Mineral wool, known by the trademark Rockwool, works better for soundproofing than fiberglass because it's denser and adds mass to the ceiling. The latter also contributes to sound dampening.

Acoustic ceiling tiles are often favored in office ... Mineral wool tiles can be more expensive, but do a great job of dampening sound; foam panels, on the other hand, aren't quite as effective ...

Fantoni's Letwood wall-mounted and ceiling-mounted sound-deadening systems combine innovative aesthetic design and top-quality acoustic insulation, meeting visual and practical requirements.