how to made acoustic board?

Question

how to made acoustic board ? and what material did they use?

Answer 1

Wall and Ceiling acoustic furnishings made with a porous core of insulating board or mineral fibre tiles and a surface that has many round holes, or is fissured or riled. It can be fixed as full boards or made into acoustic tiles. Painting can block the holes and reduce sound absorbency; careful spraying with many thin coats of emulsion paint reduces mainly the high frequency sound absorption.