Materials Database¶
Absorption Coefficients¶
Massive constructions and hard surfaces¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
hard_surface |
Walls, hard surfaces average (brick walls, plaster, hard floors, etc.) |
0.02 |
0.02 |
0.03 |
0.03 |
0.04 |
0.05 |
0.05 |
brickwork |
Walls, rendered brickwork |
0.01 |
0.02 |
0.02 |
0.03 |
0.03 |
0.04 |
0.04 |
rough_concrete |
Rough concrete |
0.02 |
0.03 |
0.03 |
0.03 |
0.04 |
0.07 |
0.07 |
unpainted_concrete |
Smooth unpainted concrete |
0.01 |
0.01 |
0.02 |
0.02 |
0.02 |
0.05 |
0.05 |
rough_lime_wash |
Rough lime wash |
0.02 |
0.03 |
0.04 |
0.05 |
0.04 |
0.03 |
0.02 |
smooth_brickwork_flush_pointing |
Smooth brickwork with flush pointing, painted |
0.01 |
0.01 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
smooth_brickwork_10mm_pointing |
Smooth brickwork, 10 mm deep pointing, pit sand mortar |
0.08 |
0.09 |
0.12 |
0.16 |
0.22 |
0.24 |
0.24 |
brick_wall_rough |
Brick wall, stuccoed with a rough finish |
0.03 |
0.03 |
0.03 |
0.04 |
0.05 |
0.07 |
0.07 |
ceramic_tiles |
Ceramic tiles with a smooth surface |
0.01 |
0.01 |
0.01 |
0.02 |
0.02 |
0.02 |
0.02 |
limestone_wall |
Limestone walls |
0.02 |
0.02 |
0.03 |
0.04 |
0.05 |
0.05 |
0.05 |
reverb_chamber |
Reverberation chamber walls |
0.01 |
0.01 |
0.01 |
0.02 |
0.02 |
0.04 |
0.04 |
concrete_floor |
Concrete floor |
0.01 |
0.03 |
0.05 |
0.02 |
0.02 |
0.02 |
0.02 |
marble_floor |
Marble floor |
0.01 |
0.01 |
0.01 |
0.02 |
0.02 |
0.02 |
0.02 |
Lightweight constructions and linings¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
plasterboard |
2 * 13 mm plasterboard on steel frame, 50 mm mineral wool in cavity, surface painted |
0.15 |
0.1 |
0.06 |
0.04 |
0.04 |
0.05 |
0.05 |
wooden_lining |
Wooden lining, 12 mm fixed on frame |
0.27 |
0.23 |
0.22 |
0.15 |
0.1 |
0.07 |
0.06 |
Glazing¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
glass_3mm |
Single pane of glass, 3 mm |
0.08 |
0.04 |
0.03 |
0.03 |
0.02 |
0.02 |
0.02 |
glass_window |
Glass window, 0.68 kg/m2 |
0.1 |
0.05 |
0.04 |
0.03 |
0.03 |
0.03 |
0.03 |
lead_glazing |
Lead glazing |
0.3 |
0.2 |
0.14 |
0.1 |
0.05 |
0.05 |
|
double_glazing_30mm |
Double glazing, 2–3 mm glass, > 30 mm gap |
0.15 |
0.05 |
0.03 |
0.03 |
0.02 |
0.02 |
0.02 |
double_glazing_10mm |
Double glazing, 2–3 mm glass, 10 mm gap |
0.1 |
0.07 |
0.05 |
0.03 |
0.02 |
0.02 |
0.02 |
double_glazing_inside |
Double glazing, lead on the inside |
0.15 |
0.3 |
0.18 |
0.1 |
0.05 |
0.05 |
Wood¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
wood_1.6cm |
Wood, 1.6 cm thick, on 4 cm wooden planks |
0.18 |
0.12 |
0.1 |
0.09 |
0.08 |
0.07 |
0.07 |
plywood_thin |
Thin plywood panelling |
0.42 |
0.21 |
0.1 |
0.08 |
0.06 |
0.06 |
|
wood_16mm |
16 mm wood on 40 mm studs |
0.18 |
0.12 |
0.1 |
0.09 |
0.08 |
0.07 |
0.07 |
audience_floor |
Audience floor, 2 layers, 33 mm on sleepers over concrete |
0.09 |
0.06 |
0.05 |
0.05 |
0.05 |
0.04 |
|
stage_floor |
Wood, stage floor, 2 layers, 27 mm over airspace |
0.1 |
0.07 |
0.06 |
0.06 |
0.06 |
0.06 |
|
wooden_door |
Solid wooden door |
0.14 |
0.1 |
0.06 |
0.08 |
0.1 |
