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Fiberglass has to be one of the best choices when it comes to soundproofing. It is useful to soundproof walls, ceilings, and floors in closed spaces like music production studios. Acoustic fiberglass as a form of audio insulation consists of rather small particles of compressed glass or plastic. In order to make this soundproofing material, the sand is heated and then spun on high speeds in order to form glass. It is also common that some manufacturers of acoustic fiberglass use recycled glass to produce the mentioned material. The common forms of fiberglass used for soundproofing come in the form of batts or rolls. Other common twhich usually fill attics and ceilings have a somewhat loose-fill form. Also, it comes in rigid boards, and insulation explicitly made for ductwork
link:https://www.lvildiy.com/acoustic-panel/acoustic-ceiling/New-design-Glass-Fiber-Sound-Absorbing-Drop.html
New design Glass Fiber Sound Absorbing Drop