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Glass wool is usually a soundproofing materials made from glass fibers. Its primary function is to lessen the depth of sound from panel resonation reaching the ear (soundproofing) and its secondary functionality is for a heat insulator." CV. AGRO INDUSTRI SURABAYA " telp.031 3989496 fax. 031 3980197 , HP. 082129847777 , 082129846666 " e-mail. indus