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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A measured volume of the abrasive d4490 mixed with the same volume of water and agitated to allow any soluble salts to dissolve in the water.

Elcometer Abrasive Soluble Salt Test Kit – ASTM D

There was no direct correlation possible between numerical results obtained and reported by the two different methods. Let stand for 8 min and then stir again for 1 min. The ISO method is well suited to use in a laboratory setting but is poorly suited to use in the?

This 1 This speci? Converting from one unit base to another is not useful as the two methods differ in process.

Abrasives that showed qualifying extracted salts using the ISO Procedure also showed qualifying extracted salt levels as speci?

Reagents and Materials 6. Originally approved in Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

Elcometer 138 Abrasive Soluble Salt Test Kit – ASTM D4940

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Use successive portions of the sample until a constant value is obtained. The Elcometer Abrasive Soluble Salt Test Kit provides all that is needed to carry out the test in the field or in the laboratory. When no markings distinguishing between units of production appear, take samples from the different packages in 8.

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It differs from this test method in two major areas: An independent study by SSPC showed that the relative order d4904 extracted salts using each type of procedure on abrasive materials was identical. The conversion factor from?

Precision and Bias 7 This test is useful in establishing the cleanliness of the abrasive at the jobsite. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

A means of adjusting for temperature or controlling the temperature is essential. Another method is to stir the solution with a clean thermometer while the vessel is warmed or cooled by an external source.

Method to Method Comparison: A volume comparison is more closely related to surface area of the abrasives than is a weight comparison. 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.

This contamination of the abrasive can transfer to the steel surfaces being blasted, where it may accelerate corrosion. Abrasives used for blast cleaning surfaces can wstm contaminated with soluble salts due to the source or the re-use of the blasting media. This standard is subject to revision at any time by the responsible technical committee xstm 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.

This constant should be checked periodically, one method s4940 as follows: A Micro Mho Per Centimetre 1? 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. The Society for Protective Coatings, 40 24th St.

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Elcometer E Conductivity Meter An entry level conductivity meter, is ideal for measuring soluble salt concentration and electric conductivity EC of solutions. However, slags quenched with seawater or other contaminated water, contain high amounts of ionic material as does seashore sand.

Summary of Test Method 3. The ASTM method is well suited for use in the? 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. d44940

However, the bias introduced by this factor is in the proper direction. Thus, it provides an indication of ionic corrosion potential.

Elcometer Digital Surface Profile Gauge Digital, fast and accurate surface profile inspection on flat and curved surfaces. Calibration and Standardization 8. 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. Elcometer E Conductivity Meter, ml Unless otherwise indicated, it is intended that all reagents conform to the speci?

Elcometer Bresle Salt Kit A range of products to test the level of contaminants on the surface. Test the samples separately. The amount of supernatant liquid? The reader is warned that it is difficult to make direct comparisons between the results of these two different methods of analysis.

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