ICSC 0166 - HYDROQUINONE

[List of Chemicals] [Risk Notes] [Risk Phrases] [Safety Phrases] [Danger Symbols]

HYDROQUINONE

ICSC: 0166
_{October 2001}

1,4-Dihydroxybenzene
Hydroquinol
Quinol

CAS No: 123-31-9
RTECS No: MX3500000
UN No: 2662
EC No: 604-005-00-4

C₆H₆O₂ / C₆H₄(OH)₂
Molecular mass: 110.1

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	FIRST AID / FIRE FIGHTING
FIRE	Combustible.	NO open flames.	Powder, water spray, foam, carbon dioxide.
EXPLOSION	Finely dispersed particles form explosive mixtures in air.	Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting.

EXPOSURE		PREVENT DISPERSION OF DUST! AVOID ALL CONTACT!
Inhalation	Cough. Laboured breathing.	Local exhaust or breathing protection.	Fresh air, rest. Artificial respiration may be needed. Refer for medical attention.
Skin	Redness.	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes	Redness. Pain. Blurred vision.	Safety goggles.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion	Dizziness. Headache. Nausea. Shortness of breath. Convulsions. Vomiting. Ringing in the ears.	Do not eat, drink, or smoke during work. Wash hands before eating.	Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention.

SPILLAGE DISPOSAL	PACKAGING & LABELLING
Sweep spilled substance into sealable containers. Carefully collect remainder, then remove to safe place. Personal protection: P2 filter respirator for harmful particles. Do NOT let this chemical enter the environment.	Xn Symbol N Symbol R: 22-40-41-43-50-68 S: (2-)26-36/37/39-61 UN Hazard Class: 6.1 UN Pack Group: III	Do not transport with food and feedstuffs.

EMERGENCY RESPONSE	SAFE STORAGE
Transport Emergency Card: TEC (R)-61GT2-III NFPA Code: H2; F1; R0	Separated from strong bases, food and feedstuffs.

IMPORTANT DATA

Physical State; Appearance
COLOURLESS CRYSTALS.

Physical dangers
Dust explosion possible if in powder or granular form, mixed with air.

Chemical dangers
Reacts violently with sodium hydroxide.

Occupational exposure limits
TLV: 2 mg/m³ as TWA; A3 (confirmed animal carcinogen with unknown relevance to humans); (ACGIH 2004).
MAK: skin absorption (H); Carcinogen category: 2; Germ cell mutagen group: 3A; (DFG 2004).

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion.

Inhalation risk
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20°C.

Effects of short-term exposure
The substance is severely irritating to the eyes. The substance is irritating to the skin and the respiratory tract.

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. Repeated or prolonged contact may cause skin sensitization. The substance may have effects on the eyes and skin, resulting in discolouration of the conjunctiva and cornea and skin depigmentation. This substance is possibly carcinogenic to humans.

PHYSICAL PROPERTIES	ENVIRONMENTAL DATA
Boiling point: 287°C Melting point: 172°C Relative density (water = 1): 1.3 Solubility in water, g/100 ml at 15°C: 5.9 Vapour pressure, Pa at 20°C: 0.12 Relative vapour density (air = 1): 3.8 Relative density of the vapour/air-mixture at 20°C (air = 1): 1 Flash point: 165°C Auto-ignition temperature: 515°C Octanol/water partition coefficient as log Pow: 0.59	The substance is very toxic to aquatic organisms.

NOTES

Depending on the degree of exposure, periodic medical examination is suggested.
No odour warning if toxic concentrations are present.
Black & White Bleaching Cream, Diak 5, Eldopaque, Eldoquin, Tecquinol, Tenox HQ are trade names.
Card has been partly updated in April 2005. See sections Occupational Exposure Limits, EU classification, Emergency Response.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004

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