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国家标准编号 国家标准名称GB/T4217-2001 流体输送用热塑性塑料管材公称外径 和公称压力GB/T6669-2001 软质泡沫聚合材料 压缩永久变形的测定GB/T6671-2001 热塑性塑料管材 纵向回缩率的测定GB/T6672-2001 塑料薄膜和薄片厚度测定 机械测量法GB/T6673-2001 塑料薄膜和薄片长度和宽度的测定
National Standard No. Name of national standard GB / T4217-2001 Thermoplastics pipe fluid delivery Nominal diameter and nominal pressure GB / T6669-2001 Determination of compression set of flexible foam polymer materials GB / T6671-2001 Longitudinal retraction of thermoplastic pipe Determination of GB / T6672-2001 plastic film and sheet thickness measurement of mechanical measurement GB / T6673-2001 Determination of plastic film and sheet length and width