Cyclosia
Aroma Chemical Heart Note CAS 107-75-5
Sweet, delicate lily of the valley with a soft, fresh muguet and linden blossom character. A classic, gentle floral that builds muguet, lilac and light floral accords.
Odor profile
| Note | Heart Note |
| Descriptor 1 | Floral |
| Descriptor 2 | Muguet |
| Descriptor 3 | Aldehydic |
| Odor Impact1 | 25 |
| Impact Level | Medium |
| Tenacity1 | 40 h |
| Tenacity2 | 218 h |
1 Source: PerfumersWorld
2 Source: The Good Scents Company
Both tenacity figures are blotter life. The two labs use different evaluation protocols, so the numbers are not directly comparable — read them as two independent readings, not as a contradiction.
Identification
| CAS Number | 107-75-5 |
| INCI Name | Hydroxycitronellal |
| Category | Aroma Chemical |
| Formula | C10H20O2 |
| Mol. Weight | 172.26 |
| IUPAC Name | 7-hydroxy-3,7-dimethyloctanal |
| InChIKey | WPFVBOQKRVRMJB-UHFFFAOYSA-N |
Synonyms
Hydroxycitronellal, Dimethyl-7-hydroxy Octanal, Muguet, Cyclosia base, 7-hydroxy-3,7-dimethyl Octanal, 7-Hydroxy-3,7-dimethyloctan-1-al, 3,7-Dimethyl-7-hydroxyoctanal, Hydronal, Hydronyl, Hysimal, Laurinal, Laurine, Phixia, Fixol, Hylea coeur, Tilkul, Storine, Oxydihydrocitronellal, Muguettine Principe, Maial, Lily aldehyde, Hylea, Cyclo hydronal, Cyclodor, Cyclia, Cyclalia, Citronellal hydrate, Hycelea, Anthosal, Centaflor, Majal, Fixonal, Tilleul, Cyclohydron, citronellal, 7-hydroxy-, citronellaldehyde, cyclosia base (Firmenich), oxy dihydrocitronellal, hidroxycitronellal, hidroxycitronellal A
Physical and chemical data
| Boiling Point | 241.0 °C |
| Flash Point | 123.89 °C |
| Density | 0.918 |
| Refractive Index | 1.447 |
| Vapor Pressure | 0.003000 mmHg @ 25.00 C. (est) |
| LogP | 1.6 |
| Solubility | slightly soluble in water; soluble in alcohol, propylene glycol, and oils; insoluble in glycerol |
| Appearance | Liquid; Dry Powder; Liquid; CBI |
Regulatory status
IFRA maximum concentrations
| Category | Use | Limit in the finished product |
|---|---|---|
| Category 1 | Lip products, toys | 0.38 % |
| Category 2 | Deodorants, antiperspirants | 0.11 % |
| Category 3 | Eye products | 2.3 % |
| Category 4 | Fine fragrance | 2.1 % |
| Category 5A | Body lotion | 0.53 % |
| Category 5B | Face cream | 0.53 % |
| Category 5C | Hand cream | 0.53 % |
| Category 5D | Baby creams, oils | 0.18 % |
| Category 6 | Oral care, mouthwash | 1.2 % |
| Category 7A | Rinse-off hair products | 1.6 % |
| Category 7B | Leave-on hair products | 1.6 % |
| Category 8 | Intimate and baby wipes | 0.18 % |
| Category 9 | Soap, shampoo, rinse-off | 4.1 % |
| Category 10A | Household care, hand contact | 0.78 % |
| Category 10B | Aerosol air fresheners | 7.8 % |
| Category 11A | Intended skin contact | 0.18 % |
| Category 11B | Minimal skin contact | 0.18 % |
| Category 12 | No skin contact, candles | Not restricted |
| IFRA Amendment | 51 |
| Restriction Type | Restriction |
| Critical Effect | Dermal Sensitization And Systemic Toxicity |
Restricted components
| Component | Share |
|---|---|
| Citronellol | 0.2 % |
| Geraniol | 0.1 % |
| Citral | 0.1 % |
IFRA regulated substances contained in this material. The interactive index derives the effective maximum concentration per category from them.
EU allergen declaration
| Substance | Share |
|---|---|
| Citronellol | 0.2 % |
| Geraniol | 0.1 % |
| Citral | 0.1 % |
Substances that must be named in the ingredient list under Annex III of Regulation (EC) 1223/2009, as amended by Regulation (EU) 2023/1545. Where a range was given, the upper bound is shown.
All figures on this page are guide values collected from public reference works and supplier declarations. They differ between batches, origins and qualities. The data sheet of your own supplier is always the authoritative document for the material you actually use.