CAS 67-56-1: Methanol (CH4O)

Identity

CAS Number	67-56-1
Molecular Formula	CH4O
IUPAC Name	methanol
Molecular Weight	32.04 g/mol
SMILES	`CO`
Synonyms	methyl alcohol, wood alcohol, carbinol, MeOH

2D Structure

Physical Properties

Density	0.792 g/mL at 25°C
Boiling Point	64.7°C
Melting Point	-97.6°C
Flash Point	11°C
Vapor Pressure	16.9 kPa at 20°C
Refractive Index	nD = 1.329
Dielectric Constant	ε = 32.7

Safety & GHS Classification

FlammableGHS06Health Hazard

H225: Highly flammable liquid and vapor
H301: Toxic if swallowed
H311: Toxic in contact with skin
H331: Toxic if inhaled
H370: Causes damage to organs (eyes, central nervous system)

Storage: Store in cool, well-ventilated area away from ignition sources. Keep container tightly closed. Methanol is highly toxic — ingestion of as little as 10ml can cause permanent blindness. Use in well-ventilated space with proper respiratory protection per OSHA 29 CFR 1910.1000.