Alpha Terpinene
Aroma Chemical Top Note CAS 99-86-5
A fresh terpenic note with a lemon citrus character and a soft woody herbal facet. Lively and natural, it adds freshness and a spicy lift to citrus and woody accords.
Odor profile
| Note | Top Note |
| Descriptor 1 | Citrus |
| Descriptor 2 | Lemon |
| Descriptor 3 | Herbal |
| Tenacity2 | 2 h |
2 Source: The Good Scents Company
Identification
| CAS Number | 99-86-5 |
| INCI Name | Alpha-terpinene |
| Category | Aroma Chemical |
| Formula | C10H16 |
| Mol. Weight | 136.23 |
| IUPAC Name | 1-methyl-4-propan-2-ylcyclohexa-1,3-diene |
| InChIKey | YHQGMYUVUMAZJR-UHFFFAOYSA-N |
Synonyms
P-mentha-1,3-diene, Alpha-Terpinene, Terpilene, 1-Isopropyl-4-methyl-1,3-cyclohexadiene, 1, 3-Cyclohexadiene, 1-methyl-4-(1-methylethyl)-, alpha-Terpinen, 1-methyl-4-propan-2-ylcyclohexa-1,3-diene, alphaTerpinene, 1-isopropyl-4-methylcyclohexa-1,3-diene, 1-Methyl-4-(1-methylethyl)-1,3-cyclohexadiene, 1-methyl-4-(propan-2-yl)cyclohexa-1,3-diene, a-terpinene, 1,3-cyclohexadiene, 1-methyl-4-isopropyl-, para-mentha-1,3-diene, 1,3-p-menthadiene, 1,3-para-menthadiene, 4-methyl-1-(1-methylethyl)-1,3-cyclohexadiene, 1-methyl-4-(1-methyl ethyl)-1,3-cyclohexadiene, 1-methyl-4-isopropyl-1,3-cyclohexadiene, 1-methyl-4-isopropylcyclohexadiene-1,3, 4-iso propyl-1-methyl-1,3-cyclohexadiene, 1-iso propyl-4-methyl cyclohexa-1,3-diene, 1-iso propyl-4-methyl-1,3-cyclohexadien, 1-iso propyl-4-methyl-1,3-cyclohexadiene, 1-iso propyl-4-methylcyclohexa-1,3-diene, alpha-terpinene natural, alpha-terpinene P&F
Physical and chemical data
| Boiling Point | 174.0 °C |
| Melting Point | 25.0 °C |
| Flash Point | 46.11 °C |
| Density | 0.833 |
| Refractive Index | 1.475 |
| Vapor Pressure | 1.638000 mmHg @ 25.00 C. (est) |
| LogP | 2.8 |
| Solubility | Insoluble in water; soluble in most fixed oils |
| Appearance | CBI; Liquid |
Regulatory status
Restricted components
| Component | Share |
|---|---|
| D-Limonene | 0.2 % |
IFRA regulated substances contained in this material. The interactive index derives the effective maximum concentration per category from them.
EU allergen declaration
| Substance | Share |
|---|---|
| Limonene | 0.2 % |
| Terpinolene | 0.035 % |
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.