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 ================= ============================================================================= ======== ======== ======== ======= ======= ======= =======