Alcohols & Glycols
REACH
2-methyl-1-butanol
CAS Number
137-32-6
EC Number
205-289-9
FEMA Number
FEMA 3998
What is 2-methyl-1-butanol?
2-Methyl-1-butanol (CAS 137-32-6), also known as primary active amyl alcohol, is a chiral aliphatic alcohol. FEMA 3998.
Where is 2-methyl-1-butanol used?
- Food and beverage: flavoring ingredient contributing to fruit and fermented flavor profiles
- Cosmetics: solvent and co-solvent in fragrance compounds and hair care formulations
- Topical preparations: controlled evaporation and carrier performance
- Polymer and plastics processing: reactive intermediate for plasticizers, resins and cross-linking agents
- It also serves as a precursor to amyl esters such as amyl acetate.
Good to know: Food-grade material meeting FCC specifications is available for flavor applications; technical-grade is supplied for industrial and polymer end uses where specific regulatory standards are not required.
Commercial specifications
- Purity typically 98% upward depending on application
- Clear liquid in drums and IBC containers
- Safety data sheets and certificates of analysis provided for every batch
Other Names (Synonyms)
sec-butylcarbinol|primary active amyl alcohol|methyl-2-butan-1-ol|L-2-Methyl-1-butanol|DL-sec-butyl carbinol|DL-2-METHYL-1-BUTANOL, PRACT|DL-2-Methyl-1-butanol|D-2-METHYL-1-BUTANOL
What are the physical properties of 2-methyl-1-butanol?
Melting Point -70 °C
Boiling Point 128 °C @ Press: 760 Torr
Density 0.816 g/cm³ @ Temp: 20 °C
Flash Point 110 °F
Appearance Amyl alcohols (pentanols) have eight isomers. All are flammable, colorless liquids, except the isomer 2,2- dimethyl-1-propanol, which is a crystalline solid.
Color Clear colorless to very slightly yellow
Odor at 100.00 %. ethereal fusel alcoholic fatty greasy winey whiskey leathery cocoa
Form Liquid
Water Solubility 3.6 g/100 mL (30 ºC)
Vapor Pressure 3 mm Hg ( 20 °C)
Refractive Index n 20/D 1.411
pH 7 (H2O)
Log P 1.22
How is 2-methyl-1-butanol classified and handled safely? Learn More
Danger
GHS02· Flammable GHS05· Corrosive GHS07· Irritant
Hazard Statements
H226 Flammable liquid and vapor [Warning Flammable liquids]
H315 (97.4%): Causes skin irritation [Warning Skin corrosion/irritation]
H318 (97.4%): Causes serious eye damage [Danger Serious eye damage/eye irritation]
H319 Causes serious eye irritation [Warning Serious eye damage/eye irritation]
H332 (97.4%): Harmful if inhaled [Warning Acute toxicity, inhalation]
H335 (99.7%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
Which trade and regulatory codes apply to 2-methyl-1-butanol?
HS Code 29051500
UN Number 1105
ADR Class 3
Packing Group III
Storage Class 3 - Flammable liquids
WGK (Germany) 3