1,2-Butanediol

Description

1,2-Butanediol · CAS 26171-83-5 · C4H10O2. UNII RUN0H01QEU. Boiling Point: 195-196.9 °C; Boiling Point: 194 °C; Melting Point: -50 °C.

Identification

CAS Registry Number	26171-83-5
PubChem CID	11429
Molecular formula	C4H10O2
IUPAC name	butane-1,2-diol
UNII (FDA)	RUN0H01QEU

Computed Descriptors

Molecular Weight	90.12
XLogP3	-0.2
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	2
Exact Mass	90.068079557
Monoisotopic Mass	90.068079557
Topological Polar Surface Area	40.5
Heavy Atom Count	6
Formal Charge	0

Physical & Chemical Properties

Boiling Point	195-196.9 °C
Boiling Point	194 °C
Melting Point	-50 °C
Melting Point	-114 °C
Flash Point	90 °C
Flash Point	40 °C (104 °F) (CLOSED CUP)
Flash Point	93 °C c.c.
Density	1.0023 @ 20 °C
Vapor Density	3.1 (AIR= 1)
Vapor Pressure	0.05 [mmHg]

Physical description & handling notes

• Liquid; CBI
• Colorless, hygroscopic liquid; [CHEMINFO]
• COLOURLESS VISCOUS LIQUID.
• CLEAR VISCOUS LIQUID
• SPECIFIC OPTICAL ROTATION: -7.4 DEG AT 22 °C/D (ALCOHOL, 4%); SOL IN WATER, ALCOHOL & ACETONE /L-FORM/
• Miscible with water in all proportions, readily soluble in alcohols, slightly soluble in ethers and esters, and insoluble in hydrocarbons.

Regulatory Status

Regulatory & Food Contact	CIR / INCI: Cosmetic ingredients (1,2-Butanediol) -> CIR (Cosmetic Ingredient Review)
GHS notification summary	25.3% (39 / 154)

GHS Hazard Classification

GHS notification summary	25.3% (39 / 154)
Reported hazard statements	H319 (74.7%)

Documented Uses

• IN INDUST AS INTERMEDIATE IN POLYESTER RESINS
• EPA Safer Chemical Functional Use Classes -> Solvents
• Safer Chemical Classes -> Green circle - The chemical has been verified to be of low concern
• 1,2-BUTANEDIOL IS A RELATIVELY NEW PRODUCT & IS PRODUCED COMMERCIALLY BY HYDRATION OF CORRESPONDING 1,2-BUTYLENE OXIDE IN MANNER SIMILAR TO THAT DESCRIBED FOR OTHER SIMPLE GLYCOLS.
• (1977) MORE THAN 4.5X10+6 G (INCL 1,3-ISOMER)
• (1979) MORE THAN 4.5X10+6 G (INCL 1,3-ISOMER)

Synonyms

1,2-BUTANEDIOL; 584-03-2; butane-1,2-diol; 1,2-Butylene glycol; 1,2-Dihydroxybutane; alpha-Butylene glycol; alpha-Butyleneglycol; DTXSID6040375; RUN0H01QEU; NSC-24242; DTXCID4020375; CHEBI:52682; Massage Oil; RefChem:934958; 209-527-2; 26171-83-5

Frequently Asked Questions

What are the CAS number and molecular formula of 1,2-Butanediol?

CAS 26171-83-5; molecular formula C4H10O2; molecular weight — g/mol.

What other names is 1,2-Butanediol known by?

1,2-BUTANEDIOL, 584-03-2, butane-1,2-diol, 1,2-Butylene glycol, 1,2-Dihydroxybutane, alpha-Butylene glycol.

What is the regulatory status of 1,2-Butanediol?

Documented regulatory listings: CIR / INCI: Cosmetic ingredients (1,2-Butanediol) -> CIR (Cosmetic Ingredient Review).

Is 1,2-Butanediol classified as hazardous?

25.3% of GHS notifications report no hazard classification (39 of 154).

What are the key physical properties of 1,2-Butanediol?

Boiling Point: 195-196.9 °C; Boiling Point: 194 °C; Melting Point: -50 °C; Melting Point: -114 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.