【TBT】BOS ISO 7203-3:2019 Fire extinguishing media — Foam concentrates- Part 3: Specification for low-expansion foam concentrates for top application to water-miscible liquids
【TBT】BOS ISO 7203-2:2019 Fire extinguishing media — Foam concentrates-Part 2: Specification for medium- and high-expansion foam concentrates for top application to water-immiscible liquids