PerfuMate › IFRA limits › trans-2-Hexenal
How much trans-2-Hexenal can you put in a perfume?
IFRA standard: 2-Hexenal · Category 4, 51st Amendment
0.0077%
of the finished perfume, at most
Under the IFRA Standards (51st Amendment, Category 4: fine fragrance on skin), trans-2-Hexenal may make up at most 0.0077% of the finished perfume. In an eau de parfum at 18%, that is at most 0.0427% of your concentrate: 0.0427% 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 trans-2-Hexenal its concentrate can hold. If nothing else in the formula carries it:
| Perfume strength | Most trans-2-Hexenal in the concentrate |
|---|---|
| Cologne, 5% | 0.154% |
| Eau de toilette, 10% | 0.077% |
| 15% | 0.0513% |
| Eau de parfum, 18% | 0.0427% |
| 20% | 0.0385% |
| Extrait, 25% | 0.0308% |
Which materials contain trans-2-Hexenal?
Sold as trans-2-Hexenal 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 |
|---|---|---|
| Tomato Leaf Naturalnatural | 2% | 2.13% of the concentrate |
| Apple (F-TEC) | 0.0099% | no limit on its own |
| Honey Provence (Firmenich) | 0.0002% | no limit on its own |
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 |
|---|---|
| trans-2-Hexenal | 0.021 g |
| Tomato Leaf Natural | 1.3 g |
| Ethylene Brassylate no IFRA limit | 98.679 g |
trans-2-Hexenal alone brings 0.00378% trans-2-Hexenal to the finished perfume, and Tomato Leaf Natural adds 0.00468%. Each looks modest, but the perfume holds 0.00846% against a limit of 0.0077%: 1.1 times the limit. To bring it inside on its own, the calculator cuts trans-2-Hexenal from 0.021 g to 0.019 g and Tomato Leaf Natural from 1.3 g to 1.176 g. Or keep the formula and bottle it weaker: the highest strength inside every limit is 16.38%.
Or paste these lines into the calculator:
trans-2-Hexenal 0.021 g Tomato Leaf Natural 1.3 g Ethylene Brassylate 98.679 g
Questions
Is trans-2-Hexenal banned in perfume?
No. IFRA restricts it: at most 0.0077% of a fine fragrance (Category 4).
How much trans-2-Hexenal can I use in an eau de parfum?
At 18%, at most 0.0427% of the concentrate, if nothing else in the formula carries trans-2-Hexenal. Every other source counts toward the same total.
Does trans-2-Hexenal from essential oils count?
Yes. The limit is on the total in the finished perfume, whatever brings it: Tomato Leaf Natural typically carries 2%. The calculator adds every source.
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.