Environment, health and safety

In handling isopropyl alcohol (IPA), used for drying and cleaning wafers, which property requires particular care?

  1. AIt explodes on contact with water
  2. BIts flash point is low, so it can ignite from a spark or the like even at room temperature
  3. CIt emits strong radiation
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Answer: B. Its flash point is low, so it can ignite from a spark or the like even at room temperature

IPA has a flash point of about 12 °C, so it gives off flammable vapor even at room temperature, which can be ignited by sparks, electrostatic discharge and the like. It is therefore handled with good ventilation, away from ignition sources, and with containers and equipment grounded. Storage quantities are also regulated by law.

  • A. IPA mixes readily with water and does not explode on contact with it.
  • B. Correct. It is handled as a flammable liquid.
  • C. IPA is not radioactive.
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