7 questions about rock wool panel
Question 1: what are the advantages of rock wool in building heat preservation and fire prevention? What problems should be paid attention to in building heat preservation and fire prevention?
Answer: building fire is a very terrible thing that no one wants to see. Rock wool itself belongs to silicate fiber inorganic material, nonflammable, rock wool has heat preservation and insulation, belongs to class a fireproof material. When using rock wool fire insulation panel, not only the effect of heat preservation is ensured, but also the fire performance meets the fire protection standard.
The following points should be done well in the fire protection of external wall insulation: one is to strictly implement various fire laws and regulations, and strictly implement the fire protection system. Select the thermal insulation materials, take fire prevention measures for the primary stage of the use of thermal insulation materials, monitor the construction process for the intermediate stage of the use of thermal insulation materials, and prevent the possibility of various fires; after the thermal insulation materials are made into the external wall thermal insulation system, properly use the thermal insulation system and prevent fires.
Question 2: to use rock wool products with good thermal conductivity and fire resistance, does it mean that the requirements of tensile strength, water absorption and durability must be reduced?
Answer: the high-quality rock wool produced in China can completely meet all the requirements of tensile strength, water absorption, durability and heat preservation performance, and belongs to class a non-combustible material. In most applications, the thermal insulation performance of rock wool is comparable to that of polystyrene panel, and even exceeds that of polystyrene panel in some applications.
Question 3: what is the external wall insulation system? Can rock wool be applied to the external wall insulation composite system?
Answer: the external thermal insulation system of the external wall refers to an engineering practice that uses certain fixed methods (bonding, mechanical anchoring, spraying, pouring, etc.) to fix the thermal insulation material with low thermal conductivity (better thermal insulation effect) and the building wall, increase the average thermal resistance value of the wall, so as to achieve the thermal insulation or insulation effect.
Rock wool external wall thermal insulation system has the advantages of low thermal conductivity, good permeability and high combustion performance level. It can be applied to the energy-saving thermal insulation engineering of new, expanded and reconstructed residential buildings and public buildings, including external wall thermal insulation, non-transparent curtain wall thermal insulation and fire insulation belt of EPS external thermal insulation system. It can be used together with thermal insulation materials with combustion performance less than Grade A, so as to improve the fire-fighting and fire-fighting function of the building exterior wall. Rock wool is an excellent thermal insulation product for composite system of external wall external insulation. Not only that, because of its non-combustible performance, rock wool is also a solution for building fire safety, and is regarded as the preferred material and solution for high-rise buildings. The flammability of foam insulation products will cause great risk and damage to people and property. Therefore, Europe and the United States are not allowed to use this material in high-rise buildings.
Question 4: in Europe, such as Germany, does rock wool only occupy a small market share in all applications of external insulation composite system?
Answer: in Germany, for high-rise buildings with a height of more than 22 meters, the market share of rock wool in the external insulation composite system is 100%. Rock wool accounts for 5.6% of the market share in all applications of external insulation composite system, but this statistical result includes the most common building in Europe: low-rise-single family residence, which is not comparable with the high-rise building structures prevailing in China.
Question 5: what's the difference between rock wool and slag wool?
Answer: rock wool and slag wool belong to different products. The main component of slag cotton is slag, which has the characteristics of high slag ball content, low melting point and acidity coefficient. Therefore, the thermal conductivity of slag cotton is high, and it will have very serious thermal shrinkage in case of fire.
Slag cotton cannot be used in projects with fire protection requirements. Moreover, slag cotton cannot meet the application of external insulation composite system, so it should not be used in external insulation composite system.
Question 6: will rock wool cause harm to human health?
Answer: of course not. Some organizations (such as the World Health Organization) have conducted a large number of studies on whether rock wool fiber is carcinogenic, and the results clearly show that rock wool fiber is not a carcinogen. The results show that "adiabatic glass wool, continuous glass fiber, rock wool and residue cotton cannot be classified as human carcinogens (Class 3)". Studies on carcinogenicity of rock wool are well known, and these reports are public. In addition, as far as health issues are concerned, we are not aware of any restrictions on the use of rock wool.
It is worth mentioning that in order to make some foam products reach the B1 level, the flame retardant HBCDD is a PBT substance (persistent, bio-accumulative, toxic substances). The EU chemical agency has decided to include HBCDD in the substance that needs special attention (SVHC). From production to installation and removal, mineral wool (including rock wool) can be excluded as harmful substances.
Question 7: will rock wool production process consume a lot of energy and produce a lot of emissions?
Answer: all or most of the production waste in modern factories is recyclable. After a small amount of waste is treated, the emissions will be reduced to the lowest level. One unit of rock wool can save 100 times of energy consumption in its use than in its production. Making 1kg rock wool consumes about 20mj of energy, while making 1kg polystyrene board consumes at least 85mj. The raw materials for polystyrene board are mainly fossil fuels such as oil and natural gas, while rock wool only needs to be made from very common rock (basalt), and its available reserves are almost unlimited.