Agent Name

2-Ethylhexanoic acid

Alternative Name

Butylethylacetic acid

CAS Number




Major Category

Other Classes


Butylethylacetic acid; 2-Butylbutanoic acid; 2-Ethylcaproic acid; 2-Ethylhexansaeure; 2-Ethylhexoic acid; 3-Heptanecarboxylic acid; Ethyl hexanoic acid; Ethylhexanoic acid; Ethylhexoic acid; Hexanoic acid, 2-ethyl-; Kyselina 2-ethylkapronova [Czech]; Kyselina heptan-3-karboxylova [Czech]; alpha-Ethylcaproic acid; [ChemIDplus]


Organic Acids


Clear liquid with a mild odor; [HSDB] Colorless to light yellow liquid; [CAMEO]


Used as a chemical intermediate for many products; Approximately 400 workers in US manufacturing are potentially exposed; Used in alkyd resins; Used in the mid-1980s as a wood preservative to replace chlorophenols; [ACGIH] Used to make plasticizers, lubricants, detergents, flotation aids, corrosion inhibitors, and alkyd resins; Also used as a co-solvent and defoamer in pesticides, as the active ingredient in the wood preservative Sinesto B (not used in the US), in paint dryers, heat stabilizers for PVC, and as a catalyst for polyurethane foaming, solvent extraction, and dye granulation; [HSDB] Not found in any pesticide products registered in the US; [NPRIS]


Corrosive to skin; [Quick CPC] High inhalation exposure can cause pulmonary edema; Causes liver changes in feeding studies of rats and mice; [HSDB] The TLV is based on teratogenic effects in animal studies. [ACGIH] May cause second-degree skin burns following short-term contact; Vapors cause severe eye and throat irritation (and possibly eye and lung injury) and are intolerable even at low concentrations; Inhalation may cause chemical pneumonitis and pulmonary edema; [CHRIS] A mild skin irritant; May cause severe eye and mucous membrane irritation; [Alfa Aesar MSDS]

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data


5 mg/m3, inhalable fraction and vapor

Vapor Pressure

0.03 mm Hg

Lethal Concentration

LC (rat) > 400 ppm/6hr

Explanatory Notes

Flash point = 118 deg C; [ACGIH]

Adverse Effects
Toxic Pneumonitis



Hepatotoxin, Secondary

Reproductive Toxin



Skin Burns

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

Search ChemIDplus

Biomedical References

Search PubMed

Related Information in HazMap

Industrial Processes with risk of exposure: