A colorless, odorless gas. Shipped as a compressed gas.
Oxyhydrogen flame is used in processing of quartz, in prodn of several metals which resist fusion, such as molybdenum, bismuth.
Registry Numbers and Inventories.
EC Index Number
Swiss Giftliste 1
Melting point, °C
Boiling point, °C
Vapor density (air=1)
0.071 g/cm3 (20 C)
Solubility in water
1.7 mg/L (20 C)
8.6E-5 P (0 C)
2.438 erg/cm2 (-254.5 C)
1.00026 (0 C)
0.00366/K (20 C)
Heat of fusion
Heat of vaporization
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. Grounding and bonding of containers is required.
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.
Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
For Unknown Concentrations or Immediately Dangerous to Life or Health - Any supplied-air respirator with full facepiece and operated in a pressure-demand or other positive-pressure mode in combination with a separate escape supply. Any self-contained breathing apparatus with a full facepiece.
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors. Do not use water on material itself.
Stable at normal temperature and pressures.
Reacts violently with air, oxygen, chlorine, fluorine, strong oxidizers causing fire and explosion hazard. Metal catalysts, such as platinum and nickel, greatly enhance these reactions.
Heating may cause violent combustion or explosion.
Upper exp. limit, %
Lower exp. limit, %
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Do not use water on material itself.
Severe fire hazard. Severe explosion hazard. Vapor/air mixtures are explosive. May ignite spontaneously.
Pressurized containers may rupture or explode if exposed to sufficient heat. Electrostatic discharges may be generated by flow or agitation resulting in ignition or explosion.
Rapid breathing and rapid heart rate are common. In severe cases abnormally low blood pressure, apnea, and cardiac arrest develop. Various disturbances including headache, dizziness, mood disturbances, numbness of the extremities, sleepiness, mental confusion, poor judgement and coordination, and memory loss may occur. Prolonged or severe hypoxia results in unconsciousness. Prolonged asphyxia may produce CNS injury. Hemiparesis has been reported with volatile substance abuse. Cerebral edema with brainstem herniation may occur. Seizures have been reported following intentional inhalation.
Unlikely route of exposure. Material is a gas at room temperature and atmospheric pressure and is essentially nontoxic.
Simple asphyxiant. Inhalation of high concentrationss of hydrogen may cause dizziness, headache, possible nausea and eventual unconsciousness.
Seek medical assistance.
If victim is unconscious (due to oxygen deficiency), move him to fresh air and apply resuscitation methods; call physician.
Rewarming and a variety of topical treatments are indicated for frostbite injury. See main section for more information.
Treat for frostbite.
USCG CHRIS Code
Std. Transport #