DANSK DS/EN ISO 11177:2019 搪瓷和瓷釉 用于未经处理和饮用水供应的内部和外部搪瓷阀门和压力管道配件 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)