China started late insulation materials market, especially the market development of organic insulating material is lagging behind. Over the past decade, the state actively promote the development of energy-efficient buildings, reduce energy consumption, so that the expanded polystyrene plastered exterior insulation technology has been widely used for thermal insulation molded polystyrene foam (hereinafter referred to as EPS) constant demand increased EPS production led to the rapid development of enterprises.
Styrofoam is a polystyrene resin as the main body, adding a foaming agent and other additives, it is currently the most widely used as a buffer material. Chinese polystyrene foam production is concentrated in the Northeast, Jiangsu, Zhejiang and Beijing, Tianjin, Hebei, and in which small and medium enterprises as much. 2007,2008,2010,2011,2012 five years were molded polystyrene insulation with a national sampling, product qualification rate oversight foam were 95.1%, 96.3%, 97.5%, 97.5%, 97.8%. Product quality steadily, but there are still some problems. The main problem focused on the apparent density, the oxygen index, combustion grading. The spot checks found Hongshan District of Wuhan City Xingda insulation plant a batch apparent density project failed.
When insufficient density polystyrene foam board, if used for building exterior insulation will result in lower tensile strength, thermal insulation systems can not meet its own weight and finishes load bearing shear strength requirements, easy to make EPS board Central pulled off; while insufficient EPS insulation board density will result in reduced performance, moisture absorption increases affect the building insulation effect, polystyrene foam board insulation will not achieve the role of building energy efficiency.
At present, approximately 2000 EPS manufacturers, polystyrene foam production momentum is good, quality continues to improve. But a small number of large enterprises. It is reported that the apparent density refers to the mass per unit volume of the foam at a predetermined temperature and relative humidity conditions. Apparent density to a certain extent affect other physical performance and direct response costs.