ASTM D4752-03
(Test Method)Standard Test Method for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub
Standard Test Method for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub
SIGNIFICANCE AND USE
Ethyl silicate zinc-rich primers cure by the reaction of the vehicle with moisture, thereby providing a binder. As relative humidity and temperature vary during the day, so does the rate of cure. A certain minimum degree of cure is necessary prior to topcoating. It has been shown that the degree of cure of ethyl silicate zinc-rich primers can be measured by the chemical changes occurring using diffuse reflectance infrared spectroscopy.2 This solvent rub test has been shown to correlate well with the infrared spectroscopic results of some two-component ethyl silicate inorganic zinc systems.
The cure rating required for the application of specific topcoats must be agreed upon before the test method is used.
SCOPE
1.1 This test method describes a solvent rub technique for assessing the MEK resistance of ethyl silicate (inorganic) zinc-rich primers. The MEK resistance of some two-component ethyl silicate zinc-rich primers has been shown to correlate well with the cure of the primer as determined by diffuse reflectance infrared spectroscopy. The technique can be used in the laboratory, field, or in the fabricating shop. Practice D 5402 is the preferred method for organic coatings.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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. Specific hazard statements are given in Section 6. Consult supplier's Material Safety Data Sheet(s) for specific hazard information relating to the solvent used.
General Information
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4752–03
Standard Test Method for
Measuring MEK Resistance of Ethyl Silicate (Inorganic)
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Zinc-Rich Primers by Solvent Rub
This standard is issued under the fixed designation D4752; 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.
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1. Scope a Nonferrous Metal Base
D4138 PracticesforMeasurementofDryFilmThicknessof
1.1 This test method describes a solvent rub technique for
Protective Coating Systems by Destructive, Cross-
assessing the MEK resistance of ethyl silicate (inorganic)
Sectioning Means
zinc-rich primers. The MEK resistance of some two-
D5402 Practice for Assessing the Solvent Resistance of
component ethyl silicate zinc-rich primers has been shown to
Organic Coatings Using Solvent Rubs
correlate well with the cure of the primer as determined by
2
diffuse reflectance infrared spectroscopy. The technique can
3. Terminology
be used in the laboratory, field, or in the fabricating shop.
3.1 Definitions of Terms Specific to This Standard:
Practice D5402 is the preferred method for organic coatings.
3.1.1 double rub—the act of rubbing a solvent saturated
1.2 The values stated in SI units are to be regarded as the
cloth in one complete forward and backward motion over a
standard. The values given in parentheses are for information
coated surface.
only.
1.3 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 Ethyl silicate zinc-rich primers cure by the reaction of
responsibility of the user of this standard to establish appro-
the vehicle with moisture, thereby providing a binder. As
priate safety and health practices and determine the applica-
relative humidity and temperature vary during the day, so does
bility of regulatory limitations prior to use. Specific hazard
the rate of cure.Acertain minimum degree of cure is necessary
statements are given in Section 6. Consult supplier’s Material
prior to topcoating. It has been shown that the degree of cure
Safety Data Sheet(s) for specific hazard information relating to
of ethyl silicate zinc-rich primers can be measured by the
the solvent used.
chemical changes occurring using diffuse reflectance infrared
2
2. Referenced Documents spectroscopy. This solvent rub test has been shown to corre-
3 late well with the infrared spectroscopic results of some
2.1 ASTM Standards:
two-component ethyl silicate inorganic zinc systems.
D740 Specification for Methyl Ethyl Ketone
4.2 The cure rating required for the application of specific
D1186 Test Methods for Nondestructive Measurement of
topcoats must be agreed upon before the test method is used.
Dry Film Thickness of Nonmagnetic Coatings Applied to
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a Ferrous Base
5. Reagents and Materials
D1400 Test Method for Nondestructive Measurement of
5.1 Methyl Ethyl Ketone (MEK), in accordance with Speci-
DryFilmThicknessofNonconductiveCoatingsAppliedto
fication D740.
5.2 Cheesecloth, 100 % cotton mesh size grade 28 by 24
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
approximately 300- by 300-mm (12- by 12-in.) and contrasting
and Related Coatings, Materials, andApplications and is the direct responsibility of
in color to the coating being evaluated, or other mutually
Subcommittee D01.46 on Industrial Protective Coatings.
agreed upon cloth.
Current edition approved Jan. 10, 2003. Published March 2003. Originally
approved in 1987. Last previous edition approved in 1998 as D4752 – 98. DOI: 5.3 Squeeze Bottle.
10.1520/D4752-03.
5.4 Proper Safety Equipment, as determined from the sol-
2
Starr, T. L., Henton, L. E., Lewis, W. S., and Rideout, F. A., “Improved Field
vent MSDS, for example, solvent resistant gloves, respirator.
Reliability of High Performance Coating Systems: Phase II—Develop Procedures
and Criteria in Critical Performance Areas,” available from SSPC: The Society for
6. Procedure
Protective Coatings, 40 24th St., Sixth Floor, Pittsburgh, PA 15213, www.sspc.org.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Selectareasontheprimersurfaceatleast150mm(6in.)
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
long on which to run the tests. Clean the surface with tap water
Standards volume information, refer to the standard’s Document Summary page on
or dry cloth to remove loose material.
the ASTM website.
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Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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