TABLE OF CONTENTS SYNONYMS: EINECS No. 231-168-5; HELIO (Spanish); HELIUM, COMPRESSED; HELIUM GAS; HELIUM, REFRIGERATED LIQUID; HELIUM CRYOGENIC LIQUID
IDENTIFICATION:
CAS: 7440-59-7
DOT ID: UN1046 (compressed); UN1963 (liquid, refrigerated)
ERG Guide: 121 (UN1046); 120 (UN1963)
Formula: He
RTECS No: MH6520000
Properties: Colorless, odorless, inert, nonflammable gas.
Uses: Welding.
HEALTH & SAFETY INFORMATION
A simple asphyxiant. Gas is lighter than air, but cold vapor is heavier than air and can accumulate at ground level, causing oxygen deficiency. Rapid evaporation of the liquid may cause frostbite.
Respirator: At any concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: SCBAF:PD,PP (any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode) ? SAF:PD,PP:ASCBA (any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained breathing apparatus operated in a pressure-demand or other positive-pressure mode). Escape: GMFOV [any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister] ? SCBAE (any appropriate escape-type, self-contained breathing apparatus).
FIRST AID: Move victim to fresh air. Call emergency medical care. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult. Clothing frozen to the skin should be thawed before being removed. In case of contact with liquefied gas, thaw frosted parts with lukewarm water. Keep victim warm and quiet. Ensure that medical...
