What is Class A firefighting foam?

Class A ‘Bush’ Firefighting Foam is a formulation qualified by the USDA Forest Service in accordance with Forest Service Specification 5100-307A .

It comes in a variety of pack sizes, including 2 litres, 20 litres and bulk 1 ton. The foam is a concentrate that, when mixed with water, expands up to 100 times (20 litres concentrate makes 2,000 litres of finished foam).

We would normally recommend that this is used in a device like a Propak, where the pure concentrate is mixed with the water as it is used and then the user can adjust the foam mix at the nozzle.