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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Calculate the cell constant, K25, as follows: Calibration and Standardization 8. 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. This contamination of the abrasive can transfer to the steel surfaces being blasted, where it may accelerate corrosion. The Society for Protective Coatings, 40 24th St. NOTE 3β€”In general the cell constant is not greatly affected by variations in the adtm of the KCl solution, but, for greater accuracy, measurements should be made at or near the speci?

A typical value for a low level of contamination is 50?

Your astk will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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. This test is useful in establishing the cleanliness of the abrasive at dd4940 jobsite.

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Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. NOTE 1β€”A typical value of conductivity for a high level of contamination is awtm Thus, it provides an indication of ionic corrosion potential.

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

A Micro Mho Per Centimetre 1?

Precision and Bias 7 The ASTM method allows a user to measure a loose packed volume of abrasive and mix that abrasive with an equal volume of reagent water. 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. 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.

Reagents and Materials 6. A volume comparison is more closely related to surface area of the abrasives than is a weight comparison. However, slags quenched with seawater or other contaminated water, contain high amounts of ionic material as does seashore sand. Let stand for 8 min and then stir again for 1 min.

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. Another method is to stir the solution with a clean thermometer while the d4490 is warmed or cooled by an external source.

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That is, high conductivity due to a lower pH of the contamination would normally indicate greater corrosion potential. Last previous edition approved in as D – Abrasives that showed qualifying extracted salts using astk ISO Procedure also showed qualifying extracted salt levels as speci?

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. Converting from one unit base to another is not useful as the two methods differ in process. 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.

Elcometer 138 Abrasive Soluble Salt Test Kit – ASTM D4940

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Atsm Digital Surface Profile Gauge Digital, fast and accurate surface profile inspection on flat and curved surfaces. The ASTM method is well suited for use in the? Summary of Test Method 3.

Method to Method Comparison: The resulting slurry is allowed to settle and the filtered water can then be tested using a conductivity meter. A superscript epsilon e indicates an editorial change since the last revision or reapproval.