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TM 10-6640-233-10 1-9. Extinguishing Fires.  Be familiar with the nature of petroleum fires; with procedures for fighting fires; and with the fire extinguishing equipment in the laboratory.  Do not use water for extinguishing oil fires because it will spread the fire.  Also, water is a conductor of electricity and should not be used on electrical fires. 1-10. Handling  Chemicals.   The  following  safety  precautions  need  to  be  observed  by  all  personnel  while  handling chemicals. ·    Store heavy and large containers of chemicals on or as near the floor as possible. ·    Never  fill  a  container  with  materials  other  than  that  indicated  on  the  label.    Make  sure  that  every  container  is properly labeled. ·    Never place bottles containing acids or alkalis on high shelves or on top of equipment. ·    Always  wear  goggles  when  breaking  up  solid  chemicals  which  might  chip,  or  when  handling  quantities  of corrosive liquids such as strong acids and strong bases. ·    When opening new bottles of acid, always wear goggles. ·    When pouring a sample from a container, hold the container cap or stopper in the hand.  Never place the cap or stopper on a counter where it may come in contact with a contaminating agent. ·    Always wipe up any acid that spills or splashes on benches, tables, or floors. ·    If  any  chemical  is  spilled  or  splashed  on  the  body,  immediately  wash  the  contaminated  area  thoroughly  with water. ·     Keep  all  sample  containers  that  are  in  use  capped  or  stoppered  at  all  times  except  when  pouring  out  test portions.  Always replace the same cap or stopper in the container from which it was removed. ·     Never handle mercury with bare hands; never heat mercury in an open container; and never shake more than 20 milliliters of mercury in a glass container.     Never  taste  laboratory  chemicals.    Smell  a  chemical  only  when  necessary  and  then  only  by  wafting  a  small amount of vapor with the hand toward the nose. · Dispose of all unlabeled chemicals. 1-11. Controlling  Pressure  and  Vacuum.   The  following  safety  precautions  should  be  observed  by  all  personnel while operating the air/vacuum systems. · Do not use faulty copper, plastic, or rubber tubing when performing operations requiring pressure or vacuum. · Make sure that glass vacuum apparatus is properly shielded when it is in use. ·Always wear goggles when opening air valves that are close to the face. 1-3


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