0.1 |
0.10 |
Floor coverings¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
linoleum_on_concrete |
Linoleum, asphalt, rubber, or cork tile on concrete |
0.02 |
0.03 |
0.03 |
0.03 |
0.03 |
0.02 |
|
carpet_cotton |
Cotton carpet |
0.07 |
0.31 |
0.49 |
0.81 |
0.66 |
0.54 |
0.48 |
carpet_tufted_9.5mm |
Loop pile tufted carpet, 1.4 kg/m2, 9.5 mm pile height: On hair pad, 3.0 kg/m2 |
0.1 |
0.4 |
0.62 |
0.7 |
0.63 |
0.88 |
|
carpet_thin |
Thin carpet, cemented to concrete |
0.02 |
0.04 |
0.08 |
0.2 |
0.35 |
0.4 |
|
carpet_6mm_closed_cell_foam |
6 mm pile carpet bonded to closed-cell foam underlay |
0.03 |
0.09 |
0.25 |
0.31 |
0.33 |
0.44 |
0.44 |
carpet_6mm_open_cell_foam |
6 mm pile carpet bonded to open-cell foam underlay |
0.03 |
0.09 |
0.2 |
0.54 |
0.7 |
0.72 |
0.72 |
carpet_tufted_9m |
9 mm tufted pile carpet on felt underlay |
0.08 |
0.08 |
0.3 |
0.6 |
0.75 |
0.8 |
0.80 |
felt_5mm |
Needle felt 5 mm stuck to concrete |
0.02 |
0.02 |
0.05 |
0.15 |
0.3 |
0.4 |
0.40 |
carpet_soft_10mm |
10 mm soft carpet on concrete |
0.09 |
0.08 |
0.21 |
0.26 |
0.27 |
0.37 |
|
carpet_hairy |
Hairy carpet on 3 mm felt |
0.11 |
0.14 |
0.37 |
0.43 |
0.27 |
0.25 |
0.25 |
carpet_rubber_5mm |
5 mm rubber carpet on concrete |
0.04 |
0.04 |
0.08 |
0.12 |
0.1 |
0.1 |
|
carpet_1.35_kg_m2 |
Carpet 1.35 kg/m2, on hair felt or foam rubber |
0.08 |
0.24 |
0.57 |
0.69 |
0.71 |
0.73 |
|
cocos_fibre_roll_29mm |
Cocos fibre roll felt, 29 mm thick (unstressed), reverse side clad with paper, 2.2 kg/m2, 2 Rayl |
0.1 |
0.13 |
0.22 |
0.35 |
0.47 |
0.57 |
Curtains¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
curtains_cotton_0.5 |
Cotton curtains (0.5 kg/m2) draped to 3/4 area approx. 130 mm from wall |
0.3 |
0.45 |
0.65 |
0.56 |
0.59 |
0.71 |
0.71 |
curtains_0.2 |
Curtains (0.2 kg/m2) hung 90 mm from wall |
0.05 |
0.06 |
0.39 |
0.63 |
0.7 |
0.73 |
0.73 |
curtains_cotton_0.33 |
Cotton cloth (0.33 kg/m2) folded to 7/8 area |
0.03 |
0.12 |
0.15 |
0.27 |
0.37 |
0.42 |
|
curtains_densely_woven |
Densely woven window curtains 90 mm from wall |
0.06 |
0.1 |
0.38 |
0.63 |
0.7 |
0.73 |
|
blinds_half_open |
Vertical blinds, 15 cm from wall, half opened (45°) |
0.03 |
0.09 |
0.24 |
0.46 |
0.79 |
0.76 |
|
blinds_open |
Vertical blinds, 15 cm from wall, open (90°) |
0.03 |
0.06 |
0.13 |
0.28 |
0.49 |
0.56 |
|
curtains_velvet |
Tight velvet curtains |
0.05 |
0.12 |
0.35 |
0.45 |
0.38 |
0.36 |
0.36 |
curtains_fabric |
Curtain fabric, 15 cm from wall |
0.1 |
0.38 |
0.63 |
0.52 |
0.55 |
0.65 |
|
curtains_fabric_folded |
Curtain fabric, folded, 15 cm from wall |
0.12 |
0.6 |
0.98 |
1 |
1 |
1 |
1.00 |
curtains_glass_mat |
Curtains of close-woven glass mat hung 50 mm from wall |
0.03 |
0.03 |
0.15 |
0.4 |
0.5 |
0.5 |
0.50 |
studio_curtains |
Studio curtains, 22 cm from wall |
0.36 |
0.26 |
0.51 |
0.45 |
0.62 |
0.76 |
Seating (2 seats per m2)¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
chairs_wooden |
Wooden chairs without cushion |
0.05 |
0.08 |
0.1 |
0.12 |
0.12 |
0.12 |
|
chairs_unoccupied_plastic |
Unoccupied plastic chairs |
0.06 |
0.1 |
0.1 |
0.2 |
0.3 |
0.2 |
