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 |