ASTM D4940-10

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

SIGNIFICANCE AND USE
By-product abrasives manufactured from slags that are air cooled or quenched with pure water, normally contain low concentrations of ionic materials, as do mined mineral abrasives. 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.  
This test method provides a value that indicates the concentration of total water soluble ions based on their electrolytic mobility. Thus, it provides an indication of ionic corrosion potential.
Note 1—A typical value of conductivity for a high level of contamination is 500 μmho/cm. A typical value for a low level of contamination is 50 μmho/cm.
SCOPE
1.1 This test method describes a procedure for rapid evaluation of abrasives for the presence of ionic contamination by determining the total concentration of water soluble ionic contaminants by means of 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-May-2010
• ICS: 25.220.10 - Surface preparation
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.46 - Industrial Protective Coatings

Relations

• Replaces: ASTM D4940-98(2003) - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blasting Abrasives
• Effective Date: 01-Jun-2010
• Referred By: ASTM F941-99(2019) - Standard Practice for Inspection of Marine Surface Preparation and Coating Application
• Effective Date: 01-Jun-2010
• Referred By: ASTM D5498-12a(2018) - Standard Guide for Developing a Training Program for Personnel Performing Coating and Lining Work Inspection for Nuclear Facilities
• Effective Date: 01-Jun-2010
• Referred By: ASTM D7393-16(2020) - Standard Practice for Indicating Oil in Abrasives
• Effective Date: 01-Jun-2010
• Referred By: ASTM E3355-23 - Standard Guide for Characterization of Coal Combustion Products (CCPs) in Storage Area(s) for Beneficial Use
• Effective Date: 01-Jun-2010
• Referred By: ASTM D7055-19 - Standard Practice for Preparation (by Abrasive Blast Cleaning) of Hot-Rolled Carbon Steel Panels for Testing of Coatings
• Effective Date: 01-Jun-2010
• Referred By: ASTM D3276-21 - Standard Guide for Painting Inspectors (Metal Substrates)
• Effective Date: 01-Jun-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D4940 −10
StandardTest Method for
Conductimetric Analysis of Water Soluble Ionic
1
Contamination of Blasting 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 2.3 SSPC: The Society for Protective Coatings
4
SSPC-AB 1Specification for Mineral and Slag Abrasives
1.1 This test method describes a procedure for rapid evalu-
ation of abrasives for the presence of ionic contamination by
3. Summary of Test Method
determining the total concentration of water soluble ionic
3.1 Abrasive and pure water are combined into a slurry that
contaminants by means of a conductivity test.
is stirred to leach the soluble salts from the abrasive. This
1.2 This test method does not identify the ionic species
slurry is filtered and conductance of the filtrate is measured.
present nor provide quantitative results on each species.
The conductivity, which is related to the concentration of
1.3 This test method is based on a volume comparison
soluble ionic materials contaminating the abrasive surface, is
among abrasives of similar sizes. A volume comparison is calculated from the conductance and the cell constant.
more closely related to surface area of the abrasives than is a
4. Significance and Use
weight comparison.
4.1 By-product abrasives manufactured from slags that are
1.4 The values stated in SI units are to be regarded as
air cooled or quenched with pure water, normally contain low
standard. No other units of measurement are included in this
concentrations of ionic materials, as do mined mineral abra-
standard.
sives. However, slags quenched with seawater or other con-
1.5 This standard does not purport to address all of the
taminated water, contain high amounts of ionic material as
safety concerns, if any, associated with its use. It is the
does seashore sand. This contamination of the abrasive can
responsibility of the user of this standard to establish appro-
transfer to the steel surfaces being blasted, where it may
priate safety and health practices and determine the applica-
accelerate corrosion. This test is useful in establishing the
bility of regulatory limitations prior to use.
cleanliness of the abrasive at the jobsite.
2. Referenced Documents
4.2 This test method provides a value that indicates the
2
concentration of total water soluble ions based on their
2.1 ASTM Standards:
electrolytic mobility. Thus, it provides an indication of ionic
D1193Specification for Reagent Water
corrosion potential.
E832Specification for Laboratory Filter Papers
2.2 Other Standard:
NOTE 1—A typical value of conductivity for a high level of contami-
ISO 11127-6Preparation of Steel Substrates beforeApplica- nation is 500 µmho/cm. A typical value for a low level of contamination
is 50 µmho/cm.
tion of Paints and Related Products - Test Methods for
Non-Metallic Blast CleaningAbrasives - Part 6: Determi-
5. Apparatus
nation of Water-Soluble Contaminants by Conductivity
3
5.1 Conductivity Bridge and Cell—Any commercial con-
Measurement
ductivity bridge and conductivity cell typically having a range
ofatleast5µmho/cmto10000µmho/cmissatisfactory.Either
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
a dip-type, pipet-type, or cup-type cell may be used. A means
and Related Coatings, Materials, andApplications and is the direct responsibility of
of adjusting for temperature or controlling the temperature is
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved June 1, 2010. Published June 2010. Originally essential. While some instruments have an adjustment to
approved in 1989. Last previous edition approved in 2003 as D4940-98(2003).
compensate for temperature (automatic temperature
DOI: 10.1520/D4940-10.
compensation), one means is to use a 25°C constant tempera-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ture bath.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3 4
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
4th Floor, New York, NY 10036, http://www.ansi.org. 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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D4940−10
Anothermethodistostirthesolutionwithacleanthermometer
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D4940–98(Reapproved2003) Designation: D4940 – 10
Standard Test Method for
Conductimetric Analysis of Water Soluble Ionic
1
Contamination of Blasting 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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method describes a procedure for rapid evaluation of abrasives for the presence of ionic contamination by
determining the total concentration of water soluble ionic contaminants by means of 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.Avolume comparison is more closely
related to surface area of the abrasives than is a weight comparison.
1.4
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
E832 Specification for Laboratory Filter Papers
2.2 Other Standard:
ISO11127-6 PreparationofSteelSubstratesbeforeApplicationofPaintsandRelatedProducts-TestMethodsforNon-Metallic
3
Blast Cleaning Abrasives - Part 6: Determination of Water-Soluble Contaminants by Conductivity Measurement
2.3 SSPC: The Society for Protective Coatings
4
SSPC-AB 1 “Specification for Mineral and Slag Abrasives
3. Summary of Test Method
3.1 Abrasive and pure water are combined into a slurry that is stirred to leach the soluble salts from the abrasive. This slurry
is filtered and conductance of the filtrate is measured. 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.
4. Significance and Use
4.1 By-product abrasives manufactured from slags that are air cooled or quenched with pure water, normally contain low
concentrations of ionic materials, as do mined mineral abrasives. 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.
4.2 This test method provides a value that indicates the concentration of total water soluble ions based on their electrolytic
mobility. Thus, it provides an indication of ionic corrosion potential.
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved Jan. 10, 2003. Published March 2003. Originally approved in 1989. Last previous edition approved in 1998 as D4940-98. DOI:
10.1520/D4940-98R03.
Current edition approved June 1, 2010. Published June 2010. Originally approved in 1989. Last previous edition approved in 2003 as D4940 - 98 (2003). DOI:
10.1520/D4940-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor, 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

---------------------- Page: 1 ----------------------
D4940 – 10
NOTE 1—A typical value of conductivity for a high level of contamination is 500 µmho/cm. A typical value for a low level of contamination is 50
µmho/cm.
5. Apparatus
5.1 Conductivity Bridge and Cell—Any commercial conduct
...