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2. Blackout (fabric) - Wikipedia

   en.wikipedia.org/wiki/Blackout_(fabric)

   The process of manufacturing blackout was invented by Baltimore-based Rockland Industries, [2] and involves coating a fabric with layers of foam, or 'passes'. A '2-pass' blackout is produced by applying two passes of foam to a fabric – first, a black layer is applied to the fabric, then a white or light-colored layer is applied on top of the black.

3. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   A 0.1% open area will reduce the transmission loss from 40 dB to 30 dB, which is typical of walls where caulking has not been applied effectively [26] Partitions that are inadequately sealed and contain back-to-back electrical boxes, untreated recessed lighting and unsealed pipes offer flanking paths for sound and significant leakage.

4. Curtain - Wikipedia

   en.wikipedia.org/wiki/Curtain

   Sash curtains are used to cover the lower sash of the windows. Rod pocket curtains have a channel sewn into the top of the fabric. A curtain rod is passed through the channel to hang. [15] Thermal or blackout curtains use very tightly woven fabric, usually in multiple layers. They not only block out the light, but can also serve as an acoustic ...

5. Noise reduction coefficient - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction_coefficient

   The noise reduction coefficient (commonly abbreviated NRC) is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency sounds, but rather reflects sound energy.

6. Sound reduction index - Wikipedia

   en.wikipedia.org/wiki/Sound_Reduction_Index

   The Sound Reduction Index is expressed in decibels (dB). It is the weighted sound reduction index for a partition or single component only. This is a laboratory-only measurement, which uses knowledge of the relative sizes of the rooms in the test suite, and the reverberation time in the receiving room, and the known level of noise which can pass between the rooms in the suite by other routes ...

7. Acoustic panel - Wikipedia

   en.wikipedia.org/wiki/Acoustic_panel

   Most panels are constructed with a wooden frame, filled with sound absorption material (mineral wool, fiber glass, cellulose, open cell foam, or combination of) and wrapped with fabric. [2] An acoustic board is a board made from sound absorbing materials, designed to provide sound insulation.