Birch Tar Oil, Rectified
Naturals Base Note CAS 8001-88-5
A powerful smoky note of burnt wood and tar with a distinct leathery character. Used in traces, it is the classic backbone of leather and smoky accords.
Odor profile
| Note | Base Note |
| Descriptor 1 | Woody |
| Descriptor 2 | Warm |
| Descriptor 3 | Smoky |
| Odor Impact1 | 1200 |
| Tenacity1 | 400 h |
1 Source: PerfumersWorld
Identification
| CAS Number | 8001-88-5 |
| INCI Name | Betula alba oil |
| Category | Naturals |
| Botanical Name | Betula pubescens Ehrh. |
Synonyms
Betula alba f. pubescens (Ehrh.) Bolzon, Betula alba subsp. alba L, Birch Tar Oil, Betula Pendula Roth Tar Oil, Birch tar oil (rectified), betula pendula roth essence, betula platyphylloides essence, betula procurva subsp. lipskyi essence, betula pseudopendula essence, betula talassica essence, betula verrucosa essence, Rectified birch tar oil, Dephenolated birch tar oil, Betula pendula rectified tar oil
Physical and chemical data
| Flash Point | 68 °C |
| Density | 1.030 to 1.149 |
| Refractive Index | 1.450 to 1.600 |
| Solubility | alcohol |
| Appearance | colorless to pale yellow clear liquid |
Regulatory status
IFRA maximum concentrations
| Category | Use | Limit in the finished product |
|---|---|---|
| Category 1 | Lip products, toys | Not restricted |
| Category 2 | Deodorants, antiperspirants | Not restricted |
| Category 3 | Eye products | Not restricted |
| Category 4 | Fine fragrance | Not restricted |
| Category 5A | Body lotion | Not restricted |
| Category 5B | Face cream | Not restricted |
| Category 5C | Hand cream | Not restricted |
| Category 5D | Baby creams, oils | Not restricted |
| Category 6 | Oral care, mouthwash | Not restricted |
| Category 7A | Rinse-off hair products | Not restricted |
| Category 7B | Leave-on hair products | Not restricted |
| Category 8 | Intimate and baby wipes | Not restricted |
| Category 9 | Soap, shampoo, rinse-off | Not restricted |
| Category 10A | Household care, hand contact | Not restricted |
| Category 10B | Aerosol air fresheners | Not restricted |
| Category 11A | Intended skin contact | Not restricted |
| Category 11B | Minimal skin contact | Not restricted |
| Category 12 | No skin contact, candles | Not restricted |
| IFRA Amendment | 47 |
| Restriction Type | Specification |
| Critical Effect | Carcinogenicity, Genotoxicity By Release Of Polynuclear Hydrocarbons (pah) |
| Specification | Only rectified (redistilled) oil manufactured under Good Manufacturing Practice may be used. The polycyclic aromatic hydrocarbons (PAH) benzo[a]pyrene and 1,2-benzanthracene must not exceed 1 ppb (0.0000001 %) in total in the finished product, counted together with any other PAH-bearing material (rectified Cade oil, rectified Birch tar oil, pyrogenic Styrax oil, Opoponax). The crude, unrectified pyrolysate is prohibited. |
Restricted components
| Component | Share |
|---|---|
| D-Limonene | 4.5 % |
| Isoeugenol | 4 % |
| Trans-Isoeugenol | 2.5 % |
| Eugenol | 1.5 % |
| 2-Methyl-2-Pentenal | 0.05 % |
IFRA regulated substances declared for this material. For naturals — which are mixtures of many molecules — the interactive index derives the effective maximum concentration per category from them. On single molecules these shares are purity traces from the supplier specification; they are far too small to limit use and are therefore not counted.
EU allergen declaration
| Substance | Share |
|---|---|
| Limonene | 4.5 % |
| Isoeugenol | 4 % |
| trans-Isoeugenol | 2.5 % |
| Eugenol | 1.5 % |
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.