ASTM D4752-10
(Test Method)Standard Practice for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub
Standard Practice 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. 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 practice is used.
SCOPE
1.1 This practice 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 D5402 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.
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Designation: D4752 − 10
StandardPractice for
Measuring MEK Resistance of Ethyl Silicate (Inorganic)
1
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.
1. Scope* D7091 Practice for Nondestructive Measurement of Dry
Film Thickness of Nonmagnetic Coatings Applied to
1.1 This practice describes a solvent rub technique for
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
assessing the MEK resistance of ethyl silicate (inorganic)
ings Applied to Non-Ferrous Metals
zinc-rich primers. The MEK resistance of some two-
component ethyl silicate zinc-rich primers has been shown to
3. Terminology
correlate well with the cure of the primer as determined by
2
3.1 Definitions of Terms Specific to This Standard:
diffuse reflectance infrared spectroscopy. The technique can
be used in the laboratory, field, or in the fabricating shop. 3.1.1 double rub, n—the act of rubbing a solvent saturated
cloth in one complete forward and backward motion over a
Practice D5402 is the preferred method for organic coatings.
coated surface.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Significance and Use
only.
4.1 Ethyl silicate zinc-rich primers cure by the reaction of
1.3 This standard does not purport to address all of the
the vehicle with moisture, thereby providing a binder. As
safety concerns, if any, associated with its use. It is the
relative humidity and temperature vary during the day, so does
responsibility of the user of this standard to establish appro-
the rate of cure.Acertain minimum degree of cure is necessary
priate safety and health practices and determine the applica-
prior to topcoating. It has been shown that the degree of cure
bility of regulatory limitations prior to use. Specific hazard
of ethyl silicate zinc-rich primers can be measured by the
statements are given in Section 6. Consult supplier’s Material
chemical changes occurring using diffuse reflectance infrared
Safety Data Sheet(s) for specific hazard information relating to
2
spectroscopy. This solvent rub test has been shown to corre-
the solvent used.
late well with the infrared spectroscopic results of some
two-component ethyl silicate inorganic zinc systems.
2. Referenced Documents
3
4.2 The cure rating required for the application of specific
2.1 ASTM Standards:
topcoats must be agreed upon before the practice is used.
D740 Specification for Methyl Ethyl Ketone
D4138 Practices for Measurement of Dry Film Thickness of
5. Reagents and Materials
Protective Coating Systems by Destructive, Cross-
Sectioning Means
5.1 Methyl Ethyl Ketone (MEK), in accordance with Speci-
D5402 Practice for Assessing the Solvent Resistance of
fication D740.
Organic Coatings Using Solvent Rubs
5.2 100 % Cotton, Shop Cloth, approximately 300 by 300
mm (12 by 12 in.) contrasting in color to the coating to be
1 evaluated.
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
5.3 Squeeze Bottle.
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved Feb. 1, 2010. Published April 2010. Originally
5.4 Proper Safety Equipment, as determined from the sol-
approved in 1987. Last previous edition approved in 2003 as D4752 – 03. DOI:
vent MSDS, for example, solvent resistant gloves, respirator.
10.1520/D4752-10.
2
Starr, T. L., Henton, L. E., Lewis, W. S., and Rideout, F. A., “Improved Field
6. Procedure
Reliability of High Performance Coating Systems: Phase II—Develop Procedures
and Criteria in Critical Performance Areas,” available from SSPC: The Society for
6.1 Selectareasontheprimersurfaceatleast150mm(6in.)
Protective Coatings, 40 24th St., Sixth Floor, Pittsburgh, PA 15213, www.sspc.org.
3
long on which to run the tests. Clean the surface with tap water
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
or dry cloth to remove loose material.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. NOTE 1—Tap water may influence the cure of the zinc-rich primer.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D4752 − 10
TABLE 1 Scale for Resistance Rating
6.2 Measure the
...
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:D4752–03
Standard Test Method for Designation:D4752–10
Standard Practice for
Measuring MEK Resistance of Ethyl Silicate (Inorganic)
1
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.
1. Scope*
1.1 This test methodpractice 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
2
withthecureoftheprimerasdeterminedbydiffusereflectanceinfraredspectroscopy. Thetechniquecanbeusedinthelaboratory,
field, or in the fabricating shop. Practice D5402 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.
2. Referenced Documents
3
2.1 ASTM Standards:
D740 Specification for Methyl Ethyl Ketone D1186Test Methods for Nondestructive Measurement of Dry Film Thickness of
Nonmagnetic Coatings Applied to a Ferrous Base
D1400Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a
Nonferrous Metal Base
D4138 Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning
Means
D5402 Practice for Assessing the Solvent Resistance of Organic Coatings Using Solvent Rubs Practice for Assessing the
Solvent Resistance of Organic Coatings Using Solvent Rubs
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals
and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 double rubdouble rub, n—the act of rubbing a solvent saturated cloth in one complete forward and backward motion over
a coated surface.
4. Significance and Use
4.1 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
1
This test method practice is under the jurisdiction ofASTM Committee D01 on Paint and Related Coatings, Materials, andApplications 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 1987. Last previous edition approved in 1998 as D4752–98. DOI:
10.1520/D4752-03.
Current edition approved Feb. 1, 2010. Published April 2010. Originally approved in 1987. Last previous edition approved in 2003 as D4752 – 03. DOI:
10.1520/D4752-10.
2
Starr, T. L., Henton, L. E., Lewis, W. S., and Rideout, F. A., “ Improved Field Reliability of High Performance Coating Systems: Phase II—Develop Procedures and
Criteria in Critical Performance Areas,” available from SSPC: The Society for Protective Coatings, 40 24th St., Sixth Floor, Pittsburgh, PA 15213, www.sspc.org.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D4752–10
topcoating. It has been shown that the degree of cure of ethyl silicate zinc-rich primers can be measured by the chemical changes
2
occurring using diffuse reflectance infrared spectroscopy. This solvent rub test has been shown to correlate well with the infrared
spectroscopic results
...
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