About this material
Aldehyde C8 occurs in several citrus oils including Orange oil.
It is a colourless liquid with a pungent odour, that becomes citrus like upon dilution.
C8 is used in perfumery in low concentrations, in eau de cologne and in artificial citrus oils.
Scent character
Highlights from the material’s listed odour profile.
Note position
Top note · Heart note
Material character
A closer lookOdour strength
Not listed
Tenacity / substantivity
Not listed
Fragrance development
Top note · Heart note
Illustrative note development · no measured evaporation data
Molecular identity
C8H16O
CAS-linked compound reference — Octanal
This compound record is linked to the explicitly recorded CAS number. It is not supplier confirmation of the supplied grade, purity, stereochemistry, isomer proportions or complete composition.
- Reference molecular weight
- 128.21 g/mol
- Reference IUPAC name
- octanal
More compound properties
Computed and structural reference properties for the named compound. These are not measured supplier specifications or properties of a complete dilution, mixture or batch.
- XLogP (computed)
- 2.7
- Exact mass (Da)
- 128.120115130
- Monoisotopic mass (Da)
- 128.120115130
- Topological polar surface area (Ų)
- 17.1
- Complexity
- 59
- Formal charge
- 0
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 1
- Rotatable bonds
- 6
- Heavy atoms
- 9
- Isotope atoms
- 0
- Atom stereocentres
- 0
- Bond stereocentres
- 0
- Covalent units
- 1
- SMILES
- CCCCCCCC=O
- InChI
- InChI=1S/C8H16O/c1-2-3-4-5-6-7-8-9/h8H,2-7H2,1H3
- InChIKey
- NUJGJRNETVAIRJ-UHFFFAOYSA-N
Reference data checked 2026-10-27.
CAS 124-13-0 · reference checked 2026-10-27.
Fragrance allergen reference
Generic regulatory reference only. This is not a supplier allergen declaration, measured composition, allergen-free claim or finished-product labelling assessment.
Raw-material reference based on recorded CAS numbers. A CAS match identifies a reference entry; it does not verify the supplied grade, composition, purity or finished-product compliance. Naturals, bases and mixtures require composition review.
European Union / Northern Ireland
No direct listed-entry CAS match in this jurisdiction’s held reference set. This does not mean the material is allergen-free. Constituents, grouped entries and natural-material composition may require further review.
Finished-cosmetic declaration thresholds: greater than 0.001% leave-on; greater than 0.01% rinse-off. Apply the current target-market rules to the actual complete formulation; no concentration is inferred here.
Commission Regulation (EU) 2023/1545 · Regulation (EU) 2023/1545 with 11 November 2025 corrigendum; checked 2026-10-26.
Held EU transition dates: placing noncompliant products on the market until 2026-07-31; making them available until 2028-07-31. Check applicability and current law for the intended market. 2025 corrigendum.
Great Britain
No direct listed-entry CAS match in this jurisdiction’s held reference set. This does not mean the material is allergen-free. Constituents, grouped entries and natural-material composition may require further review.
Finished-cosmetic declaration thresholds: greater than 0.001% leave-on; greater than 0.01% rinse-off. Apply the current target-market rules to the actual complete formulation; no concentration is inferred here.
Regulation (EC) No 1223/2009, Annex III (Great Britain) · legislation.gov.uk current text checked 2026-10-26.
Current supplier composition or allergen declarations are required to assess naturals, bases, mixtures and actual concentrations. Reference data checked 2026-10-26; bundle 2026-10-27. Supplementary private documents remain separate.
Product specification
| CAS number | 124-13-0 |
|---|---|
| Odour description (decreasing) | Aldehydic, Waxy, Citrus Orange with a Green Peely Nuance |
| Solvent | None |
| Physical state | Liquid |
| Synonyms | n-Caprylaldehyde, n-Octaldehyde, n-Octanal, n-Octylal, Antifoam-LF, Caprylaldehyde, Caprylic Aldehyde, Octaldehyde, Octanaldehyde, Octanoic Aldehyde, Octylaldehyde, 1-Octanal; n-Octyl Aldehyde, Aldehyde C-8; C-8 Aldehyde |
Safety & handling
Hazard statements:
- H226 Flammable liquid and vapour.
- H315 Causes skin irritation.
- H319 Causes serious eye irritation.
- H412 Harmful to aquatic life with long lasting effects.
Precautionary statements:
- P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
- P233 Keep container tightly closed.
- P240 Ground and bond container and receiving equipment.
- P273 Avoid release to the environment.
- P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water.
- P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Professional/Industrial use only.
Datasheets & customer documents
Available documents are attached to eligible completed orders in your account.
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Supplementary documents are supplied only where explicitly listed and available. Check documentation information
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Documentation Supply PolicyIFRA formulation guide
Generic reference only — not an IFRA certificate, compliance decision or use recommendation. The Responsible Person and qualified safety assessor must assess the actual finished formula using current applicable IFRA Standards, supplementary documentation where available and the CPSR.
Raw-material reference based on recorded CAS numbers. A CAS match identifies a reference entry; it does not verify the supplied grade, composition, purity or finished-product compliance. Naturals, bases and mixtures require composition review.
Source: 51st Amendment overview, held source checked 2026-10-21. Bundle 2026-10-27. Individual Standards prevail over the overview.
No direct IFRA overview entry matched the recorded CAS in this held dataset. This does not mean unrestricted use, absence of relevant Standards or compliance. Constituent restrictions may still apply.
IFRA source overview · Individual IFRA Standards and supplementary documentation
Supplier certificates and private documents are separate evidence. Their availability does not determine whether this generic guide is shown. This is a dated local reference, not a live regulatory feed.
Creative ideas to explore
Creative directions, not tested formulas.Polished petals
With rose and soft floral notesExplore an aldehydic floral silhouette around a simple rose accord. Compare the opening and later impression with an unchanged floral reference; decide whether the effect feels airy, waxy or abstract before adding further complexity.
Citrus in white
With bergamot and a musk directionBuild a study around citrus brightness and a restrained musk backdrop. Let the aldehydic material be the changing variable, then note whether it supports the peel impression or takes the sketch towards a more abstract clean accord.
A softer frame
With sandalwood and powdery notesSet the listed aldehydic character against a soft wood or powder direction. Compare the balance through the evaluation rather than judging only the first impression, and keep any successful version simple enough to understand what changed.








Ryan (verified owner) –
Spot on!