ASTM D280-81(1995)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: D 280 – 81 (Reapproved 1995)
Standard Test Methods for
Hygroscopic Moisture (and Other Matter Volatile Under the
Test Conditions) in Pigments
This standard is issued under the fixed designation D 280; 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 METHOD B—FOR PIGMENTS THAT DECOMPOSE
AT 110°C
1.1 These test methods cover procedures for determining
hygroscopic moisture (and other matter volatile under the test
4. Apparatus
conditions) in pigments.
4.1 Weighing Bottle, glass, as described in 2.1.
1.2 This standard does not purport to address all of the
4.2 Open-Tube Manometer made of glass tubing 6 mm in
safety concerns, if any, associated with its use. It is the
diameter, filled with mercury to approximately 860 mm, fitted
responsibility of the user of this standard to establish appro-
with rubber pressure tubing attached to a T-joint leading to the
priate safety and health practices and determine the applica-
desiccator and the pump. A suitable low-pressure gage may be
bility of regulatory limitations prior to use.
used in place of the manometer.
METHOD A—FOR PIGMENTS THAT DO NOT
NOTE 1—The difference in levels of the mercury in the manometer
DECOMPOSE AT 110°C
when the system is in operation, subtracted from the barometer reading
taken at the same time, gives the pressure of the system in millimetres of
2. Apparatus
mercury.
2.1 Weighing Bottle, wide-mouth, cylindrical, glass (flat
4.3 Desiccator, glass, having a hole at the side or in the
form, about 30 mm in height and about 70 mm in diameter),
cover, constructed with heavy walls to withstand a vacuum of
provided with a ground-in glass stopper. Or, an aluminum
one atmosphere. The hole at the side shall be closed with a
moisture dish (about 90 mm in diameter and about 50 mm in
one-hole rubber stopper carrying a glass tube with a rubber
depth) with a tightly fitting cover.
tube connection and a pinchcock or with a glass stopcock
2.2 Oven in which a temperature of from 110 6 2°C is
ground to fit the tubulature.
maintained. 2
4.4 Oil Vacuum Pump, able to achieve and hold a vacuum
2.3 Analytical Balance.
of 3 mm.
4.5 Analytical Balance.
3. Procedure
3.1 Weigh accurately the glass weighing bottle and stopper
5. Procedure
or the aluminum moisture dish with cover. Place a specimen of
5.1 Weigh accurately the glass weighing bottle and stopper.
from3to5gofthe pigment in the clean, dry weighing bottle
Place a specimen of from 1 to3gofthe pigment in the clean,
or in the clean, dry aluminum moisture dish. Insert the stopper
dry weighing bottle, insert the stopper and weigh to 0.1 mg.
(or cover) and weigh to 0.1 mg. Subtract the weight of the
Subtract the weight of the vessel from the total weight to obtain
vessel from the total weight to obtain the weight of sample
the weight of sample used in the test.
used in the test. Remove the stopper (or cover) and place it and
5.2 Remove the stopper and place it and the bottle contain-
the bottle (or dish) containing the specimen in an oven that has
ing the specimen in the desiccator con
...