The building insulation that rock wool is mainly used for can roughly includes wall insulation, roof insulation, door insulation, ground insulation, etc., among which the wall insulation is the most important, and two forms, i.e. site composite wall and prefabricated composite wall, can be adopted, wherein one of the former is the internal insulation of external wall, namely, the brick wall, reinforced concrete wall, glass curtain wall or sheet metal is adopted on the outer layer, the air layer and rock wool layer are located in the middle, and the gypsum plaster board is adopted in the internal surface. The other one is the external insulation of external wall, namely, the rock wool layer is stuck on the outer layer of building, and the exterior layer is added, with the advantage of having no influence on the usable area of building. The external insulating layer is fully closed, thereby basically eliminating the cold and hot bridge phenomena; and moreover, the insulation performance is superior to that of internal insulation of external wall. The prefabricated composite wall is the various rock wool sandwich composite board. The promotion of rock wall composite wall has important significance for building energy saving in China and especially in northern cold regions
The rock wool is very suitable for the thermal insulation of building and industrial equipment, pipeline, container and various kilns because it has excellent thermal insulation and also has good fire protection function when compared with EPS foam. The thermal insulation of building can prevent the heat loss in winter and heat gain in summer, is the biggest application field of rock wool.
The rock wool insulation board is widely used in thermal insulation of the tank with big plane radius of curvature, boiler, heat exchanger and other equipment and buildings, and generally, has the usage temperature of 600℃; and also, it can play the role of insulation and fire protection in the bulkhead and ceiling of ships. The rock wool glass cloth joint felt is mainly used in the thermal insulation of equipment having complicated shape, high operating temperature and others, and generally, has the usage temperature of 400℃. In case of increasing the construction volume weight to reach above 100 kg/m3, increasing the volume weight of insulation nail and adopting the outer protection of metal, the usage temperature can reach 600℃. The rock wool iron wire net joint felt is mostly used in the insulation of tank, pipeline, boiler and other high-temperature equipment, and has the usage temperature of 600℃; and in case of increasing the construction volume weight, increasing the volume weight of insulation nail and adopting the outer protection of metal, the effect will be better. The rock wool insulation belt is widely used in the thermal insulation of large-diameter pipeline, storage tank and other equipment; and generally, its usage temperature is not more than 400℃. The rock wool tube shell is mainly used for the thermal insulation of small-diameter pipeline, the maximum usage temperature of dry-process pipe shall not be more than 600℃, and the maximum usage temperature of wet-process pipe shall not be more than 400℃.
In addition, the granular rock wool produced in some developed countries is used for the insulation of roof ceiling and sandwich wall; and meanwhile, it can be used as the spraying material to be coated on the surface of the wall, beam column or kiln for fire protection and insulation.
When carrying out the thermal insulation construction, it is required that the insulated surface shall be clean and dry; and for the metal surface easily corroded, the appropriate anticorrosive coating can be firstly carried out. The connection of joints of insulation materials must be tight, to reduce the heat loss. When adopting the multi-layer insulation, the joints of all layers shall be laid in a staggered manner, so as to avoid the cold and hot bridge. For the low-temperature insulation, the vapour barrier shall be added on the cold surface for the outdoor insulation or easily damaged parts, the exterior shall be wrapped with the metal or plastics, and the attention shall be given to the sealing of joints and seams and overlapping of cladding. When the temperature is higher than 200℃, the insulating layer shall be subjected to the outer protection appropriately, to prevent change in its thickness and volume weight due to the thermal expansion.完
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