ASTM D280-01(2012)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D280 − 01 (Reapproved 2012)
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 Department of Defense.
1. Scope used in the test. Remove the stopper (or cover) and place it and
the bottle (or dish) containing the specimen in an oven that has
1.1 These test methods cover procedures for determining
been previously heated to 110 6 2°C, heat for2hata
hygroscopic moisture (and other matter volatile under the test
temperature of 105 to 110°C. Replace the stopper (or cover),
conditions) in pigments.
cool in a desiccator, and weigh. Calculate the total loss in
1.2 The values stated in SI units are to be regarded as
weight as percent of moisture and other volatile matter.
standard. No other units of measurement are included in this
standard. METHOD B—FOR PIGMENTS THAT DECOMPOSE
AT 110°C
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Apparatus
responsibility of the user of this standard to establish appro-
4.1 Weighing Bottle, glass, as described in 2.1.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4.2 Open-Tube Manometer made of glass tubing 6 mm in
diameter, filled with mercury to approximately 860 mm, fitted
METHOD A—FOR PIGMENTS THAT DO NOT
with rubber pressure tubing attached to a T-joint leading to the
DECOMPOSE AT 110°C
desiccator and the pump.Asuitable low-pressure gage may be
used in place of the manometer.
2. Apparatus
NOTE 1—The difference in levels of the mercury in the manometer
2.1 Weighing Bottle, wide-mouth, cylindrical, glass (flat
when the system is in operation, subtracted from the barometer reading
form, about 30 mm in height and about 70 mm in diameter),
taken at the same time, gives the pressure of the system in millimetres of
provided with a ground-in glass stopper. Or, an aluminum
mercury.
moisture dish (about 90 mm in diameter and about 50 mm in
4.3 Desiccator, glass, having a hole at the side or in the
depth) with a tightly fitting cover.
cover, constructed with heavy walls to withstand a vacuum of
2.2 Oven in which a temperature of from 110 6 2°C is
one atmosphere. The hole at the side shall be closed with a
maintained.
one-hole rubber stopper carrying a glass tube with a rubber
tube connection and a pinchcock or with a glass stopcock
2.3 Analytical Balance.
ground to fit the tubulature.
3. Procedure
4.4 Oil Vacuum Pump, able to achieve and hold a vacuum
of 3 mm.
3.1 Weigh accurately the glass weighing bottle and stopper
or the aluminum moisture dish with cover. Place a specimen of
4.5 Analytical Balance.
from 3 to5gofthe pigment in the clean, dry weighing bottle
5. Procedure
or in the clean, dry aluminum moisture dish. Insert the stopper
(or cover) and weigh to 0.1 mg. Subtract the weight of the
5.1 Weigh accurately the glass weighing bottle and stopper.
vessel from the total weight to obtain the weight of sample
Place a specimen of from 1 to3gofthe pigment in the clean,
dry weighing bottle, insert the stopper and weigh to 0.1 mg.
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 of supply of the “
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