- Water extinguishers (not pictured and not found in laboratories) are suitable for class A (paper, wood etc.) fires, but not for class B, C and D fires such as burning liquids, electrical fires or reactive metal fires. In these cases, the flames will be spread or the hazard made greater! Water mist extinguishers are suitable for class A and C; see below.
- Dry chemical extinguishers are useful for either class ABC or class BC fires (check the label) and are your best all around choice for common fire situations. They have an advantage over CO2 and "clean agent" extinguishers in that they leave a blanket of non-flammable material on the extinguished material which reduces the likelihood of reignition. They also make a terrible mess - but if the choice is a fire or a mess, take the mess! Note that there are two kinds of dry chemical extinguishers:
- Type BC fire extinguishers contain sodium or potassium bicarbonate.
- Type ABC fire extinguishers contain ammonium phosphate.
- CO2 (carbon dioxide) extinguishers are for class B and C fires. They don't work very well on class A fires because the material usually reignites. CO22 is a bad choice for a flammable metal fires such as Grignard reagents, alkyllithiums and sodium metal because CO2 extinguishers are not approved for class D fires! extinguishers have an advantage over dry chemical in that they leave behind no harmful residue. That makes carbon dioxide (or Halotron I or FE-36; see below) a good choice for an electrical fire involving a computer or other delicate instrument. Note that CO reacts with these materials. CO
- Metal/Sand Extinguishers are for flammable metals (class D fires) and work by simply smothering the fire. The most common extinguishing agent in this class is sodium chloride, but there are a variety of other options. You should have an approved class D unit if you are working with flammable metals. The following types of class D extinguishing units are available through our on-line store, Safety Emporium.
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