2‑Ethylhexanoic Acid (Octoic Acid)

2‑Ethylhexanoic Acid (Octoic Acid)

CAS Number: 149‑57‑5

Synonyms: 2‑Ethylhexanoic acid; 2‑EHA; Octoic acid; 2‑Ethylcaproic acid

Chemical Formula:C₈H₁₆O₂

Product Introduction

A colorless to pale yellow viscous liquid with a mild odor. A branched monocarboxylic acid widely used to form lipophilic metal salts and esters with excellent thermal and hydrolytic stability.

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Physical & Chemical Properties

Property Value
Appearance Colorless to yellow viscous liquid
Odor Mild, slightly fatty
Density ~0.903 g/mL @ 25 °C
Melting Point ~–59 °C
Boiling Point ~228 °C
Flash Point ~114 °C closed cup
Vapor Pressure <0.01 hPa @ 20 °C
Solubility Slight in water; miscible with organics
Vapor Density ~5 × air

Applications

  • Production of metal octoates (e.g., cobalt, zinc, calcium) for paint driers and PVC stabilizers
  • Intermediate for alkyd resins, plasticizers, PVC stabilizers, synthetic lubricants, and automotive coolants
  • Used in cosmetic emollients, acid chlorides, and catalysts for polymerizations

Safety & Handling

  • Combustible liquid (flash point ~114 °C); keep away from ignition sources
  • Skin/eye irritant; may be harmful if swallowed—use gloves and goggles
  • Hazardous to aquatic life—prevent environmental release

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