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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 · Plastic & filmαw0.25
Unperforated sheet with 45 mm insulation on ground
PTB · Foamαw0.25
Barynal 15 F 20 porous foam absorber
PTB · Mineral woolαw0.60–0.85
Basalan acoustic and climate insulation panel BPG-50S
PTB · Mineral woolαw0.65–0.90
Basalan BPG-H/S mineral fiber acoustic and climate insulation panel
PTB · Mineral woolαw0.65–0.95
Basalan BPO-HT 140 high-temperature insulation board
PTB · Stone & concreteαw0.20
Basalt lava panel
PTB · Plaster & sprayαw0.65–0.70
BASWA-phon System P, mineral plaster on mineral wool
PTB · Fabricαw0.75
Cotton plush (chenille), gathered
PTB · Fabricαw0.85
Cotton plush "Malta", folded and gathered
PTB · Fabricαw0.75
Cotton plush "Malta", hanging, double-ruffled
PTB · Reference surfaceαw0.55
Cotton carpet (g)
PTB · Fabricαw0.25
Curtains, cotton cloth (0.33 kg/m²) folded to 3/4 area
PTB · Fabricαw0.55
Curtains, cotton cloth (0.33 kg/m²) draped to half area (CATT: COTTON1)
PTB · Fabricαw0.25
Curtains, cotton cloth (0.33 kg/m²) folded to 7/8 area (CATT: COTTON3)
PTB · Fabricαw0.20
Cotton curtains (0.5 kg/m²) draped to 3/4 area approx. 130 mm from wall
PTB · Reference surfaceαw0.10
Painted CLS blocks
PTB · Reference: audienceαw0.80
occupied plastic chairs
α per m² audience area
PTB · Reference: audienceαw0.80
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, Seattle, Opera House
α per m² audience area
PTB · Reference: audienceαw0.85
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, N.Y., Avery Fisher Hall
α per m² audience area
PTB · Reference: audienceαw0.80
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, Boston, Symphony Hall
α per m² audience area
PTB · Reference: audienceαw0.80
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, Bristol, Colston Hall
α per m² audience area
PTB · Reference: audienceαw0.85
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, Liverpool, Philharmonic Hall
α per m² audience area
PTB · Reference: audienceαw0.85
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, average
α per m² audience area
PTB · Reference: audienceαw0.80
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, Tokyo, Hamarikyu Asahi Hall
α per m² audience area
PTB · Reference: audienceαw0.85
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, Stuttgart, Liederhalle
α per m² audience area
PTB · Reference: audienceαw0.85
Medium upholstered chair, occupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, average from smoothed curve
α per m² audience area
PTB · Reference: audienceαw0.75
Specially upholstered chair, occupied, front side of seat back 65%, 2 cm, rear side of seat back 0, top of seat bottom 4-6 cm, arm rests solid, upholstery cushion is covered with a vinyl sheet red...
α per m² audience area
PTB · Reference: audienceαw0.65
Occupied seating, average values for churches, 1.5 persons/m²
α per m² audience area
PTB · Reference: audienceαw0.70
Occupied pews (churches), 2 persons/m²
α per m² audience area
PTB · Reference: audienceαw0.45
Occupied seating, average values for churches, 0.7 pers./m²
α per m² audience area
PTB · Reference surfaceαw0.35
Concrete block, coarse
PTB · Reference surfaceαw0.10
Concrete block, painted
PTB · Reference surfaceαw0.05
Concrete block, plastered
PTB · Reference surfaceαw—
Floors, concrete floor (CATT: CONCRETE30)
PTB · Reference surfaceαw0.05
Concrete floor (g) (RAMSETE)
PTB · Reference surfaceαw0.05
Concrete floor, wood boards, 19 inch, secured to it
PTB · Reference surfaceαw0.05
Concrete floor, linoleum cemented to it
PTB · Reference surfaceαw—
Walls, concrete wall, rough finish
PTB · Plaster & sprayαw0.35
Spray-on, medium structure material
PTB · Reference surfaceαw0.15
Roofing felt, bituminous, two layers, 0.8 lb/ft², mounted over 10 inch air space
PTB · Stone & concreteαw0.30
expanded clay blocks
PTB · Reference surfaceαw0.10
Leaded glass
PTB · Reference surfaceαw0.05
floors
PTB · Reference: audienceαw0.30
Floor with cloth-upholstered seats
α per m² audience area
PTB · Reference surfaceαw—
Floors, concrete or terrazzo
PTB · Reference surfaceαw0.05
Floors, tiles on concrete
PTB · Reference surfaceαw0.70
Floors, gravel, 100 mm thickness
PTB · Reference surfaceαw0.10