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ASTM D4940-15(2020)

(Test Method)

Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blast Cleaning Abrasives

Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blast Cleaning Abrasives

SIGNIFICANCE AND USE
4.1 Abrasive media may contain ionic contamination naturally (for example, beach sand), from manufacturing (quenching with contaminated water), transportation, storage or use (in the case of abrasive that is reused). Ionic contamination on the abrasive may transfer to the surface during abrasive blast cleaning, resulting in potential osmotic blistering, accelerated underfilm corrosion and premature coating failure.  
4.2 This test method describes a shop/field procedure for assessing the level of conductive species on an abrasive.  
4.3 Abrasive standards published by SSPC (AB) and ISO 11126 provide tolerance levels for water soluble contaminants of the abrasive.
SCOPE
1.1 This test method describes a procedure for assessing blast cleaning abrasives for the presence of conductive-potential, ionic contaminants by determining the total concentration of water soluble conductive species using a conductivity test.  
1.2 This test method does not identify the ionic species present nor provide quantitative results on each species.  
1.3 This test method is based on a volume comparison among abrasives of similar sizes. A volume comparison is more closely related to surface area of the abrasives than is a weight comparison.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Jan-2020
ICS
25.220.10 - Surface preparation
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.46 - Industrial Protective Coatings
Current Stage
Ref Project

Relations

Referred By
ASTM D7393-16(2020) - Standard Practice for Indicating Oil in Abrasives
Effective Date
01-Feb-2020
Referred By
ASTM D3276-21 - Standard Guide for Painting Inspectors (Metal Substrates)
Effective Date
01-Feb-2020
Referred By
ASTM E3355-23 - Standard Guide for Characterization of Coal Combustion Products (CCPs) in Storage Area(s) for Beneficial Use
Effective Date
01-Feb-2020

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ASTM D4940-15(2020) - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blast Cleaning AbrasivesASTM D4940-15(2020) - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blast Cleaning Abrasives
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ASTM D4940-15(2020) - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blast Cleaning Abrasives
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D4940 −15 (Reapproved 2020)
Standard Test Method for
Conductimetric Analysis of Water Soluble Ionic
1
Contamination of Blast Cleaning Abrasives
This standard is issued under the fixed designation D4940; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Other Standard:
ISO 11127-6Preparation of Steel Substrates beforeApplica-
1.1 This test method describes a procedure for assessing
tion of Paints and Related Products - Test Methods for
blast cleaning abrasives for the presence of conductive-
Non-Metallic Blast CleaningAbrasives - Part 6: Determi-
potential, ionic contaminants by determining the total concen-
nation of Water-Soluble Contaminants by Conductivity
trationofwatersolubleconductivespeciesusingaconductivity
3
Measurement
test.
4
2.3 SSPC: The Society for Protective Coatings:
1.2 This test method does not identify the ionic species
SSPC-AB 1Mineral and Slag Abrasives
present nor provide quantitative results on each species.
SSPC-AB 2Cleanliness of Recycled Ferrous MetallicAbra-
sive
1.3 This test method is based on a volume comparison
among abrasives of similar sizes. A volume comparison is SSPC-AB 3Ferrous Metallic Abrasive
SSPC-AB 4Recyclable Encapsulated Abrasive Media
more closely related to surface area of the abrasives than is a
weight comparison.
3. Summary of Test Method
1.4 The values stated in SI units are to be regarded as
3.1 Abrasive and pure water are combined into a slurry that
standard. No other units of measurement are included in this
is stirred to leach the soluble salts from the abrasive. This
standard.
slurry is filtered and conductance of the filtrate is measured.
1.5 This standard does not purport to address all of the
The conductivity, which is related to the concentration of
safety concerns, if any, associated with its use. It is the
soluble ionic materials contaminating the abrasive, is calcu-
responsibility of the user of this standard to establish appro-
lated from the conductance and the cell constant.
priate safety, health, and environmental practices and deter-
4. Significance and Use
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor-
4.1 Abrasive media may contain ionic contamination natu-
dance with internationally recognized principles on standard-
rally (for example, beach sand), from manufacturing (quench-
ization established in the Decision on Principles for the
ingwithcontaminatedwater),transportation,storageoruse(in
Development of International Standards, Guides and Recom-
the case of abrasive that is reused). Ionic contamination on the
mendations issued by the World Trade Organization Technical
abrasive may transfer to the surface during abrasive blast
Barriers to Trade (TBT) Committee.
cleaning, resulting in potential osmotic blistering, accelerated
underfilm corrosion and premature coating failure.
2. Referenced Documents
4.2 This test method describes a shop/field procedure for
2
2.1 ASTM Standards:
assessing the level of conductive species on an abrasive.
D1193Specification for Reagent Water
4.3 Abrasive standards published by SSPC (AB) and ISO
E832Specification for Laboratory Filter Papers
11126 provide tolerance levels for water soluble contaminants
of the abrasive.
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
5. Apparatus
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
5.1 Conductivity Bridge and Cell—Any commercial con-
Current edition approved Feb. 1, 2020. Published February 2020. Originally
ductivity bridge and conductivity cell typically having a range
ɛ1
approved in 1989. Last previous edition approved in 2015 as D4940–15 . DOI:
10.1520/D4940-15R20.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
the ASTM website. Pittsburgh, PA 15222-4656, http://www.sspc.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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5.2 If there are differences of practical significance between the reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them. As a minimum, test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing. The test results for the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
SCOPE
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1.1.1 The observed attributes of buttons made from plastic and natural materials include: color change, color transfer, solubility, swelling, and loss of finish.  
1.1.2 The observed attributes of buttons made of metal and electroplated buttons include: color change, oxidation, and color transfer.  
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