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Synthetic materials are still extensively used as acoustic absorbent in house hold appliances & architectural applications. These non biodegradable materials not only hazardous to the environment but also are significant contributors as emitting green house gas to the atmosphere during the time of their production. Today, agricultural residues play a challenging role for causing pollution hazards to the environment. So rather burning them, a lot of trial has been conducted to find better utilization of them. These natural materials have become an alternative to traditional synthetic materials as acoustic materials. Therefore corresponding research is conducted to identify sustainable, eco - friendly, green materials as alternative sound absorber at a reduced cost. The natural fibers often show good thermal insulation properties, have least harmful effects on health and are plentily available as residue of other production cycles. This short review briefly illustrates the acoustical characterization of some natural fibers ( wood, kenaf, cork, coconut, hemp, sugarcane, card board, ramie, jute, flax, sheep wool). by using the existing theoretical models, this study compares the measured behavior with theoretical predicted behavior. It was concluded that multi functional composites can be fabricated from natural fibers to achieve both mechanical and acoustical functions.
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