... centers, transformer substations, sentry boxes and other prefabricated houses.3. Advantages of the EPS sandwich wall panel:1)Low ... dramatically.2)Light weight,Thermal&fire-proof,insulation,sound-proof,cold-proof,damp-proof3)Quake-proof,radiationless,High bending strength,Nonabsorbent4. The ... color steel sheet,(2)the inner layer is EPSsandwich,(3)the bottom layer is also steel sheetRockwool density100- ...