DIN EN ISO 11177:2019 搪瓷和搪瓷 用于未经处理和饮用水供应的内外搪瓷阀门和压力管件 质量要求和测试(ISO 11177:2019)
Vitreous and porcelain enamels - Inside and outside enamelled valves and pressure pipe fittings for untreated and potable water supply - Quality requirements and testing (ISO 11177:2019)