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ASTM D4940-98

(Test Method)

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

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

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 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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
09-May-1998
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.46 - Industrial Protective Coatings
Current Stage
Ref Project

Relations

Replaced By
ASTM D4940-98(2003) - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blasting Abrasives
Effective Date
10-Jan-2003

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ASTM D4940-98 - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blasting AbrasivesASTM D4940-98 - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blasting Abrasives
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ASTM D4940-98 - Standard Test Method for Conductimetric Analysis of Water Soluble Ionic Contamination of Blasting Abrasives
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 4940 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Conductimetric Analysis of Water Soluble Ionic
1
Contamination of Blasting Abrasives
This standard is issued under the fixed designation D 4940; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope The conductivity, which is related to the concentration of
soluble ionic materials contaminating the abrasive surface, is
1.1 This test method describes a procedure for rapid evalu-
calculated from the conductance and the cell constant.
ation of abrasives for the presence of ionic contamination by
determining the total concentration of water soluble ionic
4. Significance and Use
contaminants by means of a conductivity test.
4.1 By-product abrasives manufactured from slags that are
1.2 This test method does not identify the ionic species
air cooled or quenched with pure water, normally contain low
present nor provide quantitative results on each species.
concentrations of ionic materials as do mined mineral abra-
1.3 This test method is based on a volume comparison
sives. However, slags quenched with seawater or other con-
among abrasives of similar sizes. A volume comparison is
taminated water, contain high amounts of ionic material as
more closely related to surface area of the abrasives than is a
does seashore sand. This contamination of the abrasive can
weight comparison.
transfer to the steel surfaces being blasted, where it may
1.4 This standard does not purport to address all of the
accelerate corrosion. This test is useful in establishing the
safety concerns, if any, associated with its use. It is the
cleanliness of the abrasive at the jobsite.
responsibility of the user of this standard to establish appro-
4.2 This test method provides a value that indicates the
priate safety and health practices and determine the applica-
concentration of total water soluble ions in accordance with
bility of regulatory limitations prior to use.
their electrolytic mobility. Thus, it provides an indication of
2. Referenced Documents ionic corrosion potential.
2.1 ASTM Standards:
NOTE 1—A typical value of conductivity for a high level of contami-
2
D 1193 Specification for Reagent Water nation is 500 μmho/cm. A typical value for a low level of contamination
3
is 50μ mho/cm.
E 832 Specification for Laboratory Filter Papers
2.2 Other Standard:
5. Apparatus
ISO 11127-6 Preparation of Steel Substrates before Appli-
5.1 Conductivity Bridge and Cell—Any commercial con-
cation of Paints and Related Products - Test Methods for
ductivity bridge and conductivity cell having a range of at least
Non-Metalic Blast Cleaning Abrasives - Part 6: Determi-
5μ mho/cm to 1 000 000 μmho/cm and temperature compen-
nation of Water-Soluble Contaminants by Conductivity
4
sation capability is satisfactory. Either a dip-type, pipet-type, or
Measurement
cup-type cell may be used. A means of adjusting for tempera-
2.3 Steel Structures Painting Council Standard:
5
ture or controlling the temperature is essential. While some
SSPC-AB 1 “Specification for Mineral and Slag Abrasives
instruments have an adjustment to compensate for temperature,
3. Summary of Test Method
one means is to use a 25°C constant temperature bath. Another
method is to stir the solution with a clean thermometer while
3.1 Abrasive and pure water are combined into a slurry that
the vessel is warmed or cooled by an external source.
is stirred to leach the soluble salts from the abrasive. This
slurry is filtered and conductance of the filtrate is measured.
NOTE 2—ISO 11127-6 is another method for assessing the level of
soluble salt contamination present in an abrasive. It differs from this test
method in two major areas:
1
This specification is under the jurisdiction of ASTM Committee D-1 on Paint
(1) The ISO method uses a weight to volume ratio between the abrasive
and Related Coatings, Materials, and Applications and is the direct responsibility of
and the fluid (deionized water) used to extract soluble salts from the
Subcommittee D01.46 on Industrial Protective Coatings.
abrasive. The ASTM method allows a user to measure a loose packed
Current edition approved May 10, 1998. Published September 1998. Originally
published as D 4940 – 89. Last previous edition D 4940 – 89 (1994). volume of abrasive and mix that abrasive with an equal volume of reagent
2
Annual Book of ASTM Standards, Vol 11.01.
water. The ISO method is well suited to use in a laboratory setting but is
3
Annual
...

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Note 1: Specific test methods are applicable only to certain types of joint fillers, as stated herein.  
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