What does B-II classification refer to in portable fire extinguishers?

B-II classification in portable fire extinguishers specifically indicates the effectiveness of the extinguisher against flammable liquids. The classification is part of a system that categorizes extinguishers based on the types of fires they are intended to combat. In this case, a B-II rating means that the extinguisher is appropriate for use on fires involving flammable liquids, such as gasoline, oils, and solvents, which can be common fire hazards in many environments.

This classification is crucial for ensuring that the right type of extinguisher is available for specific fire scenarios, particularly in industries or situations where flammable liquids are present. Understanding the ratings helps users select the correct extinguisher for the type of fire they might encounter, promoting safety and effectiveness in fire response.