Information about the chemical's hazards. Physical information that will help you identify the chemical and how it behaves. Also listed on most MSDS is the Hazardous Material Information Guide which can tell you the reactability, flammability, and health hazards as well as protective clothing or equipment to wear. These are often represented by a four section diamond. With numbers indicating the reactibility, flammability, and health hazard.
Letters indicate the level of protective equipment to wear.
Often HMIG are labeled on a chemical. Look for this label. Highly Toxic - May be fatal on short term exposure. Special protective equipment required. Toxic - Avoid inhalation or skin contact.