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ASTM D4940 PDF

ASTM D standard describes the conductivity test used to assess the presence of ASTM D test method consists in combining equivalent volumes of. ASTM D – Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contaminatio. ASTM D Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blast Cleaning Abrasives.

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The Elcometer Abrasive Soluble Salt Test Kit provides all that is needed to carry out the test in the field or in the laboratory. NOTE 1β€”A typical value of conductivity for a high level of contamination is ?

Summary of Test Method 3.

This constant should be checked periodically, one method being as follows: There was no direct correlation possible between numerical results obtained and reported by the two different methods. The conversion factor from?

NOTE 3β€”In general the cell constant is not d4904 affected by variations in the strength of the KCl solution, but, for greater accuracy, measurements should be made at or near the speci? Converting from one unit base to another is not useful as the two methods differ in process. Elcometer E Conductivity Meter An entry level conductivity meter, is ideal for measuring soluble salt concentration and electric conductivity EC of solutions.

However, the bias introduced by this factor is in the proper direction. The ASTM method is well suited for use in the? The ISO method is well suited to use in axtm laboratory setting but is poorly suited to use d494 the? Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

Elcometer Abrasive Soluble Salt Test Kit – ASTM D

Abrasives used for blast cleaning surfaces can be contaminated with soluble salts due to the source or the re-use of the blasting media.

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That is, high conductivity due to a lower pH of the contamination would normally indicate greater corrosion potential. Originally approved in Last previous edition approved in as D – This contamination can be transferred to the blast cleaned surface and result in accelerated corrosion conditions and also cause premature coating failure, if this contamination is not removed prior to applying the coating.

Another method is to stir the solution with a clean thermometer while the vessel is warmed or cooled by an external source. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Elcometer E Conductivity Meter, ml If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Let stand for 8 min and then stir again for 1 min. Method to Method Comparison: An independent study by SSPC showed that the relative order of extracted salts using each type of procedure on abrasive materials was identical.

Elcometer Inc, Michigan Office Relocation. Calculate the cell constant, K25, sstm follows: This contamination of the abrasive can transfer to the steel surfaces being blasted, where it may accelerate corrosion.

Elcometer 138 Abrasive Soluble Salt Test Kit – ASTM D4940

It differs from this test method in two major areas: 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. Current edition approved January 10, A means of adjusting for temperature or controlling the temperature is essential. Use successive portions of the sample until a constant value is obtained. Thus, it provides an indication of ionic corrosion potential.

A volume comparison is more closely related to surface area of the abrasives than is a weight comparison. In the ASTM Method the weight of the abrasive is not known; this makes it impossible to assess the ratio between conductivity values determined using this test method procedure and those determined using the ISO procedure.

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Elcometer Digital Surface Profile Gauge Digital, fast and accurate surface profile inspection on flat and curved surfaces. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Precision and Bias 7 This 1 This speci?

The conductivity, which is related to the concentration of soluble ionic materials contaminating the abrasive surface, is calculated axtm the conductance and the cell constant. A typical atm for a low level of contamination is 50?

The reader is warned that it is difficult to make direct comparisons between the results of these two different methods of analysis. The ASTM method allows a user to measure a loose f4940 volume of abrasive and mix that abrasive with an equal volume of reagent water.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Either a dip-type, pipet-type, or cup-type cell may be used. Abrasives that showed qualifying extracted salts astn the ISO Procedure also showed qualifying extracted salt levels as speci?

The ranked order correlation between the two methods was unity. Calibration and Standardization 8. This test is useful in establishing the cleanliness of the abrasive at the jobsite. Unless otherwise indicated, it is intended that all reagents conform to the speci?

Reagents and Materials 6. The Society for Protective Coatings, 40 24th St. A Micro Mho Per Centimetre 1? A number in parentheses indicates the year of last reapproval.