The aim of this study is to investigate the feasibility of using glass fibers, a recycled material from waste
printed circuit boards (WPCB), as sound absorption and thermal insulation material. Glass fibers were
obtained through a fluidized-bed recycling process. Acoustic properties of the recovered glass fibers (RGF)
were measured and compared with some commercial sound absorbing materials, such as expanded perlite
(EP), expanded vermiculite (EV), and commercial glass fiber. Results show that RGF have good sound
absorption ability over the whole tested frequency range (100-6400 Hz). The average sound absorption
coefficient of RGF is 0.86, which is prior to those of EP (0.81) and EV (0.73). Noise reduction coefficient
analysis indicates that the absorption ability of RGF can meet the requirement of II rating for sound
absorbing material according to national standard. The thermal insulation results show that RGF has a fair
low thermal conductivity (0.046 W/m K), which is comparable to those of some insulation materials (i.e.,
EV, EP, and rock wool). Besides, an empirical dependence of thermal conductivity on material temperature
was determined for RGF. All the results showed that the reuse of RGF for sound and thermal insulation
material provided a promising way for recycling WPCB and obtaining high beneficial products.