Building energy conservation is a basic national policy of our country. The State Council's "Green Building Action Plan" and the national standard GB8624-2012 "Classification of Combustibility of Building Materials and Products" mandatory standards emphasize that thermal insulation materials should not only be efficient and energy-saving, but also fire safety and reliability. Rock wool, as an important building energy-saving material, has both heat preservation and fire protection performance. It can not only save energy in buildings but also protect the safety of people's lives and property. However, many people do not understand or even have some misunderstanding about the thermal insulation system of rock wool. To this end, the author visited the relevant experts in the rock wool industry, asking them to answer questions of concern to everyone.
Question 1: What are the advantages of rock wool in building thermal insulation and fire prevention? What problems should be paid attention to in doing a good job of external wall thermal insulation and fire prevention?
Answer: building fires are terrible things that no one wants to see. Rock wool itself belongs to silicate fiber inorganic material, non-flammable, rock wool with insulation, belongs to class A fire-proof material. In the use of rock wool fire insulation board, not only to ensure the effect of heat preservation, but also meet the fire performance standards.
To do a good job in exterior wall insulation fireproofing needs to do the following points, one is to strictly implement various fire laws and regulations, strictly implement the fire control system. Choose good insulation materials, do a good job in the use of thermal insulation materials at the primary stage of fire prevention measures, insulation materials in the use of intermediate stage to do a good job in the construction process monitoring, to prevent the possibility of fire; insulation materials made into external wall insulation system, do a good job in the use of thermal insulation system and prevent fire.
Question 2: Does the use of rock wool products with good thermal conductivity and fire resistance mean that tensile strength, water absorption and durability must be reduced?
Answer: The high quality rock wool produced in our country 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, rock wool insulation performance can be compared with polystyrene board, and even in some applications more than polystyrene board insulation performance.
Question three: what is external wall insulation system? Can rock wool be applied to external thermal insulation composite system?
Answer: Exterior wall insulation system refers to a certain fixed way (bonding, mechanical anchorage, spraying, pouring, etc.), the thermal conductivity of low (better insulation effect) insulation material and building wall fixed in one, increase the average thermal resistance of the wall, so as to achieve thermal insulation or insulation effect of an engineering practice.
Rock wool external wall insulation system has the advantages of low thermal conductivity, good air permeability and high combustion performance. It can be used in energy-saving insulation projects of new, expanded and rebuilt residential buildings and public buildings, including external wall insulation, non-transparent curtain wall insulation and fire-proof isolation belt of EPS external insulation system. It can be used in conjunction with insulation materials whose combustion performance can not reach Class A to improve the fire prevention function of the exterior wall of the building. Rock wool is an excellent insulation product for exterior wall insulation system. Not only that, because of its non-flammability, rock wool is also a kind of building fire safety solution, and is considered as the preferred material and solution for high-rise buildings, which are fully reflected in EN13500 and ETAG004 standards. 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 account for only a small market share in all exterior insulation systems?
Answer: In Germany, the market share of rock wool in exterior insulation composite system is 100% for high-rise buildings above 22 meters. Rock wool accounts for 5.6% of all exterior insulation applications, but this statistic includes the most common building in Europe: low-rise single-family housing, which is not comparable to the high-rise building structures prevalent in China.
Question five: what is the difference between rock wool and slag cotton?
Answer: rock wool and slag cotton belong to different products. Slag cotton is the main component of slag, with high slag ball content, low melting point and acidity coefficient characteristics, therefore, slag cotton thermal conductivity is high, fire will have a very serious heat shrinkage.
Slag wool is not usually applied to projects with fire prevention requirements. And slag wool can not meet the application of external wall insulation composite system, so it should not be applied to external wall insulation composite system.
Question six: will rock wool damage human health?
Answer: of course not. Several tissues (e.g. the World Health Organization) have conducted extensive studies on the carcinogenicity of rock wool fibers, and the results clearly show that rock wool fibers are not carcinogens. The results showed that "insulated glass wool, continuous glass fiber, rock wool and cotton residue can not be classified as human carcinogens (category 3)". The study on the carcinogenicity of rock wool is well known and these studies are open. Moreover, as far as health is concerned, we do not know any restrictions on the application 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, bioaccumulative, toxic substances). The EU chemical agency has decided to include HBCDD in the substance that needs special attention (SVHC). From production to installation and demolition, mineral wool (including rock wool) can be excluded as harmful substances.
Question seven: will the rock wool production process consume a lot of energy and produce a lot of emissions?
Answer: All or most of the waste produced in modern factories is recyclable, leaving a small amount of waste after treatment, the emissions will be
