Organic Acids
REACH
Isobutyric acid
CAS Number
79-31-2
EC Number
201-195-7
FEMA Number
FEMA 2222
What is Isobutyric acid?
Isobutyric acid (CAS 79-31-2), also known as isobutanoic acid, is a short-chain branched carboxylic acid. FEMA 2222.
Where is Isobutyric acid used?
- Chemical intermediate and flavoring agent
- Flavor and fragrance: precursor to isobutyrate esters that deliver fruity, cheesy and buttery notes in food products and perfumery
- Pharmaceutical manufacturing: synthetic intermediate for active ingredients and excipients
- Personal care: isobutyrate derivatives contribute fragrance profiles in lotions and shampoos
- It also acts as a catalyst precursor and pH-adjusting agent in specialty chemical synthesis and fermentation.
Good to know: Food-grade material meets FCC specifications; technical-grade material is for industrial synthesis and non-food uses.
Commercial specifications
- Drum, IBC and bulk quantities
Other Names (Synonyms)
isopropylformic acid|isobutanoic acid|iso-C3H7COOH|i-butyric acid|alpha-methylpropionic acid|alpha-methylpropanoic acid|alpha-isobutyric acid|a-methylpropionic acid
What are the physical properties of Isobutyric acid?
Melting Point -47 °C
Boiling Point 152-155 °C @ Press: 760 Torr
Density 0.950 g/cm³ @ Temp: 20 °C
Flash Point 132 °F
Appearance clear colourless liquid
Color Clear colorless
Odor at 1.00 % in propylene glycol. acidic sour cheese dairy buttery rancid
Form Liquid
Water Solubility 210 g/L (20 ºC)
Vapor Pressure 1.5 mm Hg ( 20 °C)
Refractive Index n 20/D 1.393(lit.)
pH 2.3 (500g/l, H2O, 25℃)
Log P 1.1 at 25℃
How is Isobutyric acid classified and handled safely? Learn More
Warning
GHS07· Irritant GHS02· Flammable GHS05· Corrosive GHS06· Toxic
Hazard Statements
H226 Flammable liquid and vapor
H301 Toxic if swallowed
H302 Harmful if swallowed
H311 Toxic in contact with skin
Precautionary Statements
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P240 Ground and bond container and receiving equipment.
P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment.
Which trade and regulatory codes apply to Isobutyric acid?
HS Code 29156000
UN Number 2529
ADR Class 3
Packing Group III
Storage Class 3 - Flammable liquids
WGK (Germany) 1