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Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions (Includes all amendments and changes 12/21/2020).Přeložit název
NORMA vydána dne 1.11.2020
Označení normy: ASTM E104-20a
Datum vydání normy: 1.11.2020
Kód zboží: NS-1013210
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
aqueous solution, constant relative humidity, control of relative humidity, equilibrium relative humidity, humidity, relative humidity, saturated salt solutions,, ICS Number Code 19.040 (Environmental testing)
|Significance and Use|
5.1Standard 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.
1.1This practice describes one method for generating constant relative humidity (rh) environments in relatively small containers.
1.2This practice is applicable for obtaining constant relative humidities ranging from dryness to near saturation at temperatures spanning from 0 C to 50 C.
1.3This practice is applicable for closed systems such as environmental conditioning containers and for the calibration of hygrometers.
1.4This 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.)
1.5The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6WarningSaturated 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.1.7This 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. 1.8This 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.
|2. Referenced Documents|
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