PRODUCT DESCRIPTION: Composition: Double-layer steel plate, lined with rock wool (mineral wool), made by hand craft. Rock wool, also known as rock wool, is mainly composed of basalt, which is a fluffy short fiber made of natural rock and mineral materials, and is not combustible. Advantages: good fire resistance, high sound insulation performance. Application: widely used in food, medicine, electronics, scientific research, aerospace, medicine and other industries of plant, laboratory and various places of partition, ceiling