Agent Name

2-Methylpropanoic acid

Alternative Name

Isobutyric acid

CAS Number

79-31-2

Formula

C4-H8-O2

Major Category

Other Classes

Synonyms

2-Methylpropionic acid; Acetic acid, dimethyl-; Cenex RP b2; Dimethylacetic acid; Isobutanoic acid; Isobutyric acid (natural); Isopropylformic acid; Kyselina isomaselna [Czech]; Propanoic acid, 2-methyl-; Propionic acid, 2-methyl-; Tenox IBP-2; Tenox IBP-2 Grain Pr.; alpha-Methylpropanoic acid; alpha-Methylpropionic acid; [ChemIDplus] UN2529

Category

Organic Acids

Description

Colorless liquid; [Hawley] Pungent odor, but not as unpleasant as butyric acid; [Merck Index]

Sources/Uses

Used to manufacture esters for flavors and perfumes; as a disinfecting agent; in varnish; for deliming hides; as a tanning agent; as starting material for diisopropyl ketone; as an herbicide; in the manufacture of salts used as textile chemicals, tanning compounds, stabilizers, catalysts, and preservatives; [HSDB] Occurs naturally in food (cheese, milk protein, vinegar, and beer) and in the body as a metabolic product; [CHEMINFO] Has been used as a lactation stimulant in dairy cattle; [REPROTOX]

Comments

A strong skin and eye irritant; Emergency treatment: irritants; [HSDB] A corrosive substance that can cause injury to the skin, eyes, and respiratory tract; [ICSC] A corrosive substance; Inhalation may cause chemical pneumonitis; Can be absorbed through skin; [MSDSonline]

Exposure Assessment
Vapor Pressure

1.81 mm Hg

Odor Threshold Low

8 ppm

Explanatory Notes

Flash point = 77 deg C; [Merck Index] Odor threshold from CHEMINFO;

Flammability (NFPA)

2: High ambient temperature required

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: