text: The principle of the test is simple: 
  •	A defined amount of distilled or deionized water is poured into the floor pan of the test chamber. 
  •	The samples are placed in the chamber above the water level. The door or hood of the chamber is tightly closed and hermetically sealed for safety. 
  •	A fixed volume of sulfur dioxide is introduced into the chamber, usually either 1 L (0.33%) or 2 L (0.66%) Volume of SO. 
  The test is performed in two sections, 
  o	Test section 1: 8 hours warm-up to 40±3 °C (relative humidity 100%)
  o	Test section 2: 16 hours cooling to 18 to 28 °C (relative humidity max. 75 %)
  The test is usually carried out in cycles of 24 hours each.
  Caution: The atmosphere containing sulfur dioxide must not be released into the room air.