PerfuMate › IFRA limits › Acetyl hexamethyl indan
How much Acetyl hexamethyl indan can you put in a perfume?
IFRA standard: Acetyl hexamethyl indan (AHMI) · Category 4, 51st Amendment
2%
of the finished perfume, at most
Under the IFRA Standards (51st Amendment, Category 4: fine fragrance on skin), Acetyl hexamethyl indan may make up at most 2% of the finished perfume. In an eau de parfum at 18%, that is at most 11.1% of your concentrate: 11.1% of every 100 g.
What the limit means at your strength
The limit is on the finished perfume, so the stronger the perfume, the less Acetyl hexamethyl indan its concentrate can hold. If nothing else in the formula carries it:
| Perfume strength | Most Acetyl hexamethyl indan in the concentrate |
|---|---|
| Cologne, 5% | 40% |
| Eau de toilette, 10% | 20% |
| 15% | 13.3% |
| Eau de parfum, 18% | 11.1% |
| 20% | 10% |
| Extrait, 25% | 8% |
What the standard says
It is capped because it is phototoxic: on skin it can react with sunlight, so this limit is about sun exposure rather than allergy.
Which materials contain Acetyl hexamethyl indan?
Sold as Acetyl hexamethyl indan itself, counted in full:
A worked example
A 100 g concentrate, bottled as an eau de parfum at 18%:
| Material | Weighed |
|---|---|
| Phantolide | 17 g |
| Ethylene Brassylate no IFRA limit | 83 g |
Phantolide brings 3.06% Acetyl hexamethyl indan to the finished perfume, against a limit of 2%: 1.53 times the limit. To bring it inside on its own, the calculator cuts Phantolide from 17 g to 10.375 g. Or keep the formula and bottle it weaker: the highest strength inside every limit is 11.76%.
Or paste these lines into the calculator:
Phantolide 17 g Ethylene Brassylate 83 g
Questions
Is Acetyl hexamethyl indan banned in perfume?
No. IFRA restricts it: at most 2% of a fine fragrance (Category 4).
How much Acetyl hexamethyl indan can I use in an eau de parfum?
At 18%, at most 11.1% of the concentrate, if nothing else in the formula carries Acetyl hexamethyl indan. Every other source counts toward the same total.
Does this limit apply to candles or soap?
No. This is Category 4, fine fragrance on skin. Other products sit in other IFRA categories with other limits, which these pages and the calculator do not cover.