Which type of foam is typically used for combating oil fires?

Alcohol-resistant foam is specifically formulated to combat fires involving flammable liquids such as oils and alcohols. This type of foam creates a barrier that prevents the fuel from vaporizing and helps to smother the flames. It is effective for dealing with polar solvents and is commonly used in fire scenarios where oil products are present, as it not only suppresses the fire but also helps to prevent re-ignition.

In the context of combating oil fires, this foam is essential because it can effectively seal off the fuel's surface, thereby reducing the risk of ignition and expanding fire spread. Other foam types, while they may serve specific functions, do not have the necessary properties for effectively addressing oil fires.