Descriptors | Firefighting, Firefighting equipment, Compatibility, Fire extinguishers, Powder fire extinguishers, Marking, Particulate materials, Particle size measurement, Fire tests, Particle size distribution, Screening (sizing), Bulk density, Moisture measurement, Sampling methods, Moisture, Testing conditions, Specimen preparation, Performance, Low-temperature testing, Compositional tolerances, Water content determination, Grades (quality), Drop tests, Dielectric strength, Dielectric-strength tests, Density measurement, Performance testing, Test equipment, Penetration tests, Water-absorption tests |