ISO 28721-5:2016建立了化学品和容器搪瓷缺陷编目系统。此外，它还描述了一些类型的缺陷处理区域，这些区域很容易与搪瓷缺陷混淆。它有助于在搪瓷缺陷的指定和表征方面使用一致的语言。 ISO 28721-5:2016仅限于可检测缺陷，并不打算充分考虑所有出现的缺陷类型。它不评估搪瓷缺陷；进行的分类基于经验，并尽可能符合ISO 28721-1。 注:关于工艺工程中使用的搪玻璃设备的验收，ISO 28721-1适用。

ISO 28721-5:2016 establishes a system for the cataloguing of defects in enamellings for chemical service and vessels. In addition, it describes some types of areas in which defects have been treated and which can easily be confounded with enamelling defects. It serves for a consistent language use concerning the designation and characterization of enamelling defects. ISO 28721-5:2016 is limited to detectable defects and does not purport to fully take into consideration all occurring types of defects. It does not evaluate enamelling defects; the classification carried out is based on experience and corresponds, as far as possible, to ISO 28721-1. NOTE Regarding the acceptance of glass lined equipment for use in process engineering, ISO 28721-1 applies.