Mehrjui, Managing Director of Esteghraz Sazeh Khezra Co., said the prefabricated panels, called CSP, have been developed by three experts in three types of gypsum, cement and composite panels, and have completed their manufacturing and experimental stages. He emphasized that the panels are insulating against heat and sound, adding high strength, low weight, quick and easy installation, cost saving, and other benefits of using these panels in the construction industry.