CAS 584-84-9: TDI (Toluene Diisocyanate) (C9H6N2O2)

Identity

CAS Number	584-84-9
Molecular Formula	C9H6N2O2
IUPAC Name	2,4-diisocyanato-1-methylbenzene
Molecular Weight	174.16 g/mol
SMILES	`Cc1ccc(cc1N=C=O)N=C=O`
Synonyms	tolylene diisocyanate, 2,4-TDI, toluene-2,4-diisocyanate

2D Structure

Physical Properties

Density	1.224 g/mL at 25°C
Boiling Point	251.0°C
Melting Point	21.5°C
Flash Point	132.0°C
Vapor Pressure	0.003 kPa at 20°C
Refractive Index	nD = 1.569
Dielectric Constant	ε = 8.5

Safety & GHS Classification

GHS05GHS06IrritantHealth Hazard

H301: Toxic if swallowed
H315: Causes skin irritation
H317: May cause an allergic skin reaction
H319: Causes serious eye irritation
H330: Fatal if inhaled
H334: May cause allergy or asthma symptoms or breathing difficulties if inhaled
H335: May cause respiratory irritation
H351: Suspected of causing cancer
H412: Harmful to aquatic life with long lasting effects

Storage: EXTREME HAZARD — store in tightly sealed containers under nitrogen. Fatal if inhaled — respiratory sensitizer. Reacts violently with water, alcohols, and amines. Use only in enclosed systems with proper ventilation and PPE.