Back to database
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
Page 35 of 37
PTB · Plastic & filmαw0.60
VIC "Acoustic Plastic", thickness 20 mm (Kundt's tube) (series 2)
PTB · Plastic & filmαw0.45
Trimline panel, perforated vinyl wall covering
PTB · Fabricαw0.40
Vicracoustic Trimline panel, polyester covering
PTB · Fabricαw0.55
Drapes: Medium velour 475 g/m², draped to half area
PTB · Fabricαw0.60
Drapes: Heavy velour 610 g/m² draped to half area
PTB · Fabricαw0.20
Curtains (0.2 kg/m²) hung 90 mm from wall
PTB · Fabricαw0.15
Curtains of close-woven glass mat hung 50 mm from wall
PTB · Fabricαw0.55
Drapes, medium velour, draped to half area
PTB · Fabricαw0.70
Curtain fabric, 25 cm from wall
PTB · Fabricαw0.35
Curtain fabric, single, free-hanging
PTB · Mineral woolαw0.40
Honeycomb construction made of mineral fiber panels
PTB · Reference surfaceαw0.10
wax-cork floor (C)
PTB · Reference surfaceαw0.05
wall 25 cm. rif 173
PTB · Otherαw0.70
Wall 25 cm + circular screens
PTB · Reference surfaceαw—
Walls, marble, glazed tiles
PTB · Reference surfaceαw0.05
wall in raw CLS (C/B)
PTB · Reference surfaceαw0.10
Walls, 9 mm plaster on 25 mm studs (no mineral wool)
PTB · Reference surfaceαw0.05
Walls, 9 mm plaster on 25 mm studs (with mineral wool)
PTB · Woodαw0.15
Walls, 3 mm wood veneer on 50 mm studs
PTB · Woodαw0.50
Walls, 100 mm "Soundboard" (pressed wood curls with air gaps)
PTB · Reference surfaceαw0.05
Walls, 13 mm plaster on 100 mm studs
PTB · Reference surfaceαw0.10
Walls, 13 mm plaster on 25 mm studs (with mineral wool)
PTB · Reference surfaceαw0.85
Wall 25 cm rif173 + 5 cm bonded
PTB · Reference surfaceαw0.05
Walls, 30 mm plaster on metal lath
PTB · Foamαw0.75
Walls, acoustic foam panel
PTB · Gypsumαw0.50
Walls, slotted 13 mm gypsum board (12%), 106 x 3 mm² on studs and mineral wool
PTB · Reference surfaceαw0.30
Walls, just a sample
PTB · Woodαw0.25
Walls, 30 mm "Soundboard" (pressed wood curls with air gaps)
PTB · Reference surfaceαw0.80
Walls, abs80 diff99 (CATT: ABS80_99)
PTB · Reference surfaceαw0.15
walls (RAMSETE)
PTB · Reference surfaceαw—
Walls in reverberation chamber
PTB · Plastic & filmαw0.85
Walls, 50 mm thick, directly against wall, with 0.05 mm PE foil
PTB · Woodαw0.35
Walls, 50 mm "Soundboard" (pressed wood curls with air gaps)
PTB · Woodαw0.45
Walls, 70 mm "Soundboard" (pressed wood curls with air gaps)
PTB · Reference surfaceαw0.05
Walls, concrete block, with or without plaster, painted
PTB · Reference surfaceαw0.10
Walls, board on joist floor
PTB · Reference surfaceαw0.10
Walls, average total residual absorption of 15 halls
PTB · Mineral woolαw0.60
Walls, fiber against rigid backing
PTB · Reference surfaceαw0.05
Walls, hard surfaces average (brick walls, plaster, hard floors etc.)
PTB · Reference surfaceαw0.05
Walls, slightly vibrating walls (suspended ceilings etc.)
PTB · Reference surfaceαw—
Walls, rafts in reverberation chamber
PTB · Woodαw0.15
Walls, plywood on battens fixed to solid backing
PTB · Reference surfaceαw0.05
Walls, plastered brickwork, plastered
PTB · Reference surfaceαw0.05
Walls, rendered brickwork, rendered
PTB · Reference surfaceαw0.05
Walls, brickwall, casted, with tapestry
PTB · Otherαw0.10
Walls, panel with slot 1 mm, on 25 mm studs with mineral wool
PTB · Otherαw0.70
Walls, panel with slot 102 mm, on 25 mm studs with mineral wool
PTB · Otherαw0.15