4 - 4,8 kg/m² · 100 mm	0.25	0.05	0.05	0.15	0.40	0.35	0.35
1,5 mm · 4,4 - 4,8 kg/m² · 200 mm	0.30	0.10	0.15	0.25	0.40	0.35	0.35
1,5 mm · 4,4 - 4,8 kg/m² · 300 mm	0.30	0.10	0.15	0.25	0.40	0.35	0.40
1,5 mm · 4,4 - 4,8 kg/m² · 500 mm	0.35	0.15	0.20	0.40	0.40	0.35	0.40

Measured values as a table (4 measurements)

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Last updated: 09/15/2026