Ik blijf dus van mening dat water en CO2 niet geschikt zijn.
Zoals jij ons hier op het forum vaak zegt (en ook doet), moet je niet iets roepen zonder onderbouwing is.
Bij deze dus:
Wiley Guide to Chemical Incompatibilities, 3rd ed.MAGNESIUM SHEET or MAGNESIUM TURNINGS (7439-95-4) Mg
Combustible solid (autoignition temp for turnings and shavings: <883 degr.F/473 degr.C; lower for finer forms, affected by the presence of moisture).
Finely divided material forms explosive mixtures with air; may ignite spontaneously in moist air. Finely divided material, or flakes, very thin sheet material, etc., reacts with water, steam, acid fumes, forming flammable hydrogen; the mixture is explosive. All forms, including bulk, react with acids, forming flammable hydrogen gas. A strong reducing agent.
Violent reaction with ammonia, oxidizers, sulfates, beryllium fluoride, boron diiodophosphide, copper sulfide, 1,1-dibromoethane, hydriodic acid, hydrogen iodide, oxygen difluoride, silver nitrate, and many other materials. Dusts, powders or finely divided material form heat-, friction-, or shock-sensitive explosive mixtures with acetylene compounds (forms magnesium acetylide), alkynes, ammonium nitrate, barium nitrate, barium peroxide, methyl alcohol (forms high explosive), red phosphorus, sodium peroxide.
Incompatible with many substances including acids, cadmium dicyanide, cadmium oxide, carbon dioxide, carbon tetrachloride, carbonates, chloroformamidinium nitrate, chloroform, copper compounds, ethylene oxide, fused nitrates, gold cyanide, halogens, halocarbons, interhalogens, iron oxide, lead compounds, mercury cyanide, metal oxides, 4,4'-methylene bis (2-chloroaniline), molybdenum trioxide, nickel cyanide, nitrogen, perchlorates, phosphates, potassium carbonate, rusted steel, silver nitrate, sodium nitrate, sodium peroxide, silicon dioxide, sulfur, powdered Teflon® (spontaneously combustable), tellurium, titanium dioxide, trichloroethylene. Follow supplier's MSDS for specific storage recommendations.
On fires use only approved Class D extinguishers (e.g., Met-LX® or Lith-X®, or smother with special powders (G-1), powdered talc, dry sand, dry clay, crushed limestone, dry graphite. Lith-X® type dry powders may also be used.Hazmat Data: For First Response, Transportation, Storage, And Security, pag. 682. (Wiley 2004), MAGNESIUM REC. M:0100
SYNONYMS: EEC No. 012-002-00-9; MAGNESIO (Spanish)
CAS Number: 7439-95-4, Formula: Mg
DOT ID Number: UN 1418 (powder); UN 1869 (pellets); UN 2950 (granules, coated); DOT Guide Number: 138
Proper Shipping Name: Magnesium powder or Magnesium alloys, powder (UN 1418); Magnesium or Magnesium alloys, with more than 50% magnesium in pellets, turnings, or ribbons (UN 1869); Magnesium granules, coated.
DESCRIPTION Silvery-white (looks like aluminum, but is much lighter weight) solid. Odorless. Sinks in water; insoluble. Finely divided forms reacts with water producing explosive hydrogen gas.
Combustible solid.
Do NOT use water or water-based extinguishers Dust or other finely divided form (thin sheets, turnings, chips, pellets, or ribbons) are easily ignited and burn with intense white flame. Highly reactive with many materials.
Containers may BLEVE when exposed to fire Concentrated dust in confined areas (e.g., tanks, sewers, buildings) may explode when exposed to fire. Irritating to the skin, eyes, and respiratory tract. Toxic products of combustion may include magnesium metal fume. Note: Eye damage can be caused by looking directly at intense white flame.
Hazard Classification (based on NFPA-704M Rating System)Health Hazards (Blue): 0; Flammability (Red): 1; Reactivity (Yellow): 1; Special Notice (White): Water reactive (finely divided forms)
FIRE DATA
Fire extinguishing agents not to be used: Water, foam, halogenated agents, CO2.Sax's Dangerous Properties of Industrial Materials, 11th ed., 2004, pag. 2264SAFETY PROFILE: Inhalation of dust and fumes can cause metal fume fever. The powdered metal ignites readily on the skin causing burns. Particles embedded in the skin can produce gaseous blebs that heal slowly. A dangerous fire hazard in the form of dust or flakes when exposed to flame or oxidizing agents. In solid form, magnesium is difficult to ignite because heat is conducted rapidly away from the source of ignition; it must be heated above its melting point before it will burn. However, in finely divided form, it may be ignited by a spark or the flame of a match. Magnesium fires do not flare up violently unless there is moisture present. Therefore, it must be kept away from water, moisture, etc. It may ignited spontaneously when the material is finely divided and damp, particularly with water-oil emulsion.
Moderately explosive in the form of dust when exposed to flame. Also, magnesium reacts with moisture, acids, etc., to evolve hydrogen, a highly dangerous fire and explosion hazard.
To fight fire, operators and firefighters can approach a magnesium fire to within a few feet if no moisture is present.
Water and ordinary extinguishers, such as CO2, carbon tetrachloride, etc., should not be used on magnesium fires. G-1 powder or powdered talc should be used on open fires. Dangerous when heated; burns violently in air and emits fumes; will react with water or steam to produce hydrogen.
https://cameochemicals.noaa.gov/chemical/6949Response Recommendations
Firefighting
Fire Extinguishing Agents Not to Be Used: Water, foam, halogenated agents, carbon dioxide.Fire Extinguishing Agents: Inert dry powders (e.g., graphite, limestone, salt) (USCG, 1999)
