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to. turn thc etisr at the stockrooni so that it be refilled immediately. If the carbon dioxide ( fire, evacuate the laboratoiy and call the fire department Carbon dioxide fire extinguishers must not be used on fires involving magnesium or certain other reactive metals, since carbon dioxide may react vigorously with the burning metal and make the fire worse.

Figure 3. A typical carbon dioxide fire extinguisher. Pull the metal ring to activate the extinguisher.

One of the most frightening and potentially tragic accidents is the igniting of a person’s clothing. For this reason, certain types of clothing are riot appropriate for the laboratory and must not be worn. Since sleeves are most likely to come in closest proximity to flames, any garment that has builcy or loose sleeves should not be worn in the laboratory. Certain fabrics should also be avoided; such substances as silk and certain synthetic materials may be highly flammable. Ideally, students should wear laboratory coats with lightly fitting sleeves made specifically for the chemistiy laboratory. This clothing may be required by your pailicular coilege or university. Long hair also presents a clear danger if it is allowed to hang loosely in the vicinity of the flame. Long hair must be pinned back or held with a rubber band. In the unlikely event a student’s clothing or hair is ignited, his or her neighbors must take prompt action to prevent severe burns. Most have two options for eain guishing suchfires: the water shower and the . Figure 4 shows a typical laboma tory emergency water shower.

Figure 4. Laboratory emerg.ency shower. Use the shower to extinguish clothing fires and in the event of a large-scale chemical spill.

Copyright © Houghton Mifflin Co. All rights reserved xx

Protection

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Cleaning

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to xv