... the upper and lower plate. Glass magnesium board, plasterboard, rockwool, polyurethane(PU), EPS and aluminium or paper honeycomb can be chosen ... installed according to the requirements of the engineering project. As a result, the cost of foundation work and structure work can ... of food producdtion and fire-proof workshop of chemical industry. Polyurethane(PU) Sound Absorption Purified Manual Plate