What is the primary function of PKP as an extinguishing agent?

The primary function of PKP, or Potassium Bicarbonate, as an extinguishing agent is to interrupt the chemical chain reaction of fire. When PKP is deployed, it releases potassium ions that react with free radicals involved in the combustion process. This action effectively disrupts the ongoing reactions that contribute to the sustaining of flames, thereby helping to extinguish the fire.

It is particularly effective on Class B fires, which involve flammable liquids and gases, but its mechanism of action through the interruption of the chain reaction is what makes it broadly applicable. This property is vital, as it not only quenches existing flames but also prevents them from reigniting. Understanding this function is crucial when selecting an appropriate extinguishing agent for various fire scenarios.