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PRODUCT NAME

Helium

CAS#

7440-59-7

TRADE NAME AND SYNONYMS

Helium; Helium, Compressed

DOT I.D. No.

UN 1046

CHEMICAL NAME AND SYNONYMS

Helium

DOT Hazard Class

Division 2.2

ISSUE DATE AND REVISIONS

Formula

Revised June 2007

Chemical Family

Inert Gas

HEALTH HAZARD DATA

TIME WEIGHTED AVERAGE EXPOSURE LIMIT

Helium is defined as a simple asphyxiant. Oxygen levels should be maintained at greater than 18 molar percent at normal atmospheric pressure which is equivalent to a partial pressure of 135 mm Hg (ACGIH 1990-1991). OSHA 1989 does not list a TWA for helium.

SYMPTOMS OF EXPOSURE

Effects of exposure to high concentrations so as to displace the oxygen in the air necessary for life are headache, dizziness, labored breathing and eventual unconsciousness. Breathing mixtures of helium with adequate oxygen to support life modifies the voice sound so that it is higher “pitched.”

1, 3 butadiene, pure hydrogen and high purity oxygen, nitrogen, argon, hydrogen, nitrogen dioxide, trimethyl bromide boron TMB, silane and silane mix other gas, hydrogen, nitrogen trifluoride selenide, boron trifluoride, liquid ammonia, etching gas, electronic gas, six fluoride oxide, hydrogen sulfide, and methane, high pure butane, high purity isobutane methane, high purity, high purity, high purity propane butane, high-purity propylene and isobutylene, butadiene, ethane, butene, anti - 2 - butene, propylene, propiolic, vinyl acetylene, ethyl acetylene, carbonyl sulfur, allene, sulfur hexafluoride, new pentane, carbon tetrafluoride, eight fluorine cyclobutane, nitric oxide, high purity nitrous oxide (n2o), hydrogen chloride, high purity helium, ultrapure, ultra pure nitrogen, pure argon and helium gas standard.Trimethyl gallium, trimethyl indium gallium, trimethyl aluminum, triethyl, triethyl indium, diethyl zinc, zinc dimethyl, dicyclopentadienyl magnesium source (MO)