Short answer
Benzyl benzoate is a nearly odorless, slightly balsamic liquid used in perfumery mainly as a solvent: it dissolves resinoids, crystalline musks and other solids, and many purchased fragrance oils and natural extracts already contain it as a carrier. It occurs naturally in Peru and tolu balsams, ylang-ylang and other flowers. It is one of the original 26 EU fragrance allergens, so unlike DPG or IPM it must be declared on cosmetic labels above the thresholds — a reason to know exactly how much of it is hiding in your materials.
What it is used for
- Solvent. It dissolves many materials that are awkward in ethanol or DPG: resinoids such as benzoin and labdanum, crystalline materials such as some musks and coumarin, and viscous absolutes (dissolving solid aroma chemicals).
- Carrier in purchased materials. Resinoids and some absolutes are sold "in benzyl benzoate"; some fragrance oils use it as a diluent (fragrance oils diluted in a carrier).
- Blender and "fixative". Its very slow evaporation and faint balsamic note can smooth a base; whether it fixes anything is debated (perfume fixatives).
Solvents compared
| Solvent | Odor | Dissolves | EU declarable allergen? |
|---|---|---|---|
| Benzyl benzoate | Very faint, balsamic | Resinoids, crystals, absolutes — very good | Yes (original 26) |
| Dipropylene glycol (DPG) | Practically none | Most aroma chemicals; less good for resins | No |
| Isopropyl myristate (IPM) | Practically none | Oily materials; poor for some crystals | No |
| Triethyl citrate (TEC) | Practically none | Many materials; often chosen for "natural-friendly" ranges | No |
| Ethanol | Alcoholic, evaporates | Most materials; resins can haze | No |
"No" means the solvent itself is not on the EU's list of named fragrance allergens; its other properties still need checking. How solvents are counted in a formula is explained in absolute vs relative percentage.
The labeling consequence
Because benzyl benzoate is a named allergen, using it as a solvent can put a name on your label that the scent itself did not need. A worked example, by weight, with invented figures:
- A concentrate contains 6 g of labdanum resinoid supplied as 50% in benzyl benzoate per 100 g of concentrate — so 3 g of benzyl benzoate per 100 g.
- The eau de parfum is 15% concentrate, so benzyl benzoate is 3 × 15 ÷ 100 = 0.45% of the product.
- That is far above 0.001%, the EU threshold for leave-on products, so it must be named in the ingredient list — in addition to any benzyl benzoate the natural materials already contain.
Choosing materials supplied in DPG or another solvent, or making your own dilutions in a non-allergen solvent, keeps it off the label where that matters to you; see reducing declarable fragrance allergens.
Handling
- Benzyl benzoate solidifies a little below normal room temperature; in a cold lab it may crystallize in the bottle. Warm gently and mix before weighing.
- It does not evaporate from a blotter in any useful time, so a blotter of a material in benzyl benzoate stays oily; judge the material, not the residue.
Restrictions and records
- Declare it under EU, GB and other allergen rules where it exceeds the thresholds (fragrance allergens list, EU fragrance allergen labeling).
- Check whether any IFRA Standard applies to it in your category, and the supplier's certificate.
- On every material record that contains it as a solvent, record the percentage; a where-used search can then total it across formulas (find formulas using a material).
Solvents and carriers are part of the palette map in the guide to perfume materials by odor family.
Frequently asked questions
Is benzyl benzoate a fixative?
It evaporates very slowly and blends a base, which is why it was long called one. Whether it measurably slows the evaporation of other materials is not established; treat it as a solvent and blender.
Why is benzyl benzoate on my label when I never added it?
It came in with a resinoid, absolute or fragrance oil that uses it as a carrier, or from naturals that contain it. The supplier's composition statement tells you how much.
Can I replace it with DPG?
For many materials, yes. For some resins and crystals DPG dissolves less; test clarity cold before switching.
Written and reviewed by the RUŌOD Lab team. This article is general education about perfume formulation and record-keeping; it is not legal, regulatory or safety advice, and the examples are illustrations, not validated commercial formulas. How we write and check these guides.