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 number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last dd4940 or reapproval. A volume comparison is more closely related to surface area of the abrasives than is a d49400 comparison.
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.
Summary of Test Method 3. This 1 This speci?
Current edition approved January 10, Originally approved in Last previous edition approved in as D – The Society for Protective Coatings, 40 24th St. The conductivity, which is related to the concentration of soluble ionic materials asmt the abrasive surface, is calculated from the conductance and the cell constant.
However, slags quenched with seawater or other contaminated water, contain high amounts of ionic material as does seashore sand. This contamination of the abrasive can transfer to the steel surfaces being blasted, where it may accelerate corrosion.
This test is useful in establishing the cleanliness of the abrasive at the jobsite.
Thus, it provides an indication of ionic corrosion potential. NOTE 1—A typical value of conductivity for a high level of contamination is ? A typical value for a low level of contamination is 50?
Either a dip-type, pipet-type, or cup-type cell may be used. 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.
It differs from this test method in two major areas: 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.
The ISO method is well suited to use in a laboratory setting but is poorly suited asym use in the? The ASTM method is well suited for use in the? Method to Method Comparison: The reader is warned that it is difficult to make direct comparisons between the results of these two different methods wstm analysis.
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.
An independent study by SSPC showed that the relative order of extracted salts using each asym of procedure on abrasive materials was identical. The ranked order correlation between the two methods was unity.
Elcometer 138 Abrasive Soluble Salt Test Kit – ASTM D4940
There was no direct correlation possible astj numerical results obtained and reported by the two different methods. Abrasives that showed qualifying extracted salts using the ISO Procedure also showed qualifying extracted salt levels as speci? Converting from one unit base to another is not useful as the two methods differ in process.
The conversion factor from? A Micro Mho Per Centimetre 1? Test the samples separately.
Elcometer Abrasive Soluble Salt Test Kit – ASTM D
Calibration and Standardization 8. This constant should be checked periodically, one method being as follows: Calculate the cell constant, K25, as follows: NOTE 3—In general the cell constant is not greatly affected by variations in the strength of the KCl solution, but, for greater accuracy, axtm should be made at or near the speci?
Reagents and Materials 6. Unless otherwise indicated, it is intended that all reagents conform to the speci? When no markings distinguishing between units of production appear, take samples from the different packages in 8. Let stand for 8 min and then stir again for 1 min.
The amount of supernatant liquid? Use successive portions of the sample until a constant value is obtained. Precision and Bias 7 However, the bias introduced by this factor is in the proper direction.
That is, high conductivity due to r4940 lower pH of the contamination would normally indicate greater corrosion potential.
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