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Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
Automaticky preložený názov:
Štandardné praktiky pre udržiavanie konštantnej relatívnu vlhkosť pomocou vodných roztokov
NORMA vydaná dňa 1.4.2012
Označenie normy: ASTM E104-02(2012)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.4.2012
Kód tovaru: NS-40225
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
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 | ||||||
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. e and rate of degradation and the performance rankings produced by exposures to unfiltered open-flame carbon-arcs can be much different from that produced by exposures to other types of laboratory light sources. Typically, exposures conducted according to this practice will produce degradation faster than similar exposures conducted according to Practice D822 or D5031 and may cause different types of degradation.4.2.2 Interlaboratory comparisons are valid only when all laboratories use the same type of carbon-arc and exposure conditions. 4.3 Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other materials or to a control.4,5 Therefore, exposure of a similar material of known performance (a control) at the same time as the test materials is strongly recommended. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results. 4.4 Test results will depend upon the care that is taken to operate the equipment. Significant factors include regulation of line voltage, freedom from salt or other deposits from water, temperature and humidity control, and conditions of the electrodes. 4.5 All references to exposures in accordance with this practice must include a complete description of the test cycle used. |
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1. Scope | ||||||
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 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 CautionSaturated 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. 1.6 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. |
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2. Referenced Documents | ||||||
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