[Haichuan 119] Do you know the fire protection level of exterior insulation materials?

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In recent years, we often see news about exterior wall insulation materials catching fire. What materials are used for these exterior wall insulation materials? And why the fire? According to our country * * The standard "Combustion Performance Classification of Building Materials and Products GB 8624-2012" divides the combustion performance of building materials into the following levels: Class A: non-combustible building materials: Materials that hardly burn. Level B1: Flame retardant building materials: Flame-retardant materials have better flame retardant effects. It is difficult to catch fire when exposed to open flames or high temperatures in the air. It is not easy to spread quickly and will stop burning immediately when the fire source is removed. Level B2: flammable building materials: Combustible materials have a certain flame retardant effect. If exposed to open fire or high temperature in the air, it will immediately catch fire and burn, easily leading to the spread of fire, such as wooden pillars, wooden roof trusses, wooden beams, wooden stairs, etc. Level B3: Flammable building materials: It has no flame retardant effect, is extremely flammable and poses a great fire risk. Exterior wall insulation materials can be divided into: 1. Insulation materials with Class A combustion performance: Rock wool, glass wool, foam glass, foam ceramics, foam cement, closed-cell perlite, etc., the most commonly used for exterior and external insulation is rock wool, and there are currently no good substitutes. 2. Insulation materials with B1 combustion performance: Specially treated extruded polystyrene board (XPS)/specially treated polyurethane (PU), phenolic, rubber powder polystyrene pellets, etc. Remember that this is a specially treated extruded polystyrene board. Ordinary extruded board cannot reach B1 level. 3. Insulation materials with combustion performance of B2 level: Molded polystyrene board (EPS), extruded polystyrene board (XPS), polyurethane (PU), polyethylene (PE), etc. Molded polystyrene board is what we often call foam board.