Light yellow crystals with an aromatic odor.
Acid-base indicator. Corrosion inhibitor for aluminium-copper alloy.
Registry Numbers and Inventories.
R 20/22 33 36/37/38
S 26 36/37/39
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
43 - 45
Boiling point, °C
Sublimation point, °C
30 (3 torr)
Vapor pressure, mmHg
0.093 (25 C)
Vapor density (air=1)
Odor Threshold Odor threshold 0.11-0.13 mg/m3
1.599 g/cm3 (20 C)
Solubility in water
2.31 cp (50 C)
42.3 g/s2 (50 C)
1.5723 (50 C)
16.7 (60 C)
Partition coefficient, pKow
Heat of fusion
Heat of vaporization
Heat of combustion
Hazards and Protection.
Tightly closed containers. Keep away from heat and water and from combustible organic or other readily oxidizable material.
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Wear impervious protective clothing, including boots, gloves, lab coat, apron or coveralls, as appropriate, to prevent skin contact. Use chemical safety goggles and/or full face shield where dusting or splashing of solutions is possible.
For conditions of use where exposure to the dust or mist is apparent, a half-face dust/mist respirator may be worn. For emergencies or instances where the exposure levels are not known, use a full-face positive-pressure, air-supplied respirator.
Sweep up, then place into a suitable container for disposal.
Stable under normal temperatures and pressures.
Halogen acids and strong oxidizing agents. In liquid/molten state, reacts violently with potassium hydroxide.
Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.
Wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full facepiece operated in the pressure demand or other positive pressure mode. Extinguishing agents: water, foam, dry chemical, carbon dioxide. Do not allow water runoff to enter sewers or waterways.
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Toxic and irritating fumes of unburned material and oxides of nitrogen can form in fire.
Chronic exposure may damage the liver and kidneys.
Toxic. Harmful if swallowed. Can cause formation of methemoglobin, resulting in cyanosis (blue lips), headaches, dizziness and collapse. Exposure to high concentrations may cause breathing trouble, a slow pulse, fall in blood pressure, convulsions and even death.
Causes irritation to the respiratory tract. Symptoms may include coughing, shortness of breath. Can be a route of absorption by the body with symptoms like ingestion.
Causes irritation to skin. Symptoms include redness, itching, and pain. May be absorbed through the skin with possible systemic effects.
Causes irritation, redness, and pain.
Do NOT induce vomiting. Allow the victim to rinse his mouth and then to drink 2-4 cupfuls of water, and seek medical advice.
Remove from exposure to fresh air immediately.
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.