An ammonium salt of phosphoric acid, used as a buffering and oral care ingredient.
What it is
Diammonium phosphate is diammonium hydrogen orthophosphate, an inorganic salt of phosphoric acid and ammonia. CosIng lists it as an anticorrosive, buffering and oral care ingredient.
Where it is used
Appears on the ingredient lists of a small number of products.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
Functions
- Anticorrosive
- Preventing and or inhibiting the corrosion of the packaging material.
- Buffering
- Stabilising the pH of an aqueous medium in a narrow range even if an acid or base is added. Altering and/or maintaining a cosmetic product's pH at the desired level.
- Oral care
- Providing cosmetic effects to the oral cavity, e.g. cleansing, deodorising, protecting.
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