0.20 |
chairs_medium_upholstered |
Medium upholstered concert chairs, empty |
0.49 |
0.66 |
0.8 |
0.88 |
0.82 |
0.7 |
|
chairs_heavy_upholstered |
Heavily upholstered seats, unoccupied |
0.7 |
0.76 |
0.81 |
0.84 |
0.84 |
0.81 |
|
chairs_upholstered_cloth |
Empty chairs, upholstered with cloth cover |
0.44 |
0.6 |
0.77 |
0.89 |
0.82 |
0.7 |
0.70 |
chairs_upholstered_leather |
Empty chairs, upholstered with leather cover |
0.4 |
0.5 |
0.58 |
0.61 |
0.58 |
0.5 |
0.50 |
chairs_upholstered_moderate |
Unoccupied, moderately upholstered chairs (0.90 m × 0.55 m) |
0.44 |
0.56 |
0.67 |
0.74 |
0.83 |
0.87 |
Audience (unless not specified explicitly, 2 persons per m2)¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
audience_orchestra_choir |
Areas with audience, orchestra or choir including narrow aisles |
0.6 |
0.74 |
0.88 |
0.96 |
0.93 |
0.85 |
0.85 |
audience_wooden_chairs_1_m2 |
Audience on wooden chairs, 1 per m2 |
0.16 |
0.24 |
0.56 |
0.69 |
0.81 |
0.78 |
0.78 |
audience_wooden_chairs_2_m2 |
Audience on wooden chairs, 2 per m2 |
0.24 |
0.4 |
0.78 |
0.98 |
0.96 |
0.87 |
0.87 |
orchestra_1.5_m2 |
Orchestra with instruments on podium, 1.5 m2 per person |
0.27 |
0.53 |
0.67 |
0.93 |
0.87 |
0.8 |
0.80 |
audience_0.72_m2 |
Audience area, 0.72 persons / m2 |
0.1 |
0.21 |
0.41 |
0.65 |
0.75 |
0.71 |
|
audience_1_m2 |
Audience area, 1 person / m2 |
0.16 |
0.29 |
0.55 |
0.8 |
0.92 |
0.9 |
|
audience_1.5_m2 |
Audience area, 1.5 persons / m2 |
0.22 |
0.38 |
0.71 |
0.95 |
0.99 |
0.99 |
|
audience_2_m2 |
Audience area, 2 persons / m2 |
0.26 |
0.46 |
0.87 |
0.99 |
0.99 |
0.99 |
|
audience_upholstered_chairs_1 |
Audience in moderately upholstered chairs 0,85 m × 0,63 m |
0.72 |
0.82 |
0.91 |
0.93 |
0.94 |
0.87 |
|
audience_upholstered_chairs_2 |
Audience in moderately upholstered chairs 0,90 m × 0,55 m |
0.55 |
0.86 |
0.83 |
0.87 |
0.9 |
0.87 |
Wall absorbers¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
panel_fabric_covered_6pcf |
Fabric-covered panel, 6 pcf rockwool core |
0.46 |
0.93 |
1 |
1 |
1 |
1 |
1.00 |
panel_fabric_covered_8pcf |
Fabric-covered panel, 8 pcf rockwool core |
0.21 |
0.66 |
1 |
1 |
0.97 |
0.98 |
0.98 |
facing_brick |
Facing-brick brickwork, open butt joins, brick dimensions 230 × 50 × 55 mm |
0.04 |
0.14 |
0.49 |
0.35 |
0.31 |
0.36 |
|
acoustical_plaster_25mm |
Acoustical plaster, approx. 25 mm thick, 3.5 kg/m2/cm |
0.17 |
0.36 |
0.66 |
0.65 |
0.62 |
0.68 |
|
rockwool_50mm_80kgm3 |
Rockwool thickness = 50 mm, 80 kg/m3 |
0.22 |
0.6 |
0.92 |
0.9 |
0.88 |
0.88 |
0.88 |
rockwool_50mm_40kgm3 |
Rockwool thickness = 50 mm, 40 kg/m3 |
0.23 |
0.59 |
0.86 |
0.86 |
0.86 |
0.86 |
0.86 |
mineral_wool_50mm_40kgm3 |
50 mm mineral wool (40 kg/m3), glued to wall, untreated surface |
0.15 |
0.7 |
0.6 |
0.6 |
0.85 |
0.9 |
0.90 |
mineral_wool_50mm_70kgm3 |
50 mm mineral wool (70 kg/m3) 300 mm in front of wall |
0.7 |
0.45 |
0.65 |
0.6 |
0.75 |
0.65 |
0.65 |
gypsum_board |
Gypsum board, perforation 19.6%, hole diameter 15 mm, backed by fibrous web 12 Rayl, 100 mm cavity filled with mineral fibre mat 1,05 kg/m2, 7,5 Rayl |
0.3 |
0.69 |
1 |
