At present, the production and use of thermal insulatio […]
At present, the production and use of thermal insulation materials in the new building materials industry are chaotic. The burning performance of thermal insulation materials for external walls of civil buildings should be Class A (non-combustible) and should not be lower than Class B2 (flammable). Malignant fire accidents of high-rise buildings with external wall insulation and decoration materials have repeatedly occurred, making the wall insulation material industry including chemical insulation materials such as polystyrene boards, extruded boards, polyurethane, etc., facing a safety test.
Analysis of Fire Causes of Outer Wall Insulation Materials
First, the industry standards are not complete and the product quality is uneven. The industry standards for exterior wall insulation materials are not yet complete, and there are loopholes in management of individual manufacturers. The produced exterior insulation materials simply do not meet the building fire design requirements, and the fire resistance levels and fire resistance limits do not meet national standards. After entering the market, it has laid down congenital security risks for building fire accidents.
Second, the construction period is long and there are many hidden dangers at the job site. For the construction industry, energy-saving insulation is a national policy, and wall insulation is an important means to achieve building energy conservation, so the application of building insulation materials is very wide. In reality, the construction period of high-rise buildings, large stadiums and other buildings generally takes two to three years, and various construction procedures cross each other, which is inconvenient to manage. Individual management personnel ignored the investigation and rectification of the fire hazards at the scene and the provision of temporary water for fire protection, and devoted all their energy to catching up with the construction period and reducing costs. During a long construction period of two to three years, there are many combustible materials on the job site, which makes it difficult to detect the fire hazard in time. The external wall insulation material has the characteristics of extremely rapid spread, hidden burning, and difficult to control if it catches fire. It is easy to cause major personnel and property damage due to the paralysis of the site personnel.
Third, the cost of qualified materials is high, and the construction unit is recharged. The current insulation materials are divided into A (non-combustible), B1 (flammable), B2 (combustible), and B3 (combustible) four grades. There are two types of inorganic insulation materials and organic insulation materials. The former is non-combustible, but the insulation effect Poor, only about 20% of the market share, the latter is characterized by good thermal insulation effect, but easy to burn, occupying 80% of the market, for this reason, it is necessary to add a certain amount of flame retardant to the material to achieve the standard, and flame retardant Agents are expensive. In order to maximize profit, many businesses add less flame retardants, and some do not even add them. Individual construction units deliberately purchase inferior thermal insulation materials, which can be recharged to save costs, and the fire supervision is not in place, it is easy to get confused.