ASTM D4940-15e1
(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 and health practices and determine the applicability of regulatory limitations prior to use.
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´1
Designation:D4940 −15
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
ε NOTE—Conversion factor in Note 1 was editorially corrected in July 2016.
1. Scope nation of Water-Soluble Contaminants by Conductivity
3
Measurement
1.1 This test method describes a procedure for assessing
4
2.3 SSPC: The Society for Protective Coatings:
blast cleaning abrasives for the presence of conductive-
SSPC-AB 1Mineral and Slag Abrasives
potential, ionic contaminants by determining the total concen-
SSPC-AB 2Cleanliness of Recycled Ferrous MetallicAbra-
trationofwatersolubleconductivespeciesusingaconductivity
sive
test.
SSPC-AB 3Ferrous Metallic Abrasive
1.2 This test method does not identify the ionic species
SSPC-AB 4Recyclable Encapsulated Abrasive Media
present nor provide quantitative results on each species.
3. Summary of Test Method
1.3 This test method is based on a volume comparison
among abrasives of similar sizes. A volume comparison is
3.1 Abrasive and pure water are combined into a slurry that
more closely related to surface area of the abrasives than is a
is stirred to leach the soluble salts from the abrasive. This
weight comparison.
slurry is filtered and conductance of the filtrate is measured.
The conductivity, which is related to the concentration of
1.4 The values stated in SI units are to be regarded as
soluble ionic materials contaminating the abrasive, is calcu-
standard. No other units of measurement are included in this
lated from the conductance and the cell constant.
standard.
1.5 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 Abrasive media may contain ionic contamination natu-
responsibility of the user of this standard to establish appro-
rally (for example, beach sand), from manufacturing (quench-
priate safety and health practices and determine the applica-
ingwithcontaminatedwater),transportation,storageoruse(in
bility of regulatory limitations prior to use.
the case of abrasive that is reused). Ionic contamination on the
abrasive may transfer to the surface during abrasive blast
2. Referenced Documents
cleaning, resulting in potential osmotic blistering, accelerated
2
2.1 ASTM Standards:
underfilm corrosion and premature coating failure.
D1193Specification for Reagent Water
4.2 This test method describes a shop/field procedure for
E832Specification for Laboratory Filter Papers
assessing the level of conductive species on an abrasive.
2.2 Other Standard:
4.3 Abrasive standards published by SSPC (AB) and ISO
ISO 11127-6Preparation of Steel Substrates beforeApplica-
tion of Paints and Related Products - Test Methods for 11126 provide tolerance levels for water soluble contaminants
of the abrasive.
Non-Metallic Blast CleaningAbrasives - Part 6: Determi-
5. Apparatus
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
5.1 Conductivity Bridge and Cell—Any commercial con-
and Related Coatings, Materials, andApplications and is the direct responsibility of
ductivity bridge and conductivity cell typically having a range
Subcommittee D01.46 on Industrial Protective Coatings.
of at least 5 µmho/cm to 10,000 µmho/cm with built-in
Current edition approved Dec. 1, 2015. Published December 2015. Originally
approved in 1989. Last previous edition approved in 2010 as D4940– 10. DOI:
10.1520/D4940-15E01.
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
---------------------- Page: 1 ----------------------
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D4940−15
temperature compensation is satisfactory. A dip-type, pipet- 7. Sampling
type, or cup-type cell may be used.
7.1 Sampling shall be as follows unless otherwise agreed
5.2 Filter Paper, conforming to Specification E832,Type 1, upon between the purchaser and the seller. Take two 1-L
Class C, to keep silt from fouling the surfaces of the conduc- s
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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.
´1
Designation: D4940 − 15 D4940 − 15
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Conversion factor in Note 1 was editorially corrected in July 2016.
1. 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 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:
ISO 11127-6 Preparation of Steel Substrates before Application of Paints and Related Products - Test Methods for Non-Metallic
3
Blast Cleaning Abrasives - Part 6: Determination of Water-Soluble Contaminants by Conductivity Measurement
4
2.3 SSPC: The Society for Protective Coatings:
SSPC-AB 1 Mineral and Slag Abrasives
SSPC-AB 2 Cleanliness of Recycled Ferrous Metallic Abrasive
SSPC-AB 3 Ferrous Metallic Abrasive
SSPC-AB 4 Recyclable Encapsulated Abrasive Media
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, is calculated from the conductance and the cell constant.
4. 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.
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 Dec. 1, 2015. Published December 2015. Originally approved in 1989. Last previous edition approved in 2010 as D4940 – 10. DOI:
10.1520/D4940-15.10.1520/D4940-15E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’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 ----------------------
´1
D4940 − 15
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.
5. Apparatus
5.1 Conductivity Bridge and Cell—Any commercial conductivity bridge and conductivity cell typically having a range of at
least 5 μmho/cm to 10,000 μmho/cm with built-in temperature
...
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