Radium Fuel Cell Foam, One PieceMandated by the FiA, fuel cell foam is used both as an explosion suppressant as well as baffling. This reticulated foam is manufactured from polyurethane and meets MIL DTL 83054C Type II. At 15 pores per inch (nominal), it displaces only 0. 07 gallons (or 9oz) of fuel per foam piece. After every race season, inspect the condition of fuel cell foam and replace at least every 3 seasons. While it was designed for longevity in hydrocarbon fuels, Radium