Abstract: Comfortable working room is essential for environment of factory, hotel, office and privacy. Sound absorber material is very important to absorb voice/sound, so it will decrease the intensity of sound resonance to ear then, it will create comfortable room for the user. Development of waste-based sound absorber such as pumice which has porous structure, light and easily obtained from the waste of sifting process with <10 mm has characteristic of big opportunity to be used as acoustic material of wall covering. This study will review the feasibility of pumice panel (polyester and pumice) in absorbing sound so, it can be applied as acoustic wall. The purpose of this study is to determine transmission loss, impact strength and flexibility of the composite panel of pumice with real size for room application. Research material was pumice particle sized 3, 5 and 10 mm with weight fraction of 40, 60 and 80% for every size of the pumice particle. Materials for composite making process and treatment are aquades, polyester of Yukalac 157 BQTN, hardener of MEKPO and Glycerin. Specimen test of the composite was made by using Hand lay-up technique. It was found that highest sound absorption was the composite with weight fraction 60% and 3 mm size particle with result 35% transmission loss on 1500 Hz sound frequency. Meanwhile, the result on 2500-4000 Hz was obtained on composite with 40% of 3 mm pumice particle. The highest impact strength was obtained on composite of 80% composition of pumice and particle sized 10 mm. The highest bending strength (1.480 MPa) occurred on weight fraction 40% with particle size 10 mm of composite.
Ngakan Putu Gede Suardana, I. Made Parwata, I. Putu Lokantara and Ikg. Sugita, 2017. Acoustical and Mechanical Properties of Environmental Friendly Acoustic Panel Made from Pumice Waste with Polyester Binder. Research Journal of Applied Sciences, 12: 430-434.