DIN EN ISO 28721-2:2016
搪玻璃釉.加工厂用搪玻璃仪器.第2部分:耐化学侵蚀和热冲击的标识与规范(ISO 28721-2-2015);德文版本EN ISO 28721-2-2015
Vitreous and porcelain enamels - Glass-lined apparatus for process plants - Part 2: Designation and specification of resistance to chemical attack and thermal shock (ISO 28721-2:2015); German version EN ISO 28721-2:2015