What is the expansion ratio for high expansion foam?

The expansion ratio for high expansion foam is characterized by its ability to produce a significant volume of foam relative to the amount of concentrate used. High expansion foam is designed to fill large volumes quickly and is particularly effective in scenarios like protecting large areas, such as aircraft hangars or warehouses.

An expansion ratio of 200:1 to 1000:1 indicates that for every part of foam concentrate, 200 to 1000 parts of foam can be generated. This substantial expansion is crucial for smothering fires in enclosed spaces by displacing oxygen and creating a barrier. Such a high expansion ratio is indicative of the foam’s capacity to cover large areas and fill voids effectively, which is necessary in situations where traditional firefighting methods may be less effective.

In contrast, lower ratios offered in other choices describe types of foam that are not considered high expansion. Understanding the characteristics of different foam types, including their expansion ratios, allows firefighters to select the appropriate foam for particular fire suppression scenarios.