DIN 4753-5-1994 饮用水和服务性用水的热水器和水加热装置.第5部分:采用天然或合成橡胶制成的箔片涂层作触水面的防腐保护.要求和检验
Water heaters and water heating installations for drinking water and service water - Part 5: Corrosion protection on the water side by means of foil coating made from natural or synthetic rubber; requirements and testing