What describes foam that has a foam expansion ratio of 200:1 to 2000:1?

Foam that has a foam expansion ratio of 200:1 to 2000:1 is classified as high expansion foam. This type of foam is characterized by its ability to create a significant volume of foam that can effectively blanket and suppress flames over large areas. High expansion foam is particularly useful in situations where there are large quantities of flammable liquids or in confined spaces, as it can displace oxygen and smother fires while also providing rapid coverage.

The specific range of expansion ratios indicates the foam's capacity to expand a relatively small amount of liquid foam concentrate into a much larger volume of finished foam, thereby enhancing its effectiveness in firefighting. In contrast, lower expansion foams, such as low or medium expansion varieties, exhibit much smaller volume increases and are used for different applications, focusing on applications where quicker applications or less coverage area are appropriate.