1. Active substance: Active substance is the most important washing component in washing powder, which can reduce the surface tension, permeability, floating and solubilization of water, make dirt loose, fall off clothes and enter the water.
2. Free alkali and pH: alkalinity helps to improve the decontamination ability of washing powder, but too high will have adverse effects on human skin, which is limited by free alkali and pH in the washing powder standard.
3. Apparent density: Apparent density reflects the weight of unit volume, that is, the amount of substances contained in unit volume. It is worth noting that the apparent density of concentrated powder is twice that of ordinary powder.
4. Total phosphorus pentoxide: Washing powder is divided into phosphorus-containing washing powder (HL) and phosphorus-free washing powder (WL) according to the addition of builder. This index distinguishes between phosphorus-containing washing powder and phosphorus-free washing powder. According to the investigation results of 20 10 washing powder, the market of washing powder in China is mainly phosphorus-free products.
5. Specify the detergency of dirty cloth: the detergency of washing powder is the main performance index of washing powder. The national standard stipulates the standard soiled cloth, namely: carbon black soiled cloth JB-0 1, protein soiled cloth JB-02 and sebum soiled cloth JB-03. The comprehensive detergency of washing powder is measured and evaluated by the ratio of detergency of washing powder to standard washing powder (reference washing powder). The greater the decontamination rate, the better the washing effect.
It should be emphasized that the test concentration of concentrated washing powder is 0. 1%, and that of ordinary washing powder is 0.2%, that is, the dosage (weight) of concentrated washing powder is half that of ordinary washing powder. If the apparent density index is combined, the dosage (volume) of concentrated washing powder is one quarter of that of ordinary washing powder.