How is fire fighting foam classified in terms of fire fighting application?

Fire fighting foam is classified into three types of foam, based on expansion ratio (and consequently, its application). Most fire manuals use this classification –

Low expansion foam              : expansion ratio from 1:2 to 1:20 (most commonly used between 1:3 to 1:10, useful for flammable liquid fires)

Medium expansion foam        : expansion ratio from 1:21 to 1:200 (most commonly used between 1:30 to 1:60, useful for tackling spills/ spillfires)

High expansion foam              : expansion ratio from 1:201 to 1:2000 (most commonly used between 1:400 to 1:1500, useful in Class A and LNG applications

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