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ASTM E 104 Document Information:
Title
Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
ASTM International
Publication Date:
Oct 10, 2002
Scope:
This practice describes one method for generating constant
relative humidity (rh) environments in relatively small
containers.
This practice is applicable for obtaining constant relative
humidities ranging from dryness to near saturation at temperatures
spanning from 0 to 50°C.
This practice is applicable for closed systems such as
environmental conditioning containers and for the calibration of
hygrometers.
This practice is not recommended for the generation of
continuous (flowing) streams of constant humidity unless
precautionary criteria are followed to ensure source stability.
(See Section 9.)
Caution—Saturated salt solutions are extremely
corrosive, and care should be taken in their preparation and
handling. There is also the possibility of corrosive vapors in the
atmospheres over the saturated salt solutions.2
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. For more specific safety
precautionary information see 1.5 and 10.1.
2 Opila, R., Jr., Weschler, C. J., and Schubert, R.,
"Acidic Vapors Above Saturated Salt Solutions Commonly Used for
Control of Humidity," IEEE Trans. Components, Hybrids and
Manufacturing Technology, Vol 12, No. 1, March 1989, pp.
114–120.
Keywords:
- aqueous solution
- constant relative humidity
- control of relative humidity
- equilibrium relative humidity
- humidity
- relative humidity
- saturated salt solutions
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