PTB – Physikalisch-Technische Bundesanstalt

TI-Metal ceiling facing with 30 mm mineral wool

Topakustik 12/4 M wood panel with mineral wool absorber

Topakustik 13/3 M slotted wood panel with mineral wool

Topakustik 28/4 M grooved and perforated fiber absorber

Topakustik 5/3 M grooved wood panel with mineral wool

Topakustik 5/3 T fiber absorber, grooved and perforated

Topakustik Fineline wood fiber absorber with mineral wool

Topperfo 16/16/6 perforated panel with mineral wool absorber

Topperfo 16/16/8 perforated panel with mineral wool

tournelements

Transite, 3/16 inch perforated, cement-asbestos board, 11% open area, mounted over 4 inch air space

Transite, 3/16 inch perforated, cement-asbestos board, 11% open area

Transite, 3/16 inch perforated, cement-asbestos board, 11% open area, paper backed board, mounted over 4 inch air space

Partition 8x25x25 cm, 10 holes, perforation ratio 60%, whitewashed

Partition 8x25x25 cm, 10 holes, F/A=60% with whitewash

partition cm 8x25x25 10 holes F/A=60% without whitewash 1 day

stairs

Polyether urethane foam, A1 polyester surface

Polyether urethane foam, reinforced polyester surface

Tufcote Type E-100CM polyether urethane foam, 1 mil clear polyester surface

Tufcote Type E-100SF polyether urethane foam, textured surface

9 mm tufted pile carpet on felt underlay

Fiberglass blanket with flexible internal septum

unoccupied plastic chairs

α per m² audience area

Chairs, unoccupied average cloth-covered well upholstered areas (perforated bottoms)

α per m² audience area

Chairs, unoccupied moderately upholstered chairs (0.90 m x 0.55 m)

α per m² audience area

Heavily upholstered chair, unoccupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, N.Y., Philharmonic Hall

α per m² audience area

Seating, unoccupied, fabric-covered, padded, perforated seat undersides

α per m² audience area

Unperforated gypsum board with 5 cm air cavity

Unperforated metal panel ceiling with Sillan acoustic panels

Unitecta Orion ceiling tile with laminated textured surface

Unpainted brick wall (C/g)

USG Acoustone Chex/16 foil-backed panels

Acoustone "F" fissured, foil-backed tiles and panels

Fissured tiles and panels, fire-resistant

Fissured acoustical tile

USG Interiors Auratone fissured acoustic panels

Fissured, fire-rated acoustical tiles and panels

USG Interiors fissured ceiling tile "F"

Rough textured tiles and panels

USG Interiors Nubby fiberglass lay-in panels

USG Interiors Orion ceiling tile

USG Interiors Trocal rigid PVC panel with fiber absorber

Velour fabric, light (10 oz), hung straight touching wall

Velour fabric, medium (14 oz), draped to half area

sealed up glass 6.4 mm

VIC "Acoustic Plastic" thickness= 20 mm (G.F.)

VIC "Acoustic Plastic" thickness 12 mm (G.F.)