How to detect insulation materials?

Buildings in the insulation coat is a good thing to both energy saving and environmental protection. However, lanzhou flammable combustible fire detachment in building exterior insulation materials found in the security check, check the 74 construction site, building 214, found HuoHuan 52, 30 without fire control examination and approval of the illegal behavior. Reporter survey found that the businessman in order to reduce the construction cost, extensive use of "the board" without flame retardant, pieces of combustible insulation board on the building of building outside wall, at the same time of energy-saving heat preservation buried under the safe hidden trouble.