Product Description
Octanoic acid, also referred to as caprylic acid or n-caprylic acid, is a medium-chain fatty acid (MCFA) with an 8-carbon molecular backbone.
It is recognized as a vital fatty acid that supports normal human physiological functions. Sufficient intake is required to maintain regular bodily processes, whereas insufficient levels may lead to impaired memory and concentration.
Chemical Properties
| Melting point | 16 °C |
| Boiling point | 237 °C(lit.) |
| Density | 0.91 g/mL at 25 °C(lit.) |
| Vapor density | 5 (vs air) |
| Vapor pressure | 1 mm Hg ( 78 °C) |
| Refractive index | n20/D 1.428(lit.) |
| FEMA | 2799 | OCTANOIC ACID |
| Fp | >230 °F |
| Storage temp | 20-25°C |
| Solubility | 0.68g/l |
| Pka | 4.89(at 25℃) |
| Form | Liquid |
| Specific Gravity | 0.910 (20/4℃) |
| Color | Clear colorless to yellow |
| PH | 3.97(1 mM solution);3.45(10 mM solution);2.95(100 mM solution); |
| Odor | unpleasant odor |
| PH Range | 3.5 |
| Odor Type | fatty |
| Explosive limit | 1%(V) |
| Water Solubility | 0.68 g/L (20 ºC) |
| Merck | 141765 |
| JECFA Number | 99 |
| BRN | 1747180 |
| Dielectric constant | 3.2 |
| Dielectric constant | 3.2（18℃） |
| Stability | Stable. Incompatible with bases, reducing agents, oxidizing agents. Flammable. |
| LogP | 3.05 at 20℃ |
| CAS DataBase Reference | 124-07-2(CAS DataBase Reference) |
| NIST Chemistry Reference | Octanoic acid(124-07-2) |
| EPA Substance Registry System | Octanoic acid (124-07-2) |
Safety Information
| Hazard Codes | C,Xi |
| Risk Statements | 34 |
| Safety Statements | 26-36/39-45-36/37/39-25-27 |
| RIDADR | UN 3265 8/PG 3 |
| WGK Germany | 1 |
| RTECS | RH0175000 |
| Autoignition Temperature | >300 °C |
| Hazard Note | Irritant |
| TSCA | Yes |
| HS Code | 2915 90 70 |
| HazardClass | 8 |
| PackingGroup | III |
| Hazardous Substances Data | 124-07-2(Hazardous Substances Data) |
| Toxicity | LD50 orally in rats: 10,080 mg/kg (Jenner) |
Product Application
Octanoic acid finds applications in specialty industrial and agricultural formulations.
For wheat spider control preparations, n-octanoic acid acts as a synergistic ingredient alongside trimethylolpropane ester, with a total additive dosage of 7–9 parts. The optimal weight ratio of trimethylolpropane ester to n-octanoic acid is 6–8:1, which delivers superior pest-control efficacy. This blend can be further processed into dedicated pesticide products targeting wheat spiders.
In anticorrosion and antirust fluids, n-octanoic acid is compounded with boric acid as a synergistic component, also at a total dosage of 7–9 parts. The preferred weight ratio of boric acid to n-octanoic acid is 6–8:1; formulations within this ratio range exhibit outstanding rust-proofing and anticorrosive properties, achieving peak performance.
