M.S.D.S. 0408
Material Safety Data Sheet
City University of Hong Kong
MSDS HYDROQUINONE 0408
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PRODUCT INFORMATION
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Chemical name and Synonyms:
1,4-Dihydroxybenzene; p-Dihydroxybenzene; 1,4-Benzenediol; Dihydroxybenzene; Quinol
Chinese Name: 戮J隆F陇G<虏B>
CAS No: 123-31-9
Molecular Weight: 110.11
Chemical Formula: C6H4(OH) 2
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RISK SYMBOL
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PHYSICAL DATA
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Appearance: White crystals.
Boiling Point: 285掳C (545掳F)
Odor: Odorless.
City University of Hong Kong 1
The above information is believed to be accurate to the best of our knowledge.
No responsibilities or liabilities are assumed or implied by CITY U for their inaccuracies.
Melting Point: 170掳C (338掳F)
Solubility: 7g/100g water @ 25C (77掳F).
Vapor Density (Air=1): 3.81
Specific Gravity: 1.33 @ 15掳C
Vapor Pressure (mm Hg): 4 @ 150掳C (302掳F)
pH: No information found.
Evaporation Rate (BuAc=1): No information found.
% Volatiles by volume @ 21掳C (70掳F): 0
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FIRE AND EXPLOSION DATA
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Fire:
Flash point: 165掳C (32掳9F) CC
Autoignition temperature: 516掳C (961掳F)
May pose a fire hazard when exposed to heat, flame, or oxidizing agents.
Explosion:
Fine dust dispersed in air in sufficient concentrations, and in the presence of an ignition source is a potential dust
explosion hazard.
Fire Extinguishing Media:
Dry chemical, alcohol foam or carbon dioxide. Water or foam may cause frothing.
Special Information:
In the event of a fire, wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full
facepiece operated in the pressure demand or other positive pressure mode.
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REACTIVITY DATA
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Stability:
Stable under ordinary conditions of use and storage. Solution becomes brown in air due to oxidation.
Hazardous Decomposition Products:
Quinone and oxides of carbon may be formed when this material is heated to decomposition.
Hazardous Polymerization: Will not occur.
Incompatibilities: Sodium hydroxide, strong alkalis, and oxidizers. Conditions to Avoid: Heat, flame, ignition
sources, incompatibles, light, and air.
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HEALTH HAZARD DATA
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Emergency Overview:
Danger! May be fatal if swallowed. Affects central nervous system. Causes severe skin and eye irritation. Harmful if
inhaled. May cause allergic skin reaction. Causes irritation to respiratory tract.
The above information is believed to be accurate to the best of our knowledge.
No responsibilities or liabilities are assumed or implied by CITY U for their inaccuracies.
M.S.D.S. 0408
Potential Health Effects
Inhalation:
Causes irritation to the respiratory tract. Symptoms may include coughing, shortness of breath. Systemic effects
have not been proven by this route.
Ingestion:
Highly toxic. May cause hyperactivity, stupor, fall in blood pressure, hyperpnea, abdominal pain, diarrhea, intense
thirst, sweating, tinnitis, nausea, dizziness, a sensation of suffocation, an increased rate of respiration, vomiting,
pallor, muscular twitching, headache, cyanosis, delirium, and collapse (from respiratory failure). Estimated lethal
dose lies between 5 to 12 grams (usually because of respiratory failure from methemoglobin formation which
leaves the blood unable to carry oxygen). May cause green to brownish-green urine.
Skin Contact: Causes severe irritation, redness and pain. Alkaline solutions can cause skin sensitization.
Eye Contact: Causes severe irritation and possible corneal ulceration.
Chronic Exposure:
Repeated exposure to vapor or dust (typically 10 to 30 mg/m3) for > 5 years has caused brownish staining of the
conjunctiva which may be followed by changes to the cornea leading to loss of visual acuity. Repeated exposure may
also cause skin effects.
Aggravation of Pre-existing Conditions:
Persons with pre-existing skin or eye disorders or impaired respiratory function may be more susceptible to the
effects of this substance.
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FIRST AID MEASURES
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Inhalation:
Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical
attention.
Ingestion:
If swallowed, DO NOT INDUCE VOMITING. Give large quantities of water. Never give anything by mouth to an
unconscious person. Get medical attention immediately.
Skin Contact:
Wipe off excess material from skin then immediately flush skin with plenty of soap and water for at least 15
minutes. Remove contaminated clothing and shoes. Get medical attention. Wash clothing before reuse. Thoroughly
clean shoes before reuse.
Eye Contact:
Immediately flush eyes with plenty of water for at least 15 minutes, lifting upper and lower eyelids occasionally.
Get medical attention.
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PREVENTATIVE MEASURES
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City University of Hong Kong 3
The above information is believed to be accurate to the best of our knowledge.
No responsibilities or liabilities are assumed or implied by CITY U for their inaccuracies.
Airborne Exposure Limits:
-OSHA Permissible Exposure Limit (PEL): 2 mg/m3 (TWA)
-ACGIH Threshold Limit Value (TLV): 2 mg/m3 (TWA)
Ventilation System:
A system of local and/or general exhaust is recommended to keep employee exposures below the Airborne
Exposure Limits. Local exhaust ventilation is generally preferred because it can control the emissions of the
contaminant at its source, preventing dispersion of it into the general work area. Please refer to the ACGIH
document, "Industrial Ventilation, A Manual of Recommended Practices", most recent edition, for details.
Personal Respirators (NIOSH Approved):
If the exposure limit is exceeded, a full facepiece respirator with organic vapor cartridge and dust/mist filter may be
worn up to 50 times the exposure limit or the maximum use concentration specified by the appropriate regulatory
agency or respirator supplier, whichever is lowest. For emergencies or instances where the exposure levels are not
known, use a full-facepiece positive-pressure, air-supplied respirator. WARNING: Air purifying respirators do not
protect workers in oxygen-deficient atmospheres. This compound possibly exists in both particulate and vapor
phase. A gas/vapor cartridge should be used in addition to the particulate filter. If the vapor concentration alone
exceeds the exposure limits, use a supplied air respirator, because warning properties are unknown for these
compounds.
Skin Protection:
Wear impervious protective clothing, including boots, gloves, lab coat, apron or coveralls, as appropriate, to prevent
skin contact.
Eye Protection:
Use chemical safety goggles and/or full face shield where dusting or splashing of solutions is possible. Maintain
eye wash fountain and quick-drench facilities in work area.
Handling and Storage:
Keep in a tightly closed container, stored in a cool, dry, ventilated area. Protect against physical damage. Isolate
from any source of heat or ignition. Isolate from oxidizing materials. Protect from direct sunlight. Containers of
this material may be hazardous when empty since they retain product residues (dust, solids); observe all warnings
and precautions listed for the product.
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ENVIRONMENTAL PROTECTION DATA
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Remove all sources of ignition. Ventilate area of leak or spill. Wear appropriate personal protective equipment as
specified in Section 8. Spills: Clean up spills in a manner that does not disperse dust into the air. Use non-sparking
tools and equipment. Reduce airborne dust and prevent scattering by moistening with water. Pick up spill for
recovery or disposal and place in a closed container. US Regulations (CERCLA) require reporting spills and
releases to soil, water and air in excess of reportable quantities. The toll free number for the US Coast Guard
National Response Center is (800) 424-8802.
The above information is believed to be accurate to the best of our knowledge.
No responsibilities or liabilities are assumed or implied by CITY U for their inaccuracies.
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