EPS foam is a thermoplastic material with 500-600 independent air-tight bubbles per cubic meter, containing more than 98% of the air volume. Because the thermal conductivity of air is very small, and it is closed in foam plastic and cannot convect, so EPS It is a very good insulation material. For example, steel structure workshops, cold storage, clean workshops, building layers, phenolic foam, etc. all have many excellent properties: the stable particle size change rate of phenolic foam is small, within the temperature range, the particle size change rate of phenolic foam is large, and has Uniform closed-cell structure, low thermal conductivity, good thermal insulation performance similar to polyurethane, better than polyvinyl alcohol foam, phenolic foam and good closed-cell structure. Low water absorption, strong moisture permeability, no condensation in cold storage. Phenolic foam can withstand almost all inorganic corrosion except for strong alkali corrosion. Phenolic molecules contain only carbon, hydrogen and oxygen atoms. Except for a small amount of C, there is no other toxic gas and smoke density. After the flame burns, a layer of foam packaging is formed on the surface to effectively protect the foam structure inside the layer. The flame penetration time can reach 1H. The application temperature range is wide, and buildings such as supermarkets need fire protection and heat preservation requirements. This is because the outstanding advantages of phenolic insulation boards are fire prevention and heat preservation.