Patent ID: 11898345
Assignee: CERTAINTEED CEILINGS CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 20:
21. An acoustic ceiling panel comprising:
an acoustic substrate formed of a porous material, the porous material comprising in the range of 60-95% on a dry weight basis of a fibrous material and in the range of 1-15% on a dry weight basis of a polymeric binder binding the fibrous material, the porous material having a density of at least 6 lb/ft3 and no more than 20 lb/ft3, the acoustic substrate having an air flow resistivity of at least 300 kPa*s/m2, the acoustic substrate including:
an upper face, and
a lower face with a pattern of perforations formed therein, the pattern of perforations covering at least 6% and no more than 25% of the area of the lower face, wherein the average depth of the perforations is at least 40% of the thickness of the acoustic substrate, and is no more than 90% of the thickness of the acoustic substrate, and the average size of the perforations is at least 0.25 mm and is no more than 5 mm;

a backing layer disposed over the upper face of the acoustic substrate; and
a veil disposed over the lower face.