ASTM D1644-01

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D1644–01
Standard Test Methods for
Nonvolatile Content of Varnishes
This standard is issued under the fixed designation D 1644; 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 dish (Note 1), 80 to 100 mm in diameter and 5 to 10 mm in
depth, such as friction-top can covers, ointment boxes, or petri
1.1 These test methods determine the fraction of a varnish
dishes.
that is nonvolatile at the temperature of the test while volatile
solvents are driven off. It is sometimes an approximate
NOTE 1—The term “tared, flat-bottomed dish” implies that the empty
measure of the film-forming matter in a varnish. dish has no measurable weight change when subjected to the same heat
schedule as prescribed for the dish containing the specimen. If this is
1.2 This standard does not purport to address all of the
found to be not so, then more suitable vessels must be found, or
safety concerns, if any, associated with its use. It is the
corrections applied.
responsibility of the user of this standard to establish appro-
4.2 Bygentletilting,spreadthespecimenoverthebottomof
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For a specific the dish and heat for3hina ventilated oven maintained at 105
62°C.Ifnecessary,apieceofstoutwirecanbeincludedinthe
statement, see Section 3.
tare of the dish and used at intervals to break up skins by
2. Significance and Use
stirring during the heating period. Cool in a desiccator and
2.1 These test methods are applicable to varnish and are weigh the dish.
useful to producers and users in determining nonvolatile
5. Calculation
content and are sometimes an appropriate measure of the
film-forming matter in varnish. 5.1 Calculate the percent of nonvolatile matter NV as
follows (Note 2):
3. Hazards
NV 5 @~C 2 A!/S# 3 100 (1)
3.1 Since the flash points of some of the solvents used in
coatings and related products are below the temperature of the
where:
test, care should be exercised that the lower explosive limits of
A = weight of dish, g,
the solvents are not exceeded. The amount of solvent in the
S = weight of specimen used, g, and
oven atmosphere at any one time will depend on the number of
C = weight of dish and contents after heating, g.
tests (pans) in the oven, the percent nonvolatile of the samples,
the size of the oven, the type of oven (mechanical or gravity
NOTE 2—Determinations of nonvolatile matter by this test method may
convection) and the air changes per hour. give high results due either to incomplete elimination of volatile matter or
to absorption of oxygen by oxidizing-type varnishes.
TEST METHOD A—3 h AT 105°C
6. Report
4. Procedure
6.1 Report the nonvolatile matter of the sample to the
4.1 Place a portion of the thoroughly mixed sample in a
nearest 0.1 %.
stoppered bottle, or alternatively, in a weighing pipet or a
TEST METHOD B—10 min at 150
...