The waste polystyrene foamed plastics are being used to make the insulator, developed by the City Management Research Institute under the State Academy of Sciences.

The institute also established a process for mass-producing this insulator, an environment-friendly building material, with its own efforts and technology.

According to Kim Chang Su, a section chief of the institute, the compound heat insulator, with low production cost, was applied to building a hotel for scientists at Sci-Tech Complex and other projects.

The DPRK pays big efforts to building environment-friendly and energy-saving buildings.