Standard Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments

SCOPE
1.1 These methods cover procedures for determining hygroscopic moisture (and other matter volatile under the test conditions) in pigments.  
1.2  This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Publication Date
09-May-2001
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ASTM D280-01 - Standard Test Methods for Hygroscopic Moisture (and Other Matter Volatile Under the Test Conditions) in Pigments
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D280–01
Standard Test Methods for
Hygroscopic Moisture (and Other Matter Volatile Under the
1
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 cool in a desiccator, and weigh. Calculate the total loss in
weight as percent of moisture and other volatile matter.
1.1 These test methods cover procedures for determining
hygroscopic moisture (and other matter volatile under the test
METHOD B—FOR PIGMENTS THAT DECOMPOSE
conditions) in pigments.
AT 110°C
1.2 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-
4.2 Open-Tube Manometer made of glass tubing 6 mm in
bility of regulatory limitations prior to use.
diameter, filled with mercury to approximately 860 mm, fitted
with rubber pressure tubing attached to a T-joint leading to the
METHODA—FOR PIGMENTS THAT DO NOT
desiccator and the pump.Asuitable low-pressure gage may be
DECOMPOSEAT 110°C
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
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
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
2.3 Analytical Balance.
tube connection and a pinchcock or with a glass stopcock
ground to fit the tubulature.
3. Procedure
2
4.4 Oil Vacuum Pump, able to achieve and hold a vacuum
3.1 Weigh accurately the glass weighing bottle and stopper
of 3 mm.
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,
used in the test. Remove the stopper (or cover) and place it and
dry weighing bottle, insert the stopper and weigh to 0.1 mg.
the bottle (or dish) containing the specimen in an oven that has
Subtracttheweightofthevesselfromthetotalweighttoobtain
been previously heated to 110 6 2°C, heat for2hata
the weight of sample used in the test.
temperature of 105 to 110°C. Replace the stopper (or cover),
5.2 Remove the stopper and place it and the bottle conta
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