What is the foam type categorized as 'Wet'?

Wet foam is typically classified based on its application concentration and the characteristics of the foam solution used in firefighting. The categorization signifies the proportion of foam concentrate mixed with water, which determines its effectiveness and behavior when applied to flammable liquids.

In this case, the classification as 'Wet' refers specifically to a very low concentration, which is approximately between 0.1% and 0.3%. This range is specifically designed for tackling fires involving flammable liquids where a lighter and more finely dispersed foam is beneficial. The lower concentration allows for a quicker spread over the fuel surface, enhancing the cooling effect and reducing the flammable vapors more rapidly.

Higher concentrations, such as those exceeding 0.3%, start to produce a denser foam that may become less effective in extinguishing certain types of fires, particularly those that require a quicker, more immediate response. Therefore, the 0.1% to 0.3% categorization is optimal for specific applications in firefighting where a wet foam is indicated.