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details. Remember that even if certain ingredients in the product are labeled as trade secrets, the MSDS must contain all of the other required information. Exposure Limits The MSDS must also list the OSHA Permissible Exposure Limit (PEL) for each hazardous ingredient. It must also list Threshold Limit Values (TLVs) recommended by the American Conference of Governmental Industrial Hygienists and may also list workplace exposure limits recommended by the National Institute for Occupational Safety and Health (NIOSH). These are important because ACGIH and NIOSH often recommend exposure limits that are more up -t o - date and protective than OSHA's. Section III - Physical/Chemical Characteristics Physical and chemical characteristics include the chemical's appearance and odor, along with physical properties that indicate how easily a chemical will evaporate and release potentially harmful vapors into the air. • Boiling point: The boiling point of substance is the temperature at which the liquid boils or becomes a gas. The lower the boiling point, the quicker it evaporates and the easier it is to inhale. Chemicals with boiling points below 100oC (or 212oF) require special caution. • Vapor pressure: A high vapor pressure indicates that a liquid will evaporate easily. Chemicals which evaporate quickly are called volatile. This means that air concentrations can build up quickly, even though the substance is in liquid form. Liquids with high vapor pressures may be especially hazardous if you are working with them in a confined space or an enclosed area. • Vapor density: If the vapor density is less than one, it will tend to rise in air. If the vapor density is greater than one, it will fall in air and concentrate in the bottom of tanks or confined spaces. • Appearance and odor: This information may help identify a substance that spills or leaks in your work area. However, many chemicals are hazardous at levels lower than they can be smelled. Also, many chemicals, such as hydrogen sulfide and ammonia, cause "olfactory fatigue", which means that workers rapidly lose their ability to smell the substance. • Specific gravity: If the specific gravity is greater than one, the substance will sink in water; if less than one, it will Float on top of water. • Evaporation rate: This is the rate at which a substance evaporates compared to either ether, which evaporates quickly, or butyl acetate, which evaporates slowly. If the substance has an evaporation rate greater than one, it evaporates faster than the comparison substance. Section IV - Fire and Explosion Hazard Data This section should provide information on the fire hazards of a product and special precautions necessary to extinguish a fire. RECEIVED AUG 222017 ENVIRONMENTAL HEALTH DEPARTMENT