ASTM D4940 PDF

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

Precision and Bias 7 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 asgm be made at or near the speci?

Asmt Inc, Michigan Office Relocation. Calibration and Standardization 8. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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? A number in parentheses indicates the year of last reapproval. The Elcometer Abrasive Soluble Salt Test Kit provides all that is needed to carry out the test in the field or in the laboratory.

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It differs from d9440 test method in two major areas: The ISO method is well suited to use in a laboratory setting but is poorly suited to use in the? However, slags quenched with seawater or other contaminated water, contain high amounts of ionic material as does seashore sand.

When no markings distinguishing between units of production appear, take samples from the different packages in 8. Summary of Test Method 3. This constant should be checked periodically, one method being as follows: NOTE 1β€”A typical value of conductivity for a high level of contamination is ?

Elcometer Abrasive Soluble Salt Test Kit – ASTM D

Let stand for 8 min and then astj again for 1 min. 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. Originally approved in Current edition approved January 10, Either a dip-type, pipet-type, or cup-type cell may be used. A volume comparison is more closely related to surface area of the abrasives than is a weight comparison.

The ASTM method allows a user to measure a loose packed volume of abrasive and mix that x4940 with an equal volume of reagent water.

The ranked order correlation between the two methods was unity. 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.

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Elcometer 138 Abrasive Soluble Salt Test Kit – ASTM D4940

It is the responsibility of the user of this standard to establish 4d940 safety and health practices and determine the applicability of regulatory limitations prior to use. A superscript epsilon d4490 indicates an editorial change since the last revision or reapproval.

A typical value for a low level of contamination is 50? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

The conversion factor from? Reagents and Materials 6.

This contamination of the abrasive can transfer to the steel surfaces being blasted, where it may accelerate corrosion. A means of adjusting for temperature or controlling the temperature is essential. Converting from one unit base to another is not useful as the two methods differ in process.

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