0.81 |
0.66 |
0.62 |
|
perforated_veneered_chipboard |
Perforated veneered chipboard, 50 mm, 1 mm holes, 3 mm spacing, 9% hole surface ratio, 150 mm cavity filled with 30 mm mineral wool |
0.41 |
0.67 |
0.58 |
0.59 |
0.68 |
0.35 |
|
fibre_absorber_1 |
Fibre absorber, mineral fibre, 20 mm thick, 3.4 kg/m2, 50 mm cavity |
0.2 |
0.56 |
0.82 |
0.87 |
0.7 |
0.53 |
|
fibre_absorber_2 |
Fibre absorber, mats of porous flexible fibrous web fabric, self-extinguishing |
0.07 |
0.07 |
0.2 |
0.41 |
0.75 |
0.97 |
Ceiling absorbers¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
ceiling_plasterboard |
Plasterboard ceiling on battens with large air-space above |
0.2 |
0.15 |
0.1 |
0.08 |
0.04 |
0.02 |
|
ceiling_fibre_abosrber |
Fibre absorber on perforated sheet metal cartridge, 0,5 mm zinc-plated steel, 1.5 mm hole diameter, 200 mm cavity filled with 20 mm mineral wool (20 kg/m3), inflammable |
0.48 |
0.97 |
1 |
0.97 |
1 |
1 |
1.00 |
ceiling_fissured_tile |
Fissured ceiling tile |
0.49 |
0.53 |
0.53 |
0.75 |
0.92 |
0.99 |
|
ceiling_perforated_gypsum_board |
Perforated 27 mm gypsum board (16%), d = 4,5 mm, 300 mm from ceiling |
0.45 |
0.55 |
0.6 |
0.9 |
0.86 |
0.75 |
|
ceiling_melamine_foam |
Wedge-shaped, melamine foam, ceiling tile |
0.12 |
0.33 |
0.83 |
0.97 |
0.98 |
0.95 |
|
ceiling_metal_panel |
Metal panel ceiling, backed by 20 mm Sillan acoustic tiles, panel width 85 mm, panel spacing 15 mm, cavity 35 cm |
0.59 |
0.8 |
0.82 |
0.65 |
0.27 |
0.23 |
Special absorbers¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
microperforated_foil_kaefer |
Microperforated foil “Microsorber” (Kaefer) |
0.06 |
0.28 |
0.7 |
0.68 |
0.74 |
0.53 |
|
microperforated_glass_sheets |
Microperforated glass sheets, 5 mm cavity |
0.1 |
0.45 |
0.85 |
0.3 |
0.1 |
0.05 |
|
hanging_absorber_panels_1 |
Hanging absorber panels (foam), 400 mm depth, 400 mm distance |
0.25 |
0.45 |
0.8 |
0.9 |
0.85 |
0.8 |
|
hanging_absorber_panels_2 |
Hanging absorber panels (foam), 400 mm depth, 700 mm distance |
0.2 |
0.3 |
0.6 |
0.75 |
0.7 |
0.7 |
Scattering Coefficients¶
Diffusers¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
rpg_skyline |
Diffuser RPG Skyline |
0.01 |
0.08 |
0.45 |
0.82 |
1 |
||
rpg_qrd |
Diffuser RPG QRD |
0.06 |
0.15 |
0.45 |
0.95 |
0.88 |
0.91 |
Seating and audience¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
theatre_audience |
Theatre Audience |
0.3 |
0.5 |
0.6 |
0.6 |
0.7 |
0.70 |
0.70 |
classroom_tables |
Rows of classroom tables and persons on chairs |
0.2 |
0.3 |
0.4 |
0.5 |
0.5 |
0.60 |
0.60 |
amphitheatre_steps |
Amphitheatre steps, length 82 cm, height 30 cm (Farnetani 2005) |
0.05 |
0.45 |
0.75 |
0.9 |
0.9 |
Round Robin III – wall and ceiling¶
keyword |
description |
125 Hz |
250 Hz |
500 Hz |
1 kHz |
2 kHz |
4 kHz |
8 kHz |
---|---|---|---|---|---|---|---|---|
rect_prism_boxes |
Rectangularandprismboxes (studio wall) “Round Robin III” (after (Bork 2005a)) |
0.5 |
0.9 |
0.95 |
0.95 |
0.95 |
0.95 |
|
trapezoidal_boxes |
Trapezoidal boxes (studio ceiling) “Round Robin III” (after (Bork 2005a)) |
0.13 |
0.56 |
0.95 |
0.95 |
0.95 |
0.95 |