WM 4 WM 5

SECTION 2: Hazards identification

EMERGENCY OVERVIEW: This is a colorless, odorless, non-flammable gas mixture. The main health hazard associated with releases of this gas mixture is asphyxiation by displacement of oxygen, when the oxygen in the mixture is at a low level (below 19.5%). A cylinder rupture hazard exists when this gas mixture, which is under pressure, is subject to heat or flames. SYMPTOMS OF OVER-EXPOSURE BY ROUTE OF EXPOSURE: The most significant route of over- exposure for this product is by inhalation. INHALATION: When this gas mixture contains less than 19.5% oxygen, high concentrations of this gas mixture can cause an oxygen-deficient environment, especially if released in a poorly-ventilated area (e.g., an enclosed or confined space). Individuals breathing such an atmosphere may experience symptoms which include headaches, ringing in ears, dizziness, drowsiness, unconsciousness, nausea, vomiting, and depression of all the senses. Under some circumstances of overexposure, death may occur. The effects associated with various levels of oxygen are as follows: CONCENTRATION OF OXYGEN OBSERVED EFFECT 12-16% Oxygen: Breathing and pulse rate increase, muscular coordination slightly disturbed. 10-14% Oxygen: Emotional upset, abnormal fatigue, disturbed respiration. 6-10% Oxygen: Nausea, vomiting, collapse, or loss of consciousness. Below 6%: Convulsive movements, possible respiratory collapse, and death. CONTACT WITH SKIN or EYES: Contact with rapidly expanding gases (which are released under high pressure) may cause frostbite. SKIN ABSORPTION: No component of this gas mixture presents a hazard of skin absorption. HEALTH EFFECTS OR RISKS FROM EXPOSURE: Over-exposure to this gas mixture may cause the following health effects: ACUTE: The most significant hazard associated with this gas mixture is inhalation of oxygen-deficient atmospheres. Symptoms of oxygen deficiency include ringing in ears, headaches, shortness of breath, wheezing, dizziness, indigestion, and nausea. At high concentrations, unconsciousness or death may occur. CHRONIC: There are currently no known adverse health effects associated with chronic exposure to this gas mixture. TARGET ORGANS ACUTE Respiratory system. CHRONIC None

HMIS® ratings

HEALTH = 0 FLAMMABILITY = 0 REACTIVITY = 0 Hazard Scale: 0 = Minimal 1 = Slight 2 = Moderate 3 = Serious 4 = Severe