Hydroquinone

Catalog	ACM123319
CAS	123-31-9
Structure
Category	Environmental Standards
Description	Hydroquinone, also benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C6H4(OH)2. Its chemical structure, shown in the table at right, features two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid. Substituted derivatives of this parent compound are also referred to as hydroquinones. The name “hydroquinone” was coined by Friedrich Wöhler in 1843.
Synonyms	Benzene-1,4-diol
Molecular Weight	110.11
Molecular Formula	C6H6O2
Melting Point	170-174ºC
Flash Point	165ºC
Density	1.332
Appearance	Off-white powder or white needle-like crystals
EC Number	204-617-8
Hazard Class	9
Hazard Codes	Xn
HS Code	2907221000
LogP	1.09780
MDL Number	MFCD00002339
PSA	4.46
Refractive Index	1.689
RIDADR	UN 2662
Risk Statements	R22; R40; R41; R43; R50; R68
RTECS	MX3500000
Safety Statements	S26-S36/37/39-S61
Stability	Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive. Discolours in air.
Vapor Density	3.81
Vapor Pressure	1 mm Hg ( 132 °C)
WGK Germany	3

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