B2 combustible materials "polyurethane foam" combustion produces toxic gases, 40 seconds can be deadly
North road is located in the happiness of yantai treasure letter automobile sales co., LTD., BMW 4 s store of construction site, a place with choi steel structures of migrant workers dormitory is being demolished. Originally, ZhiFu fire brigade inspection on the construction site, found that the houses of migrant workers is the dormitory with choi steel structures, and the color steel plate inside the filling material for polyurethane foam, belongs to the B2 combustible material, not the technical specification for construction engineering construction site fire safety provisions of a-class non-combustible material request, therefore was seized. Firefighters, polyurethane foam once combustion will produce poisonous gas, 40 seconds will make people suffocation death, so must be removed.
8 people lived in a shack six illegal room were removed
Happiness road north of yantai treasure letter automobile sales co., LTD., BMW 4 s store of construction site, the workers are removed with choi steel structures, dormitory housing. Between 12 noon and six simple shack caigang houses have been dismantled. On site, ZhiFu fire brigade inspectors told reporters that in their inspection on site, that the construction side there are 6 color with steel makeshift shack of migrant workers, "open the door a look, a hut also 15 square, but lived eight people." The reporter sees, less than one square metre of each houses window, in the event of fire, it will be hard to escape.
Combustion to produce poisonous gas, 40 seconds can be deadly
Removed the caigang fill the items in the powder layer is polyurethane foam, the reporter break down to a small piece, lit with lighter, the twinkling of an eye the flame has come up, and a pungent smell. ZhiFu fire brigade inspectors introduces to the reporter, polyurethane foam once combustion will produce highly poisonous hydrogen cyanide (HCN) gas, can let people suffocation death for 40 seconds.
Due to the low density polyurethane foam is porous and, to meet the fire burning, and not easy to self-extinguishing. "If there is a fire in his sleep, had no time to escape was passed out." In the event of fire, and in a short period of time will be several floors, easy to cause major workplace fire. ZhiFu fire brigade staff explained that burning 1 g polyurethane foam, can produce 0.008 gHCN, 0.21 gCO, if 500 kg of polyurethane foam accumulation after ignition, and water gun in this battle is not haven't water can all burnt out. "If choi steel structures, bunk house is on fire, the inside of the polyurethane foam fire outside the bread with the color steel plate, dozen don't go in the water at all." The fire is even more difficult.
Take any chances keen on gaining petty advantages pu problem
ZhiFu tuen mun road a decoration company boss tells a reporter, the polyurethane foam has been extensively used in building decoration materials, mainly because the domestic some building decoration enterprise value it more advantages, such as compared with similar products, its adornment effect is good, strong bonding, shockproof compressive, ultra-low temperature thermal conductivity, good sound insulation effect, etc.
Compared with a-class non-combustible rock wool insulation materials, polyurethane foam is cheaper, according to the construction site director Mr. Guo, if filled with polyurethane foam as the insulation material the color steel plate, one square metre cost is 300 yuan, if filled with rock wool, one square metre cost is 400 ~ 500 yuan. By using polyurethane foam insulation cost is low, many temporary houses to use with the filling, "many people feel that temporary accommodation houses live time is short, usually pay attention to some won't fire." Firefighters to explain, in addition to the advantages and cost factors, it is because of many entities fluky psychology, to cause the problem.