@article{MAKHILLRJAS2017121010047,
    title = {Acoustical and Mechanical Properties of Environmental Friendly Acoustic Panel
Made from Pumice Waste with Polyester Binder},
    journal = {Research Journal of Applied Sciences},
    volume = {12},
    number = {10},
    pages = {430-434},
    year = {2017},
    issn = {1815-932x},
    doi = {rjasci.2017.430.434},
    url = {https://makhillpublications.co/view-article.php?issn=1815-932x&doi=rjasci.2017.430.434},
    author = {Ngakan Putu Gede,I. Made,I. Putu and},
    keywords = {Pumice waste,composite,transmission loss,impact,bending,mechanical},
    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.}
    }