The document specifies a test method for the determination of foaming power of surface active agents diluted in water with different degree of calcium hardness and a content of surface active agent less than or equal to 1 % (m/m).
DIN EN 12728:2000 history
2000DIN EN 12728:2000 Surface active agents - Determination of foaming power - Perforated disc beating method; German version EN 12728:1999