Acoustic fabric that absorbs sound waves. It clearly contributes to noise reduction in a room. The EN ISO 10534-2 norm is defined according to Kundt tube test. It determines the acoustic absorption factors.
Sound is produced through vibrations. The vibration speed or the frequence is defined in Hertz. One hertz (Hz) corresponds to a vibration per second. A kilohertz(kHz) corresponds to 1000 vibrations per second and one megahertz (MHz) to 1 million vibrations per second.
The ear detects sounds on a frequency scale ranging from 16 hertz to 16000 hertz. The higher the frequency, the more the sound seems high-pitched to the human ear.
When a sound wave is in contact with material, one part of its energy is reflected, another part is absorbed, the remaining one is transmitted. The acoustic quality of a room may thus be optimized with the materials used in the space and their acoustic absorption ability.
The Kundt tube method
Sotexpro measures the absorption coefficient by using the Kundt tube method (EN ISO 10534-2 norm).
A material sample is subjected to acoustic waves emitted through a lound speaker.
The absorbption coefficient and surface impedance of material are reduced according to the transfer function between the pressures measured by microphone 1 and 2.
The technical properties
Acoustic fabric properties:
- controlling the ambient sound level in a room
Our blackout fabrics are highly recommended pour living areas, dining areas in restaurants, rooms , business areas, meeting rooms, offices...
Our acoustic fabrics are also M1 flame retardant.