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美国屋面工程协会(NRCA)对用于屋面系统的聚苯乙烯保温产品的R值,进行了有限的测试,以确定实测值是否符合ASTM国际标准的认可值。按美国聚苯乙烯保温产品标准ASTM C578《硬质多孔聚苯乙烯保温材料标准技术规程》,美国
The American Roofing Association (NRCA) conducted a limited test of the R value of polystyrene insulation products used in roofing systems to determine if the measured values meet the approved values of ASTM international standards. According to the United States polystyrene insulation product standard ASTM C578 “rigid porous polystyrene insulation material standard technical regulations”, the United States