Table 7-3.—Classification of Fires Class A—Fires in ordinary combustible materials such as mattresses, dunnage, wood, canvas, and paper. Class B—Fires in substances such as gasoline, fuel oil, lubricating oil, diesel oil, and paints.     Class C—Fires in electrical equipment.    Class D—Fires in metals such as magnesium, potassium, sodium, titanium, zirconium, powdered aluminum,    zinc, and others which require careful fire attack with special methods and extinguishing agents. Table 7-4.—Fire-fighting Methods. USEFUL EXTINGUISHING COMBUSTIBLE INVOLVED TYPE FIRE                    AGENTS                       Woodwork, bedding, clothing, combustible A 1. Fixed water sprinkling stores 2. High-velocity fog 3. Solid water stream 4. Foam/AFFF 5. Dry Chemical 6. CO₂ Extinguisher Explosive A 1. Magazine sprinkling Propellants 2. Solid water stream or high-velocity fog 3. Foam/AFFF Paint, spirits B 1. CO 2 (Fixed System) Flammable liquid stores 2. Foam/AFFF 3. Installed sprinklers 4. High-velocity fog 5. P-K-P Dry Chemical 6. CO₂ Portable Gasoline B 1. Foam/AFFF, handline or sprinkler systems 2. CO 2 (Fixed System) 3. Water sprinkling system 4.  P-K-P Dry Chemical Fuel oil, JP-5 B 1. Foam/AFFF, handline or sprinkler systems 2. P-K-P Dry Chemical 3. Water sprinkling system 4. High-velocity fog 5. CO₂ (Fixed System) Electrical and radio C 1. (De-energize affected circuits) 2. Portable CO 2 or CO 2 hose reel system 3. High-velocity fog 4. Fog—Foam or Dry Chemical (if CO 2 not    available) Magnesium Alloys D 1. Jettison into the sea 2. High-velocity fog—cool 3. Dry Sand—Talc—Smother Grenades, Napalm D 1. Dry sodium Chloride 2. Stow in kerosene or similar Hydrocarbon The above extinguishing agents are listed in the order of their preferred use for each fire substance. They act in the following manner: (1) Solid Water Stream—wetting, penetrating, and cooling (2) Water Fog—wetting, cooling, and shielding (3) Foam— permanent smothering (4) CO₂—temporary smothering (5) P-K-P Dry Chemical—temporary smothering. 7-11