... :depends on you Our sandwich panel is widly used in steel workshop, easy building, prefab building, civil buildng, prefabricated house, ceiling ... product, it is consist of two parts, the one is glass steel, the other one is polyurethane. it has excellent ability to ... earthquake and typhoon.For the thickness of exterial and interial steel is 0.286mm, the polyurethane can be 50mm, 75mm, 100mm ...