An organic peroxy acid used as an oxidising agent.
What it is
Phthalimidoperoxycaproic acid, often abbreviated PAP, is 1,3-dihydro-1,3-dioxo-2H-isoindole-2-hexaneperoxoic acid, an organic peroxy acid built from a phthalimide group and a six-carbon chain ending in a peroxy acid group. CosIng lists it as an oxidising ingredient.
Where it is used
Found in tooth whitening 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.
The INCI list does not show the concentration used.
Functions
- Oxidising
- Changing the chemical nature of another ingredient by adding oxygen (or removing hydrogen).
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.

