CH77: Ammonium Hydroxide coefficient of expansionCategory: Product Specific | Updated: 1/3/2007 2:22:42 PM | Owner: Donna M. Long | Read: 844 (Last: 9/7/2010 4:13:21 AM)
Description Bulging or collapsing of ammonium hydroxide (ammonia) packages is normal and no cause for alarm
DetailAqua ammonia solutions at 28 - 29% concentration boil around 85 deg F at atmospheric pressure. Strong aqua ammonia solutions have very large coefficients of expansion which are temperature dependent. The vapor pressure in the container is directly proportional to the temperature change. Puritan fills ammonium hydroxide at 70 deg F. So, if the container is filled at 70 deg F and the temperature rises to 90 deg F, the container will bulge. Likewise, if the same container is subjected to 50 deg F, the container will collapse. To correct the physical condition of the container: (1) Put on the appropriate PPE (rubber apron, chemical splash goggles, gloves, etc.) (2) Place the container opening within close proximity to a point exhaust source and (3) carefully open one of the 2" bungs to equalize the pressure.
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