PerfuMate › IFRA limits › Hydratropic Aldehyde
How much Hydratropic Aldehyde can you put in a perfume?
IFRA standard: 2-Phenylpropionaldehyde · Category 4, 51st Amendment
0.16%
of the finished perfume, at most
Under the IFRA Standards (51st Amendment, Category 4: fine fragrance on skin), Hydratropic Aldehyde may make up at most 0.16% of the finished perfume. In an eau de parfum at 18%, that is at most 0.888% of your concentrate: 0.888% 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 Hydratropic Aldehyde its concentrate can hold. If nothing else in the formula carries it:
| Perfume strength | Most Hydratropic Aldehyde in the concentrate |
|---|---|
| Cologne, 5% | 3.2% |
| Eau de toilette, 10% | 1.6% |
| 15% | 1.06% |
| Eau de parfum, 18% | 0.888% |
| 20% | 0.8% |
| Extrait, 25% | 0.64% |
Which materials contain Hydratropic Aldehyde?
Sold as Hydratropic Aldehyde itself, counted in full:
It also arrives inside other materials. The limit is on the total, so the calculator adds every source together. The largest carriers in PerfuMate's catalog, by their typical composition:
| Material | Typical content | Alone at 18%, at most |
|---|---|---|
| Hyacinth (F-TEC) | 4% | 22.2% of the concentrate |
| Hyacinth Body™ (IFF) | 3% | 29.6% of the concentrate |
Shares are the catalog's typical values. A real batch varies with origin and season, and your supplier's analysis (GC-MS or certificate of analysis) is the real figure.
A worked example
A 100 g concentrate, bottled as an eau de parfum at 18%:
| Material | Weighed |
|---|---|
| Hydratropic Aldehyde | 1.3 g |
| Ethylene Brassylate no IFRA limit | 98.7 g |
Hydratropic Aldehyde brings 0.234% Hydratropic Aldehyde to the finished perfume, against a limit of 0.16%: 1.46 times the limit. To bring it inside on its own, the calculator cuts Hydratropic Aldehyde from 1.3 g to 0.885 g. Or keep the formula and bottle it weaker: the highest strength inside every limit is 12.3%.
Or paste these lines into the calculator:
Hydratropic Aldehyde 1.3 g Ethylene Brassylate 98.7 g
Questions
Is Hydratropic Aldehyde banned in perfume?
No. IFRA restricts it: at most 0.16% of a fine fragrance (Category 4).
How much Hydratropic Aldehyde can I use in an eau de parfum?
At 18%, at most 0.888% of the concentrate, if nothing else in the formula carries Hydratropic Aldehyde. 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.