Sound absorptionαw 0.55 (MH) · Class D (ISO 11654), measured on the material by CARE-CEDIA, University of Liège, report 2017/7092. The report states no NRC value
What it doesIt takes the edge off a room and shortens reverberation, which is what open-plan floors and meeting rooms need. It is not a substitute for a rated ceiling absorber
Reading the figureαw is the single-number rating of ISO 11654, weighted across frequencies. It is not an NRC: that figure comes from ASTM C423, is arrived at differently, and the Ball Moss report does not contain one
Full lab reports in Technical resources. For a measured ceiling absorber, see Rings or Hoverlight.
Build-upPreserved ball moss set by hand, about 35 mm deep · about 12 kg/m² excluding support · 6 mm fire-retardant MDF backing (Panolux FIRAX, FR-MDF.LA to EN 622-5, E1, PEFC/FSC). Cork, recycled felt, aluminium and dibond are available instead
SizeMade to measure, by the square metre. There is no catalogue format: panels are cut to the wall
Fire, EuropeB-s1,d0 · EN 13501-1:2010-01, MPA Dresden classification report 20180038/01.3, notified body 0767, product « Kugelmoos »
That class is valid forThe moss bonded directly to plasterboard of at least 519 kg/m³, or to any A1 or A2-s1,d0 product of at least 519 kg/m³ · about 1.6 kg/m² of Jowacoll 746.20 · the tested thickness of about 35 mm and the tested colour
Fire, North AmericaFSI 0 / SDI 10, Class A · ASTM E84-20, Intertek report L2417.01-121-24
Conditions of useIndoor only · 40% to 80% relative humidity · away from direct sunlight, water, heat and physical contact
MaintenanceNo watering, no daylight or artificial light, no trimming · keeps its form, colour and texture for up to 7 years