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ASTM E104-20a

Current Revision

Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions

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1.1 This practice describes one method for generating constant relative humidity (rh) environments in relatively small containers.

1.2 This practice is applicable for obtaining constant relative humidities ranging from dryness to near saturation at temperatures spanning from 0 °C to 50 °C.

1.3 This practice is applicable for closed systems such as environmental conditioning containers and for the calibration of hygrometers.

1.4 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.)

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 Warning—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

1.7 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For more specific safety precautionary information see 1.6 and 10.1.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 Standard value relative humidity environments are important for conditioning materials in shelf-life studies or in the testing of mechanical properties such as dimensional stability and strength. Relative humidity is also an important operating variable for the calibration of many species of measuring instruments.

SDO ASTM: ASTM International
Document Number E104
Publication Date Nov. 1, 2020
Language en - English
Page Count 5
Revision Level 20a
Supercedes
Committee D22.11
Publish Date Document Id Type View
Nov. 1, 2020 E0104-20A Revision
March 1, 2020 E0104-20 Revision
Oct. 10, 2002 E0104-02 Revision
April 1, 2012 E0104-02R12 Reaffirmation
Oct. 1, 2007 E0104-02R07 Reaffirmation
Jan. 1, 1996 E0104-85R96 Reaffirmation