2,5-Cyclohexadiene-1,4-dione
Quinone
1,4-Benzoquinone
p-Quinone
C6H4O2
Molecular mass: 108.1
ICSC # 0779
CAS # 106-51-4
RTECS # DK2625000
UN # 2587
EC # 606-013-00-3
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Flammable.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO open flames, NO sparks, and NO smoking.
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Water spray,
powder,
carbon dioxide.
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Explosion
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Above 38°C explosive vapour/air mixtures may be formed.
Finely dispersed particles form explosive mixtures in air.
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Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting.
Prevent build-up of electrostatic charges (e.g., by grounding).
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In case of fire: keep drums, etc., cool by spraying with water.
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Exposure
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PREVENT DISPERSION OF DUST!
STRICT HYGIENE!
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IN ALL CASES CONSULT A DOCTOR!
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•Inhalation
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Burning sensation.
Cough.
Laboured breathing.
Shortness of breath.
Sore throat.
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Local exhaust or breathing protection.
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Fresh air, rest.
Half-upright position.
Refer for medical attention.
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•Skin
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Redness.
Pain.
Discolouration.
Blisters.
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Protective gloves.
Protective clothing.
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Remove contaminated clothes.
Rinse and then wash skin with water and soap.
Refer for medical attention.
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•Eyes
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Redness.
Pain.
Blurred vision.
Brown staining.
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Safety spectacles
face shield
or
eye protection in combination with breathing protection.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Abdominal pain.
Burning sensation.
Diarrhoea.
Vomiting.
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Do not eat, drink, or smoke during work.
Wash hands before eating.
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Rinse mouth.
Give a slurry of activated charcoal in water to drink.
Do NOT induce vomiting.
Refer for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting.
Carefully collect remainder,
then remove to safe place.
Do NOT let this chemical enter the environment.
Personal protection: P3 filter respirator for toxic particles.
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Fireproof.
Separated from
combustible and reducing substances,
food and feedstuffs
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Cool.
Dry.
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Do not transport with food and feedstuffs.
T symbol
N symbol
R: 23/25-36/37/38-50
S: 1/2-26-28-45-61
UN Hazard Class: 6.1
UN Packing Group: II
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Important Data
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Physical State; Appearance:
YELLOW
CRYSTALS
, WITH PUNGENT ODOUR.
CAN SUBLIME EVEN AT ROOM TEMPERATURE.
Physical Dangers:
Dust explosion possible if in powder or granular form, mixed with air.
If dry, it can be charged electrostatically by swirling, pneumatic transport, pouring, etc.
Chemical Dangers:
The substance decomposes
on warming above 60°C, when moist,
producing carbon monoxide.
Reacts as a weak oxidant
violently with some combustible substances, reducing agents and strong bases.
Occupational Exposure Limits:
OSHA PEL: TWA 0.4 mg/m3 (0.1 ppm)
NIOSH REL: TWA 0.4 mg/m3 (0.1 ppm)
NIOSH IDLH: 100 mg/m3 See: 106514
TLV: 0.1 ppm as TWA (ACGIH 2004).
MAK: Sh
Carcinogen category: 3B; Germ cell mutagen group: 3B;
(DFG 2004).
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Routes of Exposure:
The substance can be absorbed into the body
by inhalation,
by ingestion.
Inhalation Risk:
A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20°C.
Effects of Short-Term Exposure:
The substance
irritates
the eyes,
the skin
and
the respiratory tract.
The substance may cause effects on the eyes.
Exposure far above the OEL may result in respiratory failure and death.
Effects of Long-Term or Repeated Exposure:
Repeated or prolonged contact with skin may cause dermatitis.
The substance may have effects on the skin and eyes
, resulting in discolouration, inflammation and injury of the corneal epithelium.
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Physical
Properties
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Boiling point: ca. 180°C
Melting point: 116°C
Solubility in water:
poor
Vapour pressure, Pa at 20°C: 12
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Relative vapour density (air = 1): 3.7
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.0
Flash point: (see Notes) 38-93°C
Auto-ignition temperature: 560°C
Octanol/water partition coefficient as log Pow: 0.2
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Environmental
Data
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The substance is very toxic to aquatic organisms.
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N O T E S
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Physical properties (e.g. flash point) depend largely on humidity.
The odour warning when the exposure limit value is exceeded is insufficient.
Card has been partly updated in October 2004. See sections Occupational Exposure Limits, EU classification, Emergency Response.
Transport Emergency Card: TEC (R)-61GT2-II
NFPA Code: H1; F2; R1;
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ADDITIONAL INFORMATION
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ICSC: 0779
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p-BENZOQUINONE
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(C) IPCS, CEC, 1994
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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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