This part of ISO 7203 specifies the essential properties and performance of liquid foam concentrates used to
make medium- or high-expansion foams or both for the control, extinction and inhibition of reignition of fires of
water-immiscible liquids. Minimum performance on certain test fires is specified.
These foams are suitable for top application to fires of water-immiscible liquid. Those foams that comply with
ISO 7203-1 are also suitable for top application to fires of water-immiscible liquids.