ASTM D4940 PDF

  • July 2, 2019

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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Calibration and Standardization 8. This test is useful in establishing the cleanliness of the abrasive at asm jobsite. The ISO method is well suited to use in a laboratory setting but is poorly suited to use in the? The reader is warned that it is difficult to make direct comparisons between the results of these two different methods of analysis.

A measured volume of the abrasive is mixed with the same volume of water and agitated to allow any soluble salts to dissolve in the water.

Calculate the cell constant, K25, as follows: NOTE 1β€”A typical value of conductivity for a high level of contamination is ? Method to Method Comparison: Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

The amount of supernatant liquid? Elcometer E Conductivity Meter An entry level conductivity meter, is ideal for measuring soluble salt concentration and electric conductivity EC of solutions.

Elcometer Abrasive Soluble Salt Test Kit – ASTM D

If you feel that your comments have not received a fair hearing e4940 should make your views known to the ASTM Committee on Standards, at the address shown below. 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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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. Test the samples separately. Elcometer Inc, Michigan Office Relocation. Abrasives used for blast cleaning surfaces can be contaminated with soluble salts due to the source or the re-use of the blasting media. However, the bias introduced by this factor is in the proper direction.

The Elcometer Abrasive Soluble Salt Test Kit provides all that is needed to carry out the test in the field or in the laboratory. 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. A means of adjusting for temperature or controlling the temperature is essential.

NOTE 3β€”In general the cell constant is not greatly affected by variations in the strength of the KCl solution, but, for greater accuracy, measurements should be made at or near the speci? Unless otherwise indicated, it is intended that all reagents conform to the speci?

Thus, it provides an indication of ionic corrosion potential. Another method is to stir the solution with a clean thermometer while the vessel is warmed or cooled by an external source. Either asm dip-type, pipet-type, or cup-type cell may be used. The resulting slurry is allowed to settle and the filtered water can then be tested using a conductivity meter.

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Elcometer 138 Abrasive Soluble Salt Test Kit – ASTM D4940

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The conductivity, which is related to the concentration of soluble ionic materials contaminating the abrasive surface, is calculated from the conductance and the cell constant. The conversion factor from? It differs from this test method in two major areas: An independent study by SSPC showed that the relative order of extracted salts using each type of procedure on abrasive materials was identical.

Let stand for 8 min and then stir again for 1 min.

Elcometer E Conductivity Meter, ml Originally approved in Precision and Bias 7 Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. A Micro Mho Per Centimetre 1? This aatm of the abrasive can transfer to the steel surfaces being blasted, where it may accelerate corrosion.

This constant should be checked periodically, one method being as follows: Elcometer Digital Surface Profile Gauge Digital, fast and accurate surface profile inspection on flat and curved surfaces. A volume comparison is more closely related to surface area of the abrasives than is a weight comparison.