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  • 3-Amino-4-hydroxynitrobenzene
  • 2-Hydroxy-5-nitroaniline
  • p-Nitro-o-aminophenol
  • 4-Nitro-2-aminophenol
FormulaC6H6N2O3 (C6H6N2O3)
Description Orange prisms or yellow powder. No odor.
Uses Chemical intermediate for dyes (eg, ci mordant browns 1 and 33, ci pigment yellow 65), component of permanent & semi-permanent hair dye products.

Registry Numbers and Inventories.
EC Risk PhraseR:36/37/38-40
EC Safety PhraseS:26-36/37/39
ENCS (MITI) 3-788X
RTECS class Tumorigen (C); Mutagen (M); Primary Irritant (S)
UN (DOT)2811
Beilstein ref.4-13-00-00896
Listed on the Toxic Substancs Control Act (TSCA).
Listed on Canadian Non-Domestic Substances List (NDSL).
Listed on Australian Inventory of Chemical Substances (AICS).

Formula mass154.12
Melting point, °C176 - 177
Density1.66 g/cm3 (20 °C)
Solubility in waterslightly soluble
Partition coefficient, pKow1.13
Acid/Base3.1 (pka)

Hazards and Protection.
Storage Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Protection Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Stability Stable under normal temperatures and pressures.
Incompatibilities Acids, acid anhydrides, acid chlorides, chloroformates, strong oxidizing agents.
Decomposition Carbon monoxide, oxides of nitrogen, irritating and toxic fumes and gases, carbon dioxide.

Flash Point,°C100
Fire fighting Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential This material is probably combustible.

Exposure effects
May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
May cause skin irritation.
First aid 
Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.

UN number2811
Response guide

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