ASTM D3792-05

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D3792–05
Standard Test Method for
Water Content of Coatings by Direct Injection Into a Gas
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Chromatograph
This standard is issued under the fixed designation D 3792; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope This gas chromatographic test method provides a relatively
simple and direct way to determine water content.
1.1 This test method is for the determination of the total
water content of waterborne paints. It has been evaluated for
5. Apparatus
latex systems (styrene-butadiene, poly(vinylacetate)-acrylic,
5.1 Gas Chromatography—Any gas-liquid chromato-
acrylic), epoxy acrylic resin systems and acrylic systems. The
graphic instrument equipped with a thermoconductivity detec-
established working range of this test method is from 15 to
tor may be used. Temperature programming capability is
90 %.Thereisnoreasontobelievethatitwillnotworkoutside
preferable, but isothermal operations may be adequate. See
of this range.
Table 1.
1.2 The values stated in SI units are to be regarded as the
5.2 Column—The column should be at least 1.22 m (4 ft) of
standard. The values given in parentheses are for information
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3.2-mm ( ⁄8-in.) outside diameter tubing of stainless steel, or
only.
other suitable material, lined with a TFE-fluorocarbon coating
1.3 This standard does not purport to address all of the
packed with 60/80 mesh (180 to 250 µm) porous polymer
safety concerns, if any, associated with its use. It is the
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packing material. A longer 1.83 m (6-ft) column can be used
responsibility of the user of this standard to establish appro-
to improve resolution.
priate safety and health practices and determine the applica-
5.3 Integrator—Any electronic integrator that can accu-
bility of regulatory limitations prior to use.
rately quantify a gas chromatographic peak is acceptable.
2. Referenced Documents Alternatively, a recording potentiometer with a full-scale
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deflectionof1-10mV,fullscaleresponsetimeof2sorlessand
2.1 ASTM Standards:
sufficient sensitivity and stability to meet the requirements of
D 1193 Specification for Reagent Water
5.1.
E 180 Practice for Determining Precision Data of ASTM
5.4 Liquid Charging Devices—Micro syringes of 5–10-µL
Methods for Analysis and Testing of Industrial Chemicals
capacity with a precision of 60.01 µL. Automatic injection of
3. Summary of Test Method samples improves the precision of this test method.
3.1 A suitable aliquot of whole paint is internally standard-
6. Column Conditioning
ized, diluted with dimethylformamide, and then injected into a
6.1 Procedure—Install the packed column in the gas chro-
gas chromatographic column containing a porous polymer
matographic unit leaving the exit end disconnected from the
packing that separates water from other volatile components.
detector. This will prevent any contamination of the detector
4. Significance and Use
with the column bleed.
6.1.1 Set the carrier gas flow rate at 20 to 30 mL/min if a
4.1 In order to calculate volatile organic content (VOC) in
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3.2-mm ( ⁄8-in.) outside diameter column is used. Purge the
waterborne paints, it is necessary to know the water content.
column 5 or 10 min before heating.
6.1.2 Heat the column from room temperature to 200°C at
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
5°C/min and hold this temperature for at least 12 h (overnight).
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. At the end of this time, heat the column at 5°C/min to 250°C
Current edition approved Jan. 1, 2005. Published February 2005. Originally
approved in 1979. Last previous edition approved in 1999 as D 3792 – 99.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or HayeSep R (silanized), was used in the round robin.Any other porous polymer
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM packing or other column giving equivalent or superior performance may be used.
Standards volume information, refer to the standard’s Document Summary page on These products are available from most gas chromatography suppliers and distribu-
the ASTM website. tors.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3792–05
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TABLE 1 Suggested Instrument Conditions
where such specifications are available. Other grades may be
...