Benzene board equipment

Phoenix News> Scrolling News> Text The fatal foam board of the Shanghai fire is still not banned at 00:54 on November 19, 2010, Beijing Morning News [Large, Medium and Small] [Print] A total of 0 comments were investigated by reporters in the Beijing building materials market and found that new polyurethane products are generally available for sale The main culprit of the Shanghai residential building fire next year-polyurethane foam is not a banned product, and is sold and widely used in this city. Yesterday, the reporter visited the building materials market near the Shili River in Beijing. The merchants selling polyurethane and other foam panels bluntly told the reporter that they have poor flame retardancy. What's more frightening is that polyurethane foam can release highly toxic gas after burning, which can kill you if you breathe it in. Sun Shibing, a senior engineer at the School of Materials Science and Engineering, Beijing University of Technology, told the Morning Post that relevant departments such as the Beijing Municipal Science and Technology Commission and the Construction Committee have established a project to transform the existing rock wool industrial thermal insulation production line in Beijing into a building thermal insulation production line, which is expected to be put into production next year. Citizens may not be able to wait for the mass production of the new materials. The 'high-level escape secret' has been circulating on the Internet, and the toilets have been deemed the safest. Policy point: Polyurethane is not banned. As for the polyurethane foam insulation material in the '11·15' fire, according to the 'Beijing Municipal Housing and Construction Commission's 'Beijing Promotion, Restriction, and Prohibition of the Use of Building Materials Catalog (2010 Edition)Prohibited list of materials. The relevant person in charge of the Municipal Housing and Construction Commission stated that the current use of building materials in this city is also regulated in accordance with the catalog. He also said that if the relevant competent departments issue new regulations on the use of insulation materials, the city will strictly implement them. According to the catalog released in September this year, the city banned the use of three types of insulation materials, but no polyurethane materials. These three banned materials are 'cement (gypsum) polystyrene insulation board not reinforced with glass fiber meshThe reason for being banned is not flammability, but poor performance, easy cracking, or poor thermal insulation effect. Morning News reporter Zhao Yang market visited Chengpian'er foam board. Playing with lighters, reporters found that it is difficult to find insulation foam in the building materials market with more exquisite decoration and higher commodity prices such as Midland World. In the shabby old Minle building materials market, the reporter saw piles of foam boards. The plate area is a dark warehouse. The stall owners are gathering together to talk about the 'Shanghai Fire'. At the door of the warehouse, a small worker plays with a lighter. The reporter saw that the foam boards in the warehouse are divided into two types, one is made of white round beads and the other is blue, which looks harder and is not easy to scratch with nails. A stall owner told reporters that both foam boards are made of polystyrene. The white foam board is 2 meters long, 1 meter wide and 4 cm thick. Each foam board costs 10 yuan. The blue foam board is 3 cm thick, 1.2 meters long, 0.6 meters wide, and costs 19 yuan each. 'This is the most common insulation material for external walls. Foam board also has moisture-proof function. I have thicker and thinner ones. Generally, blue ones are more expensive because of higher density and relatively flame retardant. Better.' Then, the stall owner took a lighter to demonstrate to the reporter. As soon as the blue foam board touched the flame, the stall owner pulled the lighter away from under the foam board. The flame went out instantly, leaving a circle of black scorch marks on the blue foam board. As for the white foam board, the stall owner dared not try it. Another female boss told reporters that the external wall insulation material used by CCTV in the fire was polystyrene, 'it is not flame-retardant, but there is no way. Insulation materials are the same, and it is not flame-retardant to keep it warm.' Polyurethane is 'not recommended, not restricted.' With polystyrene, the reporter continued to look for polyurethane (PU), the culprit of the recent Shanghai fire in the building materials market. A shopkeeper selling waterproof materials told reporters that her family’s polyurethane is divided into two types, one is a black waterproof material, priced at 285 yuan (20 kg); the other is a black rolled solid foam material, sold The price is 460 yuan for 20 square meters, which sells well. According to related reports, the polyurethane used in Shanghai Guohuo Building is a material that can expand into yellow foam. It is understood that polyurethane material is actually recognized as the best material for external wall insulation materials, and the price is relatively high, accounting for only about 10% of the market share. It has higher thermal conductivity and better thermal insulation. However, the disadvantage of this material is its poor flame retardancy, fast burning speed and excessive droplets during the combustion process, which will easily lead to the accelerated spread of the fire. Once it burns, it will also produce highly toxic gas. The shopkeeper said that materials such as polyurethane and polystyrene belong to the scope of 'not recommended or restricted' and are currently used in a wide range of markets. Morning News reporter Zhang Lu produces highly toxic hydrogen cyanide gas polyurethane after fatal burning, which suddenly became after the Shanghai fire |>>>|