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DINITROBENZENE (mixed isomers)ICSC: 0725
Dinitrobenzol (mixed isomers)
Benzene, dinitro
DNB
October 2001
CAS #: 25154-54-5
UN #: 3443
EC Number: 246-673-6

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible. Gives off irritating or toxic fumes (or gases) in a fire.  Finely dispersed particles form explosive mixtures in air.  NO open flames.  Closed system, dust explosion-proof electrical equipment and lighting. Prevent deposition of dust.  Use water spray, foam, powder, carbon dioxide.  In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. 

 PREVENT DISPERSION OF DUST! STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS PREVENTION FIRST AID
Inhalation Burning sensation. Headache. Blue lips, fingernails and skin. Weakness. Dizziness. Laboured breathing. Nausea. Drowsiness.  Use local exhaust or breathing protection.  Fresh air, rest. Artificial respiration may be needed. Refer for medical attention. 
Skin MAY BE ABSORBED! Further see Inhalation.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention . 
Eyes Redness. Pain.  Wear face shield or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion See Inhalation.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Give a slurry of activated charcoal in water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 6.1; UN Pack Group: II 

STORAGE
Separated from strong oxidants, powdered metals and food and feedstuffs. Well closed. 
PACKAGING
Do not transport with food and feedstuffs. 
DINITROBENZENE (mixed isomers) ICSC: 0725
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE-TO-PALE-YELLOW CRYSTALS WITH CHARACTERISTIC ODOUR. 

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

Chemical dangers
May explode on heating even in the absence of air. Reacts violently with powdered metals and strong oxidants. This generates fire and explosion hazard. Decomposes on heating. This produces toxic fumes including nitrogen oxides. 

Formula: C6H4(NO2)2 / C6H4N2O4
Molecular mass: 168.1
Boiling point: ~300°C
Density: 1.6 g/cm³
Solubility in water: poor
Vapour pressure, kPa at 20°C: <0.1
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01
Flash point: 150°C c.c.
Auto-ignition temperature: 470°C
Octanol/water partition coefficient as log Pow: 1.46-1.58  


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
The substance is irritating to the eyes and respiratory tract. The substance may cause effects on the blood. This may result in the formation of methaemoglobin. The effects may be delayed. Medical observation is indicated. 

Inhalation risk
A harmful contamination of the air can be reached rather quickly on evaporation of this substance at 20°C. 

Effects of long-term or repeated exposure
The substance may have effects on the blood and liver. This may result in anaemia and liver impairment. The substance may have effects on the nervous system. Animal tests show that this substance possibly causes toxicity to human reproduction or development. May cause impaired vision. 


OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.15 ppm as TWA; (skin); BEI issued.
MAK: skin absorption (H); carcinogen category: 3B 

ENVIRONMENT
The substance is toxic to aquatic organisms. 

NOTES
Use of alcoholic beverages enhances the harmful effect.
Depending on the degree of exposure, periodic medical examination is suggested.
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
See ICSC 0460: o-dinitrobenzene, 0691: m-dinitrobenzene, 0692: p-dinitrobenzene.
NFPA Code: H 3; F 1; R 4; for o-DNB.
October 2005: UN number updated.
See ICSCs 0490, 0691 and 0692. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: T+, N; R: 26/27/28-33-50/53; S: (1/2)-28-36/37-45-60-61; Note: C 

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       Toxicological Abbreviations