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PTB – Physikalisch-Technische Bundesanstalt
Reference data from the PTB database for sound absorption coefficients. These data provide a planning baseline and come from standardised measurements.
1,746 products
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PTB · WoodNRC0.35
Cement-bonded wood wool lightweight panel, 500 x 2000 mm, 35 mm (DNA 1968, a3.1-2)
PTB · WoodNRC0.50
Cement-bonded wood wool lightweight panel (DNA 1968, a3.1-3)
PTB · WoodNRC0.50
Cement-bonded wood wool lightweight board, 50 mm thick, 30 mm air cavity (DNA 1968, a3.1-4)
PTB · Reference surfaceNRC0.05
Brick, unglazed
PTB · Reference surfaceNRC—
Brick, unglazed, painted
PTB · Reference surfaceNRC0.05
brick wall (B)
PTB · Stone & concreteNRC0.80
Walls, bricks with 19 holes (facing out), 50 mm from hard wall with mineral wool
PTB · Stone & concreteNRC0.50
Brick wall with 78 holes, 50 mm mineral wool backing
PTB · Reference surfaceNRC0.45
Walls, bricks with 78 holes (facing out) directly on stonewall
PTB · Reference surfaceNRC—
painted brick wall (C/g)
PTB · Reference surfaceNRC0.05
Brick wall with a smooth troweled finish
PTB · Reference surfaceNRC0.05
2 heads wall - half full brick UNI 12x25x5.5 cm F/A=32% + whitewash
PTB · Reference surfaceNRC—
Walls, brickwall, lime cast, coated with oil paint
PTB · Reference surfaceNRC0.05
Brick wall, stuccoed with a rough finish
PTB · Reference surfaceNRC0.05
3 heads wall - full brick UNI cm 12x25x5.5 F/A = 15% + whitewash
PTB · Plaster & sprayNRC0.65–0.75
Acoustical plaster (Zonolite)
PTB · Reference: audienceNRC0.65
Audience, medium upholstered seats, unoccupied
α per m² audience area
PTB · Reference surfaceNRC0.05