CAS 80-62-6: Methyl Methacrylate (C5H8O2)

Identity

CAS Number	80-62-6
Molecular Formula	C5H8O2
IUPAC Name	methyl 2-methylprop-2-enoate
Molecular Weight	100.12 g/mol
SMILES	`CC(=C)C(=O)OC`
Synonyms	MMA, 2-methylacrylic acid methyl ester, methyl 2-methylacrylate, methacrylic acid methyl ester

2D Structure

Physical Properties

Density	0.944 g/mL at 25°C
Boiling Point	100.5°C
Melting Point	-48.0°C
Flash Point	10.0°C
Vapor Pressure	3.9 kPa at 20°C
Refractive Index	nD = 1.414
Dielectric Constant	ε = 6.5

Safety & GHS Classification

FlammableIrritantHealth Hazard

H225: Highly flammable liquid and vapor
H315: Causes skin irritation
H317: May cause allergic skin reaction
H319: Causes serious eye irritation
H335: May cause respiratory irritation

Storage: Store in cool, dark place away from ignition sources. MMA polymerizes exothermically — add inhibitor (MEHQ, 10-100 ppm). Monitor temperature and store below 30°C. Do not store in direct sunlight.