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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
Page 30 of 37
PTB · Mineral woolαw0.65–0.85
Rockwool RAF-SE sound-absorbing mineral fiber panel
PTB · Mineral woolαw0.50
Rockwool blanket, 4 inch thick batt (Full-Thik), with 3/16 inch Transite facing
PTB · Reference surfaceαw0.30
Pipe system (Condensation)
PTB · Stone & concreteαw0.35
RPG Diffusor Systems Diffusorblox, painted concrete masonry unit
PTB · Mineral woolαw1.00
Saint-Gobain Isover G+H light channel ceiling, mineral fiber
PTB · Woodαw0.35
Saint-Gobain Isover wood panel ceiling with mineral fiber
PTB · Fabricαw0.45
velvet curtains at 20 cm (C/B)
PTB · Reference surfaceαw0.50
Floors, sand, 100 mm thickness
PTB · Fabricαw0.85
Satin drapes, gathered
PTB · Fabricαw0.85
Satin curtain 82 Rayl, 20 cm from wall, 1.5x gathered
PTB · Plaster & sprayαw0.50
Sound-absorbing plaster, 20 mm thickness
PTB · Foamαw0.40
Foam hanging element with non-woven cover
PTB · Foamαw0.90
Foam panel, waffle structure, no air cavity
PTB · Plaster & sprayαw0.40
Scherff acoustic plaster, thickness approx. 20 mm, non-combustible A1
PTB · Plaster & sprayαw0.40
Scherff acoustic plaster, flattened surface, approx. 10 mm
PTB · Plaster & sprayαw0.60
Scherff acoustic plaster, non-combustible
PTB · Plaster & sprayαw0.35
Scherff acoustic plaster, non-combustible A1
PTB · Feltαw0.55–0.90
Scherff Idikell Type B 202 fiber absorber
PTB · Reference surfaceαw—
Layer of rubber, cork, linoleum+underlay or vinyl+underlay stuck to concrete
PTB · Reference surfaceαw0.55
Loop pile tufted carpet on hair pad, 1.4 kg/m², 9.5 mm pile height
PTB · Reference surfaceαw0.25
Carpet: Loop pile tufted carpet, 0.7 kg/m²: no pad
PTB · Reference surfaceαw0.70
Carpet: Loop pile tufted carpet, 1.4 kg/m², 9.5 mm pile height: On hair and jute pad, 3.0 kg/m²
PTB · Reference surfaceαw0.65
Loop pile tufted carpet on hair pad
PTB · Reference surfaceαw0.40
Carpet: Loop pile tufted carpet, 0.7 kg/m²: With 1.4 kg/m² hair pad
PTB · Reference surfaceαw0.05
Quick limewash (T.R.)
PTB · Reference surfaceαw0.75
Ballast or other crushed stone, 3.18 cm, 45.7 cm deep
PTB · Reference surfaceαw0.55
Ballast or other crushed stone, 3.18 cm, 30.5 cm deep
PTB · Reference surfaceαw0.80
Ballast or other crushed stone, 0.64 or less granite aggregate 15.2 deep
PTB · Reference surfaceαw0.45
Ballast or other crushed stone, 3.18 cm screened ballast 15.2 cm deep
PTB · Reference surfaceαw0.05
Heavy large glass sheet (g)
PTB · Fabricαw0.30
Heavy pleated curtains
PTB · Reference surfaceαw0.25
Carpet heavy, on concrete
PTB · Reference surfaceαw0.40
Carpet heavy, with impermeable latex backing on hairfelt or foam rubber
PTB · Reference surfaceαw0.25
Floors, carpet, heavy, cemented to concrete
PTB · Fabricαw0.60
Drapes, heavy velour
PTB · Fabricαw0.60
Velour fabric, heavy (18 oz), draped to half area
PTB · Reference surfaceαw0.50
Scotch
PTB · Reference surfaceαw0.30
rope carpet (g)
PTB · Reference surfaceαw0.05
Side reflector
PTB · Feltαw0.90
Suspended acoustical panels
PTB · Feltαw0.55–0.85
Siegfried Keller Idikell fiber absorber Type B 208
PTB · Foamαw0.30
Siegfried Keller Idikell M 3817/28 PU foam absorber with PVC foil
PTB · Feltαw0.40–0.50
Siegfried Keller Idikell M textile fiber absorber
PTB · Feltαw0.70
Acoustical panels (Siegfried Keller Pyramid panel)
PTB · Woodαw0.70
Siegfried Keller Siesta slotted panel with mineral fiber
PTB · Reference surfaceαw0.10
Silflex rubber 3.5 kg/m² (MATIS)
PTB · Foamαw0.50
SINOtec OPTACust Skinplan OCP-SKINP-40 flexible foam
PTB · Foamαw0.45–0.55