Experimental Survey of the Sound Absorption Performance of Natural Fibres in Comparison with Conventional Insulating Materials

The purpose of this research is to investigate the acoustic properties natural fibres and compare them with values achieved by common insulation materials used in construction buildings. Three based on biomass were for testing, namely cork, hemp fibreboard. From group conventional materials, mineral wool, propylat polyurethane foam selected. For determining sound absorption coefficient (α), absorber specimens tested using impedance tube two microphones method, according standard ISO 10534-2. measurement was performed thicknesses 20, 40, 60, 80 100 mm. highest all measured a sample at frequency 2000 Hz (α = 0.99) thickness 20 lowest performance cork same 0.02). Among dominated entire range thicknesses. from 160 500 tendency exceed fibreboard sample. wool best results, while recorded occasional exception frequencies 1600 2500 Hz.