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NIOSH

HYDROQUINONE

ICSC: 0166

1,4-Dihydroxybenzene
Hydroquinol
Quinol
C6H6O2 / C6H4(OH)2
Molecular mass: 110.1
ICSC # 0166 		CAS # 123-31-9
RTECS # MX3500000
UN # 2662
EC # 604-005-00-4
October 15, 2001 Validated

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

STORAGE

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.
Separated from strong bases, food and feedstuffs .
Do not transport with food and feedstuffs.
Xn symbol
N symbol
R: 22-40-41-43-50-68
S: 2-26-36/37/39-61
UN Hazard Class: 6.1
UN Packing Group: III
ICSC: 0166 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

HYDROQUINONE

ICSC: 0166

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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).
OSHA PEL: TWA 2 mg/m3
NIOSH REL: C 2 mg/m3 15-minute
NIOSH IDLH: 50 mg/m3 See: 123319


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

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

ENVIRONMENTAL
DATA

The substance is very toxic to aquatic organisms.

N O T E S

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.
Transport Emergency Card: TEC (R)-61GT2-III

NFPA Code: H2; F1; R0;

ADDITIONAL INFORMATION



ICSC: 0166 HYDROQUINONE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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