Product Identification

Product Name

Hydrogen

CAS

1333-74-0

Formula

H2

Molecular Weight

2.02

EINECS

215-605-7

RTECS

MW8900000

RTECS Class

Other

Merck

12,4833

Beilstein/Gmelin

2 (G)

EC Index Number

001-001-00-9

EC Class

Extremely flammable

Physical and Chemical Properties

Appearance

A colorless, odorless cryogenic liquid.

Solubility in water

0.17 mg/100 mL

Melting Point

-258.9

Boiling Point

-252.8

Density

0.071 g/cm3 (liquid, 20 C)

pKa/pKb

35(at 25℃) (pKa)

Heat Of Vaporization

0.98 kj/mol

Usage

Oxyhydrogen flame is used in processing of quartz, in production of several metals which resist fusion, such as molybdenum, bismuth.

Vapor Density

.07

Refractive Index

1.98

First Aid Measures

Ingestion

Seek medical assistance.

Inhalation

If victim is unconscious (due to oxygen deficiency), move him to fresh air and apply resuscitation methods; call physician.

Skin

Rewarming and a variety of topical treatments are indicated for frostbite injury. See main section for more information.

Eyes

Treat for frostbite.

Handling and Storage

Storage

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.

Handling

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.

Hazards Identification

Inhalation

Asphyxiant, headache, drowsiness, dizziness, excitation, salibation, vomiting, unconscious and death.

Skin

Dermal exposure may cause frostbite injury. Severe tissue burns have been reported.

Eyes

Decreases in night vision, visual acuity, and visual fields (tunnel vision) may occur. Frothy mucous may be seen.

Ingestion

Frostbite of the lips and mouth may result from contact with the liquid.

Hazards

Burns with an almost invisible flame.

UN (DOT)

1049

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Exposure Effects

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.

Poison Class

-

Fire Fighting Measures

Autoignition

500-571

Fire Fighting

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.

Upper exp. limit

76

Lower exp. limit

4

Fire Potential

Extremely flammable gas.

Accidental Release Measures

Small spills/leaks

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.

Stability and Reactivity

Incompatibilities

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.

Stability

Stable.

Decomposition

None.

Transport Information

UN Number

1049

Hazard Class

2.1