Industrial model . FSS is a portable manual aerosol dispenser with remarkable extinguishing capacity. It is non-toxic, non-corrosive and environmentally safe. It is a small lightweight cylinder: the upper part is a metal tube containing the extinguishing charge; the lower part is made of plastic and serves as a support handle. Upon ignition, the powerful extinguishing charge produces a potassium aerosol jet that lasts up to approx 100 seconds. Point the nozzle at the base of the flames to smother the fire at its core.