ISO 16589规定了使用密封元件的密封件，密封元件由基于热塑性材料（如聚四氟乙烯（PTFE））的适当配方化合物制成。它们被认为适合在低压条件下使用。 ISO 16589-5:2011对可能影响密封功能的典型表面缺陷进行了定义和分类，旨在方便采购商和制造商讨论这些缺陷在不同应用中的重要性。

ISO 16589 specifies seals utilizing sealing elements manufactured from suitably formulated compounds based on thermoplastic materials, such as polytetrafluoroethylene (PTFE). They are considered suitable for use under low-pressure conditions. ISO 16589-5:2011 defines and classifies typical surface imperfections that could impair the function of the seals, and is intended as a convenience for purchasers and manufacturers in their discussions concerning the importance of these imperfections in different applications.