Product Name

  • Name

    Naphthenic acid

  • EINECS 215-662-8
  • CAS No. 1338-24-5
  • Density 0.972 g/cm3
  • Solubility insoluble in water
  • Melting Point
  • Formula C10H18O2
  • Boiling Point 268.2 °C at 760 mmHg
  • Molecular Weight 170.2487
  • Flash Point 127.4 °C
  • Transport Information UN 3082 9/PG 3
  • Appearance clear yellowish to brown viscous liquid
  • Safety 26-36-61
  • Risk Codes 36/37/38-51/53
  • Molecular Structure Molecular Structure of 1338-24-5 (Naphthenic acid)
  • Hazard Symbols IrritantXi,HarmfulXn
  • Synonyms Acidol(petroleum by-product);Carboxylic acids, naphthenic;ISAN 185;NA 165;NA 200(acid);NS 130;NS 160;NY 160;NY 200;SNA 180;SNA 185;SP230;Sunaptic B;Tensioactiv N;
  • PSA 37.30000
  • LogP 1.42730

Naphthenic acid Chemical Properties


IUPAC Name: 3-(3-Ethylcyclopentyl)propanoic acid 
Empirical Formula: C10H18O2
Molecular Weight: 170.2487
Canonical SMILES: CCC1CCC(C1)CCC(=O)O
InChI: InChI=1S/C10H18O2/c1-2-8-3-4-9(7-8)5-6-10(11)12/h8-9H,2-7H2,1H3,(H,11,12)
InChIKey: WVRFSLWCFASCIS-UHFFFAOYSA-N
Index of Refraction: 1.459
Molar Refractivity: 47.9 cm3
Molar Volume: 174.9 cm3
Surface Tension: 36.4 dyne/cm
Density: 0.972 g/cm3
Flash Point: 127.4 °C
Enthalpy of Vaporization: 55.73 kJ/mol
Boiling Point: 268.2 °C at 760 mmHg
Vapour Pressure: 0.00223 mmHg at 25 °C 
FreezingPoint -30 - -36 °C  
EINECS: 215-662-8
Classification Code of Naphthenic acid (CAS NO.1338-24-5): TSCA UVCB

Naphthenic acid Uses

 Naphthenic acid is a complex of carboxylic acids.It is used in deicing, dust control, wood preservative and road stabilization. It's industrial applications include the production of metallic naphthenates, synthetic detergents and as a solvents. as a lubricant, Corrosion inhibitor and fuel additive.

Naphthenic acid Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rat LD50 intraperitoneal 640mg/kg (640mg/kg) BEHAVIORAL: FOOD INTAKE (ANIMAL)

GASTROINTESTINAL: PERITONITIS
AMA Archives of Industrial Health. Vol. 12, Pg. 477, 1955.
rat LD50 oral 3gm/kg (3000mg/kg) BEHAVIORAL: FOOD INTAKE (ANIMAL)

GASTROINTESTINAL: "HYPERMOTILITY, DIARRHEA"

GASTROINTESTINAL: OTHER CHANGES
AMA Archives of Industrial

Naphthenic acid Consensus Reports

Reported in EPA TSCA Inventory.

Naphthenic acid Safety Profile

Moderately toxic by ingestion and intraperitoneal routes. When heated to decomposition it emits acrid smoke and irritating fumes.
Hazard Codes: IrritantXi,DangerousN
Risk Statements: 36/37/38-51/53 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 26-36-61 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
RIDADR: UN 3082 9/PG 3
WGK Germany :2
RTECS: QK8750000

Naphthenic acid Specification

 Naphthenic acid (CAS NO.1338-24-5), its Synonyms are Acide naphtenique ; Agenap ; Carboxylic acids, naphthenic ; Sunaptic acid B ; Sunaptic acid C ; Naphthenic acids  . It is a dark colored liquid with an offensive odor .

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