Yozshusar Typically, exposures conducted according to this practice will produce degradation faster than similar exposures conducted according to Practice D or D and may cause different types of degradation. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Asm. Temperature instability of Historical Version s — view previous versions of standard Translated Version s: A superscript epsilon indicates an editorial change since the last revision or reapproval. Refer also to 9. Summary of Practice 1.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. See Section 9. There is also the possibility of corrosive vapors in theatmospheres over the saturated salt solutions. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.

For more specificsafety precautionary information see 1. Referenced Documents2. Part 1: Saturated Salt and Glycerol Solutions. Summary of Practice4. Significance and Use5. Relative humidity is also an important operatingvariable for the calibration of many species of measuringinstruments. These solutions should befreshly prepared on each occasion of use. Current edition approved April 1, Published July Originallyapproved in Last previous edition approved in as E - 02 United States1resistant, non-hygroscopic material such as glass.

A metal orplastic container is acceptable if the solution is retained in adish or tray made of appropriate material. Refer also to 9.

Reagents and Materials8. Unless otherwiseindicated, it is intended that all reagents conform to thespecifications of the Committee on Analytical Reagents of theAmerican Chemical Society where such specifications areavailable. Hydrated reagents are often preferredto amorphous forms for their solvating characteristics.

See Specification D Technical Precautions9. The vent should be as small as practical tominimize loss of desired equilibrium conditions when in use. Temperature instability of Preparations of Aqueous Solutions Refer to 1. The reference document by Greenspan6contains informationon many other saturated salt solutions which may be used. These additional systems, however, are less accurately or lesscompletely defined in value. Also, some may only be usedwhen freshly prepared to limit the influence of chemicalinstability such as hydrolysis or acid gas absorption.

The saltslisted in Annex A1 can be used for a year or more. Pharmaceutical Convention, Inc. Although a saturated solution systemis defined when any excess quantity of undissolved solute ispresent, it is preferred to keep the excess liquid present to aminimum for ease in handling and for minimal impact onstability should temperature variations occur.

Precision and Bias In actual use, lack of temperature equilibrium Precision is Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.

Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below. Permission rights to photocopy the standard may also be secured from the ASTM website www.


ASTM E104 - 20




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