First, the fire resistance of the building is poor and easy to collapse. Most color steel plate buildings use steel structure, which is heavy. In case of fire, the fire temperature can reach 800 ~ 1000 ℃, far exceeding the critical temperature of 500 ℃ when the steel structure loses its static equilibrium stability. In the case of bearing load, the exposed steel structure will soon appear deformation, resulting in local damage, resulting in the overall collapse of the building. The ordinary color steel plate house will lose its bearing capacity and collapse about 10 minutes after the fire, which is not conducive to personnel evacuation and rescue materials.

二是板芯材料易点燃，蔓延迅速。彩钢板的板芯填充材料多数为聚氨酯、聚苯乙烯等易燃可燃材料，燃点低、阻燃性差，一旦遇到高温火花、电线短路熔珠或明火作用会立刻燃烧，且材料的蜂窝状结构会加大与空气的接触面，导致燃烧猛烈。此类建筑往往空间大，缺少防火分隔设施，在火灾时蔓延途径多，火势发展迅猛，易形成大面积燃烧和立体燃烧。

Second, the core material is easy to ignite and spread rapidly. Most of the core filling materials of color steel plate are flammable materials such as polyurethane and polystyrene, which have low ignition point and poor flame retardancy. Once encountering high temperature spark, wire short circuit, molten bead or open fire, they will burn immediately, and the honeycomb structure of the material will increase the contact surface with the air, leading to fierce combustion. This kind of building is often large space, lack of fire separation facilities, when the fire spread in many ways, the rapid development of fire, easy to form a large area of combustion and three-dimensional combustion.

三是建筑内通道狭窄，影响疏散。很多使用单位为了追求使用面积，没有留出符合规范要求的安 全通道和疏散空间，有些甚占用安 全疏散通道搭建彩钢房，一旦发生火灾，人员疏散受阻，后果不堪设想。

Thirdly, the narrow passageway in the building affects the evacuation. In order to pursue the use area, many users do not set aside the safety passage and evacuation space in line with the requirements of the specification. Some even occupy the safety evacuation passage to build color steel rooms. In case of fire, the evacuation is blocked, and the consequences are unimaginable.

四是燃烧产物毒性大，逃生困难。彩钢板板芯填充物采用的聚苯乙烯和聚氨酯为高分子聚合材料，燃烧会产生大量浓烟，含有大量一氧化碳和氰化氢等有毒气体，具有很强的毒性和刺激性，容易造成火场逃生人员和消防扑救人员的伤亡事故。

Fourth, combustion products are highly toxic and difficult to escape. Polystyrene and polyurethane are used as polymer materials in the core filler of color steel plate, which will produce a lot of smoke when burning. It contains a lot of toxic gases such as carbon monoxide and hydrogen cyanide, which has strong toxicity and irritation, and is easy to cause casualties of fire escape personnel and fire fighting personnel.

五是火场不利因素多，扑救困难。彩钢建筑火灾在扑救过程中，水和灭火剂只能喷到彩钢板外层板面上，不能直接作用于夹层里的燃烧物。

Fifthly, there are many disadvantageous factors and it is difficult to put out the fire. In the fire fighting process of color steel building, water and fire extinguishing agent can only be sprayed on the outer surface of color steel plate, and can not directly act on the combustibles in the interlayer.