ASTM D280-01(2023)
(Test Method)Standard Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments
Standard Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments
ABSTRACT
These test methods establish the standard procedures for determining the hygroscopic moisture (and other matter volatile under the test conditions) in pigments. Method A shall be performed on pigments that do not decompose at a specified temperature. This method shall require the use of a wide-mouth cylindrical glass weighing bottle, an oven, and an analytical balance. Method B, on the other hand, shall be used for pigments that decompose at the same specified temperature. This method shall also need a wide-mouth cylindrical glass weighing bottle, an open-tube manometer, a glass desiccator, an oil vacuum pump, and an analytical balance.
SCOPE
1.1 These test methods cover procedures for determining hygroscopic moisture (and other matter volatile under the test conditions) in pigments.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D280 − 01 (Reapproved 2023)
Standard Test Methods for
Hygroscopic Moisture (and Other Matter Volatile Under the
Test Conditions) in Pigments
This standard is issued under the fixed designation D280; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope from 3 g to 5 g of the pigment in the clean, dry weighing bottle
or in the clean, dry aluminum moisture dish. Insert the stopper
1.1 These test methods cover procedures for determining
(or cover) and weigh to 0.1 mg. Subtract the weight of the
hygroscopic moisture (and other matter volatile under the test
vessel from the total weight to obtain the weight of sample
conditions) in pigments.
used in the test. Remove the stopper (or cover) and place it and
1.2 The values stated in SI units are to be regarded as
the bottle (or dish) containing the specimen in an oven that has
standard. No other units of measurement are included in this
been previously heated to 110 °C 6 2 °C, heat for 2 h at a
standard.
temperature of 105 °C to 110 °C. Replace the stopper (or
1.3 This standard does not purport to address all of the
cover), cool in a desiccator, and weigh. Calculate the total loss
safety concerns, if any, associated with its use. It is the
in weight as percent of moisture and other volatile matter.
responsibility of the user of this standard to establish appro-
METHOD B—FOR PIGMENTS THAT DECOMPOSE
priate safety, health, and environmental practices and deter-
AT 110 °C
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
4. Apparatus
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.1 Weighing Bottle, glass, as described in 2.1.
Development of International Standards, Guides and Recom-
4.2 Open-Tube Manometer made of glass tubing 6 mm in
mendations issued by the World Trade Organization Technical
diameter, filled with mercury to approximately 860 mm, fitted
Barriers to Trade (TBT) Committee.
with rubber pressure tubing attached to a T-joint leading to the
desiccator and the pump. A suitable low-pressure gauge may be
METHOD A—FOR PIGMENTS THAT DO NOT
used in place of the manometer.
DECOMPOSE AT 110 °C
NOTE 1—The difference in levels of the mercury in the manometer
2. Apparatus
when the system is in operation, subtracted from the barometer reading
2.1 Weighing Bottle, wide-mouth, cylindrical, glass (flat
taken at the same time, gives the pressure of the system in millimetres of
form, about 30 mm in height and about 70 mm in diameter), mercury.
provided with a ground-in glass stopper. Or, an aluminum
4.3 Desiccator, glass, having a hole at the side or in the
moisture dish (about 90 mm in diameter and about 50 mm in
cover, constructed with heavy walls to withstand a vacuum of
depth) with a tightly fitting cover.
one atmosphere. The hole at the side shall be closed with a
2.2 Oven in which a temperature of from 110 °C 6 2 °C is one-hole rubber stopper carrying a glass tube with a rubber
tube connection and a pinchcock or with a glass stopcock
maintained.
ground to fit the tubulature.
2.3 Analytical Balance.
4.4 Oil Vacuum Pump, able to achieve and hold a vacuum
3. Procedure
of 3 mm.
3.1 Weigh accurately the glass weighing bottle and stopper
4.5 Analytical Balance.
or the aluminum moisture dish with cover. Place a specimen of
These test methods are under the jurisdiction of ASTM Committee D01 on
Paint and Related Coatings, Materials, and Applications and are the direct The sole source
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