ASTM D7232-06(2016)

Standard Test Method for Rapid Determination of the Nonvolatile Content of Coatings by Loss in Weight

SIGNIFICANCE AND USE
5.1 This test method is intended for use as a rapid quality control, acceptance, and assessment test. Results are obtained in five to fifteen minutes on most materials. Since the instrument parameters are adjusted to produce the same results as Test Method D2369, which takes over one hour to run, the time and effort expended on determining the optimal conditions for testing a coating with this instrumental method is valuable when numerous measurements are going to be made on different lots or batches of the same material. Also, the automation of the measurement and the calculations should lead to fewer mistakes being made by less-trained operators.
SCOPE
1.1 This test method is used to obtain rapid determination of the weight percent nonvolatile (solids) content via instrumental loss in weight technology. It is not meant as a replacement for Test Method D2369.  
1.2 This test method is principally intended for quality control labs and manufacturing environments where previously characterized materials will be tested repeatedly for different batches or lots.  
1.3 This test method can be used for waterborne and solventborne resins, intermediates and finished paint products. This test method may not be applicable to all types of coatings.  
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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 to determine the applicability of regulatory limitations prior to use.
Note 1: There is no similar or equivalent ISO standard.

General Information

• Status: Historical
• Publication Date: 30-Nov-2016
• ICS: 87.040 - Paints and varnishes
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.21 - Chemical Analysis of Paints and Paint Materials

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7232 − 06 (Reapproved 2016)
Standard Test Method for
Rapid Determination of the Nonvolatile Content of Coatings
1
by Loss in Weight
This standard is issued under the fixed designation D7232; 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.
3
1. Scope cialty Chemicals (Withdrawn 2009)
1.1 Thistestmethodisusedtoobtainrapiddeterminationof
3. Terminology
theweightpercentnonvolatile(solids)contentviainstrumental
3.1 Definitions:
loss in weight technology. It is not meant as a replacement for
3.1.1 The definitions used in this test method are in accor-
Test Method D2369.
dance with Terminology D16.
1.2 This test method is principally intended for quality
3.1.2 nonvolatile content, n—the coating material that re-
controllabsandmanufacturingenvironmentswherepreviously
mains in the pan at the conclusion of the test.
characterized materials will be tested repeatedly for different
3.2 Definitions of Terms Specific to This Standard:
batches or lots.
3.2.1 flip and squish, n—a testing technique that may be
1.3 This test method can be used for waterborne and
used when the expected nonvolatile content is greater than
solventborne resins, intermediates and finished paint products.
40%, or when the sample is highly viscous and does not
Thistestmethodmaynotbeapplicabletoalltypesofcoatings.
absorb well into the filter paper.
3.2.1.1 Discussion—The specimen is applied to the filter
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information paper on the sample pan, the filter paper is “flipped” over and
the specimen is then “squished” between the filter paper and
only.
the sample pan in order to more uniformly distribute the
1.5 This standard does not purport to address all of the
specimen. In addition, use of this technique forces the glass
safety concerns, if any, associated with its use. It is the
fibers of the filter paper into the specimen, helping to create
responsibility of the user of this standard to establish appro-
pathways for volatiles release from the specimen and avoiding
priate safety and health practices and to determine the
incomplete volatiles removal due to “skinning over” of the
applicability of regulatory limitations prior to use.
sample material.
NOTE 1—There is no similar or equivalent ISO standard.
3.2.2 lift, n—theresultofconvectioncurrentscreatedduring
theheatingofthespecimenthatraisesthesamplepanoffofits
2. Referenced Documents
support and falsely indicates a weight loss.
2
2.1 ASTM Standards:
3.2.2.1 Discussion—This effect is compensated for by the
D16TerminologyforPaint,RelatedCoatings,Materials,and
use of an algorithm that is applied to the digital data.
Applications
3.2.3 syringe tare, n—a testing technique that may be used
D2369Test Method for Volatile Content of Coatings
when the expected nonvolatile content is less than 40%, or
E180Practice for Determining the Precision of ASTM
when the sample is highly volatile and tends to evaporate
Methods for Analysis and Testing of Industrial and Spe-
rapidly.
3.2.3.1 Discussion—The specimen weight is determined
usinganexternalbalancebycalculatingthedifferencebetween
the syringe weight before (initial weight) and after (final
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint weight) the specimen is applied to the pan. This difference
and Related Coatings, Materials, andApplications and is the direct responsibility of
between initial and final weight is the actual weight of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
specimen(see10.2),andisusedtominimizeerrorduetorapid
Current edition approved Dec. 1, 2016. Published December 2016. Originally
change of the specimen weight after addition to a heated
approved in 2006. Last previous edition approved in 2012 as D7232 – 06 (2012).
DOI: 10.1520/D7232-06R16.
sample pan.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7232 − 06 (2016)
4. Summary of Test Method 8. Calibration and Standardization
4.1 The specimen is spread onto a sample pan that is 8.1 To maintain the integrity of the test results, the balance
supported on a balance in a heatin
...

