Acoustic Absorption of Natural Fiber Composites

Table 2

Acoustic performances of various fibrogranular composites.

Year	Components	Frequency (Hz)	SAC	Ref.
2008	Nylon 66 fibers + PVC	1000	0.85	[19]
2008	Nylon fibers + RG	1000	0.91	[19]
2010	Coconut coir fiber + RG	1600	0.9	[5]
2011	PVC + Nylon fiber	1000	0.7–1.0	[20]
2012	Pine sawdust + RG + PU	1000	0.85	[21]
2012	Ground tire rubber + fiber	1000–2000	0.8–1.0	[3]
2013	RG + fiber + RG (multilayer panels)	1000–1500	5.5–6.5	[22]
2013	Cotton fiber + RG	500	0.74	[23]

SAC, RG, and PU are the sound absorption coefficient, rubber grain, and polyurethane, respectively.