What is the fire resistance limit of rock wool board?

　　The fire resistance limit of rock wool board is about 1 hour. Rock wool board is an artificial inorganic fiber made of basalt through high-temperature melting. It has the characteristics of light weight, low thermal conductivity, heat absorption and non combustion. Its initial development is a common application type in buildings. It is mostly used in industrial buildings. It shall comply with the provisions of application types and basic requirements of building thermal insulation materials.

　　Appearance quality of rock wool board: the surface shall be flat and free of scars, stains and damages that hinder the utility. Combustion performance: non combustible. Thermal load shrinkage temperature: 643 degrees. Moisture absorption: 3.9%. Organic content: 2.9%.