The artificial inorganic fiber made of rock wool board through high-temperature melting has the characteristics of light weight, low thermal conductivity, heat absorption and non combustion. The initial development is a common application type in buildings. It is mostly used in industrial buildings and should comply with the provisions of application types and basic requirements of building thermal insulation materials.
The rock wool board is composed of 66% diabase, 20% limestone and 20% coke. After melting in a high-temperature furnace at 1500 ~ 2000 ℃, it is sprayed into filaments with a diameter of 0.005 mm, and then pressed into plates with a unit weight of 80 ~ 1000 kg / m3. When it is cooled to about 200 ℃, phenolic resin is added to reduce the surface tension and make it water retaining. In 1969, Danish rock wool began to be used in soilless cultivation, which is a new substrate in soilless cultivation. Now 80% of the substrates of soilless cultivation in the Netherlands use rock wool. Among the soilless cultivation in the world, rock wool cultivation area ranks first.