A colorless, odorless cryogenic liquid.
Oxyhydrogen flame is used in processing of quartz, in production 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 (liquid, 20 C)
Solubility in water
0.17 mg/100 mL
8.6E-5 P (0 C)
2.126 erg/cm2 (-252.7 C)
1.00 (16.5 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.
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.
Wear positive pressure self-contained breathing apparatus (SCBA).
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.
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.
Upper exp. limit, %
Lower exp. limit, %
Wear NIOSH/MSHA approved SCBA, flame and chemical resistant clothing. If it can be done without rist, remove material from fire area. 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.
Extremely flammable gas.
Burns with an almost invisible flame.
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.
Frostbite of the lips and mouth may result from contact with the liquid.
Asphyxiant, headache, drowsiness, dizziness, excitation, salibation, vomiting, unconscious and death.
Dermal exposure may cause frostbite injury. Severe tissue burns have been reported.
Decreases in night vision, visual acuity, and visual fields (tunnel vision) may occur. Frothy mucous may be seen.
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 #