A colorless to bluish gas that condenses to a dark blue liquid, or blue-black crystals. Has a characteristic odor in concentrations less than 2 ppm.
As disinfectant for air and water by virtue of its oxidizing power. For bleaching waxes, textiles, oils. In organic syntheses.
Registry Numbers and Inventories.
Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
Swiss Giftliste 1
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
Vapor density (air=1)
1.614 g/cm3 (20 C)
Solubility in water
Hazards and Protection.
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
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.
Workers handling liquid ozone should wear protective equipment designed for exposure to cryogenic liq, eg gloves made from plastics or asbestos, eye and face protection.
Use NIOSH/MSHA approved respirator appropriate for exposure of concern.
Isolate area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Workers handling liquid ozone should wear protective equipment designed for exposure to cryogenic liquid.
In case of fire: keep cylinder cool by spraying water.
Powerful oxidizing agent. Evolves more heat and usually starts at a lower temperature than oxidation with biatomic oxygen. Dangerous fire. Risk in contact with organic materials.
Severe explosion hazard when shocked, exposed to heat or flame, or by chemical reaction with organic substances, especially reducing agents. Ozone is a powerful oxidizing agent. Incompatible with alkenes; aromatic compounds; benzene, rubber; bromine; dicyanogen; diethyl ether; dinitrogen tetroxide; hydrogen bromide; 4-hydroxy-4-methyl-1,6-heptadiene; nitrogen trichloride; stibine; tetrafluorohydrazine. Avoid contact with organic materials.
TLV: 0.1 ppm; 0.20 mg/m3 as Ceiling (ACGIH 1991-1992). OSHA PEL: TWA 0.1 ppm (0.2 mg/m3) NIOSH REL: C 0.1 ppm (0.2 mg/m3) NIOSH IDLH: 5 ppm
Decreased pulse rate and blood pressure may occur in humans after inhalation. Drowsiness, dizziness, headache and fatigue have been reported after industrial exposure. Some abnormalities have been seen in mice exposed prenatally. Teratogenic effects were observed in rat experiments. <br>Teratogenic effects were observed in rat experiments.
Anorexia, nausea and vomiting have been seen.
Ozone is highly toxic via inhalation or by contact of liquid to skin, eyes, or mucous membranes. It is capable of causing acute to chronic lung damage, burns, and death or permanent injury. Ozone can be toxic at a concentration of 100 ppm for 1 minute. Ozone is capable of causing death from pulmonary edema. It increases sensitivity of the lungs to bronchoconstrictors and allergens, increases susceptibility to and severity of lung bacterial and viral infections.
Severe burns can occur from direct contact with the cryogenic liquid or with escaping compressed gas.
Inflammation of the eye has been reported. Levels of 2 ppm for 2 hours produced throat and mouth dryness.
Seek medical attention. If individual is drowsy or unconscious, do not give anything by mouth; place individual on the left side with the head down. Contact a physician, medical facility, or poison control center for advice about whether to induce vomiting. If possible, do not leave individual unattended.
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
Remove contaminated clothing. Wash exposed area with soap and water. If symptoms persist, seek medical attention. Launder clothing before reuse.
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.
USCG CHRIS Code