PTB – Physikalisch-Technische Bundesanstalt

Micro-perforated glass panels

Micro-perforated acrylic glass sound absorber

Microporous two-layer foil roller blind, 5 cm cavity

Microporous single-layer foil roller blind, 5 cm air cavity

Mineral or glass wool blanket, covered with open weave fabric

Mineral or glass wool blanket covered with 10% perforated or 20% slotted hardboard

Mineral spray-on materials, 1.27 cm mineral fiber

Mineral spray-on materials, 1.27 cm mineral fiber on metal lath, 2.54 cm airspace

Mineral spray-on materials, 2.5 cm mineral fiber

Mineral fiber honeycomb structure, non-woven faced, white sprayed (DNA 1968, a7-3)

Mineral fiber honeycomb structure, non-woven faced, white spray-painted (DNA 1968, a7-5)

Mineral fiber panel 20 Rayl/cm, 50 mm thick, 50 mm wall distance, plywood facing

Mineral fiber panel, bonded, sprayed surface

Mineral fiber panel, surface-treated on both sides, 20 mm, spacing 50 mm

Mineral fiber panel, bonded, surface-treated, 50 mm, 120 Rayl/cm, no spacing

Mineral fiber panel, sprayed, on sub-frame

Mineral fiber panel, resin-bonded, thickness 10 mm

Mineral fiber panel, resin-bonded, thickness 20 mm

Mineral fiber panel, resin-bonded, 30 mm, thickness 30 mm

Mineral fiber panel, resin-bonded, 50 mm, 40 kg/m³, 1.98 kg/m², 12.7 kPa·s/m², thickness 50 mm

Minerval panels wave

Mineral carrier panels with coating

Mineral spray-on materials, 1.9 cm mineral fiber

Mineral shot panel with porous hard foil

50 mm mineral wool (40 kg/m³), glued to wall, surface sprayed with thin plastic solution

50 mm mineral wool (40 kg/m3), glued to wall, untreated surface

50 mm mineral wool (70 kg/m³) 300 mm in front of wall

Minerval panels travertine

Minerval panels loga

Minerval panels sky

Medium upholstered chair, unoccupied, front side of seat back 2.5 cm, average

α per m² audience area

Medium upholstered chair, unoccupied, seat back 2.5 cm, seat bottom 5 cm, Boston Symphony Hall

α per m² audience area

Medium upholstered chair, occupied (Buffalo, Kleinhans Hall)

α per m² audience area

Medium upholstered chair, unoccupied, Bristol, Colston Hall

α per m² audience area

Medium upholstered chair, unoccupied (series 2)

α per m² audience area

Medium upholstered chair, unoccupied, 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 (series 3)

α per m² audience area

Medium upholstered chair, unoccupied, 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 (series 4)

α per m² audience area

Medium upholstered chair, unoccupied, 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 (series 5)

α per m² audience area

Medium upholstered chair, unoccupied, front side of seat back 2.5 cm, rear side of seat back 0, top of seat bottom 5 cm, arm rests solid, Buffalo, Kleinhans Hall (series 6)

α per m² audience area

Medium upholstered chair, unoccupied, 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 (series 7)

α per m² audience area

Medium upholstered chair, unoccupied, 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

Moquette floor (C)

Moquette tapestry (C) max

moquette tapestry (C) min (series 2)

Mouvceiling

n'H Akustik + Design Topakustik 12/4 HR wood absorber

n'H Akustik Topakustik 4/4 M fiber absorber

n'H Akustik Topperfo perforated panel with fiber absorber