Polystyrene foam (EPS) is made of polystyrene (1.5% -2%) and air (98% -98.5%), pentane as propellant gas to foam material. Have a wide density range, low prices, excellent insulation properties, low water absorption, low water vapor permeability, shock absorption and other good characteristics. Polystyrene foam board and composite materials because of its low price, good insulation properties, the thermal conductivity of less than 0.041W / (m? K), and become the preferred exterior wall insulation and finish systems insulation material .
The results found that the lower the average temperature is, the higher the percentage of energy-saving vacuum polystyrene foam, thermal insulation effect is better, the result is the insulation of refrigeration required. Meanwhile polystyrene foam is mainly composed of carbon and hydrogen two elements. This polymer began to degrade at a relatively low temperature (350 ?), chain scission, forming flammable monomers, dimers or other low molecular weight fragments. Therefore, it is necessary to add flame retardants to improve the properties of polystyrene foam flammable.
Due to its wide application, polystyrene recycling is hotter today.