Summary

Chapter 2: Safe Lab Procedures and Tool Use 5CautionBe sure to read the instructions on the fire extinguishers in your workplace before you have to usethem. Safety training might be available in your organization.In the United States, there are four classifications for fire extinguishers. A different letter,color, and shape identify each fire extinguisher classification, as shown in Figure 2-1. Eachfire extinguisher has specific chemicals to fight each specific type of fire as follows:■■■■Class A: Effective for fires burning paper, wood, plastics, and cardboard materialsClass B: Effective for fires burning gasoline, kerosene, or organic solventsClass C: Effective for fires burning electrical equipmentClass D: Effective for fires burning combustible metals, such as magnesium andtitanium.Figure 2-1Fire Extinguisher ClassificationsFire extinguisher classifications might vary by country.It is important to know how to use a fire extinguisher. Use the memory aid P-A-S-S to helpyou remember the basic rules of fire extinguisher operation:■■■■P: Pull the pin.A: Aim at the base of the fire, not at the flames.S: Squeeze the lever.S: Sweep the nozzle from side to side.