ANALISIS PEMANFAATAN SERAT RESAM DENGAN MATRIK POLYESTER SEBAGAI BAHAN ALTERNATIF PEREDAM SUARA

Resam is a type of fern or fern that usually grows in shady and humid areas. Resam
plants are widely found in the province of Bangka Belitung so that their availability
is abundant to be made into composite fillers. Composite is a combination of two
or more materials that have different properties from one another. Composite
materials have properties that are strong, corrosive resistant, lightweight, and
inexpensive and can be applied as an alternative sound dampening material. The
purpose of this study was to determine the effect of volume fraction and length of
NaOH immersion on the sound absorption coefficient value and to determine that
resam fibre composite with polyester matrik can be used as an alternative sound
absorbing material. Making specimens using hand lay-up method and research
design using full factorial method. Based on the results of the study, it was found
that the largest sound absorption coefficient value was found in specimen number
6 with a volume fraction of 15%: 85% and the immersion time of NaOH solution
for 90 minutes amounting to (α = 0.218). While the lowest sound absorption
coefficient value is found in specimen no 7 with a volume fraction of 5%: 95% and
the length of immersion in NaOH solution for 60 minutes amounting to (α = 0.185).
So that this composite material can be used as an alternative sound absorbing
material because it meets the ISO 11654 standard with a minimum value of (α =
0.15). This composite material is included in the classification of class E
soundproofing materials.
Keywords: resam, composite, silencer, hand lay-up, full factorial.