ISO 6993-3:2006给出了由高抗冲击聚氯乙烯（PVC-HI）制成的全端耐负载配件和鞍座的要求，这些配件和鞍座用于通过工作温度范围为0摄氏度（含+30摄氏度）和最大工作压力为1巴（100千帕）的埋地管道供应气体燃料。 仅适用于由高抗冲PVC材料PVC-A、PVC-CPE和PVC-EPR制造的配件和鞍座。它适用于带有弹性密封件和溶剂型水泥的接头。配件和鞍座适用于不含潜在有害成分的气体，其浓度会损害配件/鞍座材料的性能。

ISO 6993-3:2006 gives the requirements for full-end load-resistant fittings and saddles made of high-impact poly(vinyl chloride) (PVC-HI) intended to be used for the supply of gaseous fuels through buried pipelines having an operating temperature range of 0 degrees Celsius up to and including +30 degrees Celsius and a maximum operating pressure of 1 bar (100 kPa). It is applicable only to fittings and saddles manufactured from the high-impact PVC materials PVC-A, PVC-CPE and PVC-EPR. It is applicable to joints with elastomeric sealing elements and of the solvent cement type. The fittings and saddles are suitable for those gases not containing potentially damaging components in such concentrations as to impair the properties of the fitting/saddle material.