Kapok fibre is used as a room damper

Natural fibers generally have the ability to absorb sound to control noise. A silencer or sound absorber is a material that can absorb sound energy from a sound source whose function is to control noise. The influence of noise will have psychological and biological effects on humans, such as decreased comfort, concentration, and stress on the heart, circulatory system or air circulation/respiratory system, and disrupt verbal communication, and can even cause temporary reduction in hearing ability, or permanent damage to the sense of hearing.