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.
Designation: D7232 − 06 (Reapproved 2012) D7232 − 06 (Reapproved 2016)
Standard Test Method for
Rapid Determination of the Nonvolatile Content of Coatings
1
by Loss in Weight
This standard is issued under the fixed designation D7232; 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 is used to obtain rapid determination of the weight percent nonvolatile (solids) content via instrumental
loss in weight technology. It is not meant as a replacement for Test Method D2369.
1.2 This test method is principally intended for quality control labs and manufacturing environments where previously
characterized materials will be tested repeatedly for different batches or lots.
1.3 This test method can be used for waterborne and solventborne resins, intermediates and finished paint products. This test
method may not be applicable to all types of coatings.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 to determine the applicability of regulatory
limitations prior to use.
NOTE 1—There is no similar or equivalent ISO standard.
2. Referenced Documents
2
2.1 ASTM Standards:
D16 Terminology for Paint, Related Coatings, Materials, and Applications
D2369 Test Method for Volatile Content of Coatings
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
3
(Withdrawn 2009)
3. Terminology
3.1 Definitions:
3.1.1 The definitions used in this test method are in accordance with Terminology D16.
3.1.2 nonvolatile content, n—the coating material that remains in the pan at the conclusion of the test.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 flip and squish, n—a testing technique that may be used when the expected nonvolatile content is greater than 40 %, or
when the sample is highly viscous and does not absorb well into the filter paper.
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 D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved June 1, 2012Dec. 1, 2016. Published July 2012December 2016. Originally approved in 2006. Last previous edition approved in 20062012 as
D7232 – 06. 06 (2012). DOI: 10.1520/D7232-06R12.10.1520/D7232-06R16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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
The last approved version of this historical standard is referenced on www.astm.org.
3.2.1.1 Discussion—
The specimen is applied to the filter paper on the sample pan, the filter paper is “flipped” over and the specimen is then “squished”
between the filter paper and the sample pan in order to more uniformly distribute the specimen. In addition, use of this technique
forces the glass fibers of the filter paper into the specimen, helping to create pathways for volatiles release from the specimen and
avoiding incomplete volatiles removal due to “skinning over” of the sample material.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7232 − 06 (2016)
3.2.2 lift, n—the result of convection currents created during the heating of the specimen that raises the sample pan off of its
support and falsely indicates a weight loss.
3.2.2.1 Discussion—
This effect is compensated for by the use of an algorithm that is applied to the digital data.
3.2.3 syringe tare, n—a testing technique that may be used when the expected nonvolatile content is less than 40 %, or when
the sample is highly volatile and tends to evaporate rapidly.
3.2.3.1 Discussion—
The specimen weight is determined using an external balance by calculating the difference between the syringe weight before
(initial weight) and after (final weight) the specimen is
...