ASTM D6658-01(2006)
(Test Method)Standard Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying
Standard Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying
SIGNIFICANCE AND USE
The result obtained by this test is normally considered to be the moisture content of the wet blue sample. This result is used to correct all other chemical tests to a moisture-free basis.
Materials that are volatile under these conditions, other than water, may be present in the wet blue, although their amount in any normal wet blue would be expected to be a very small percentage of the total volatile matter.
Under the conditions of this test, certain materials in wet blue, such as protein fiber and chromium tanning salts, may retain moisture. Other materials, such as natural animal fats, may be oxidized. Both of these effects produce negative errors in the moisture determination.
The amount of volatile matter (moisture) released by a given sample varies with (a) method and time of sample preparation, (b) weight of sample taken, (c) temperature and time of the oven drying, (d) type of oven (gravity versus mechanical convection) used.
Because of the above unknown errors, the result of this test is a purely arbitrary value for the moisture content of the sample. It is, therefore, essential that the method be followed exactly in order to obtain reproducible results among laboratories. This is particularly true if other chemical analytical tests being performed on the same sample are reported on the moisture-free basis.
SCOPE
1.1 This test method covers the determination of volatile matter (moisture) in all types of wet blue.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6658–01(Reapproved 2006)
Standard Test Method for
Volatile Matter (Moisture) of Wet Blue by Oven Drying
This standard is issued under the fixed designation D 6658; 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.
1. Scope 4.4 The amount of volatile matter (moisture) released by a
given sample varies with (a) method and time of sample
1.1 This test method covers the determination of volatile
preparation, (b) weight of sample taken, (c) temperature and
matter (moisture) in all types of wet blue.
time of the oven drying, (d) type of oven (gravity versus
1.2 This standard does not purport to address all of the
mechanical convection) used.
safety concerns, if any, associated with its use. It is the
4.5 Because of the above unknown errors, the result of this
responsibility of the user of this standard to establish appro-
test is a purely arbitrary value for the moisture content of the
priate safety and health practices and determine the applica-
sample. It is, therefore, essential that the method be followed
bility of regulatory limitations prior to use.
exactly in order to obtain reproducible results among labora-
2. Referenced Documents tories.This is particularly true if other chemical analytical tests
being performed on the same sample are reported on the
2.1 ASTM Standards:
moisture-free basis.
D 6659 Practice for Sampling and Preparation of Wet Blue
for Physical and Chemical Tests
5. Apparatus
3. Summary of Test Method 5.1 Appropriately sized weighing container with cover suit-
able for oven use.
3.1 The prepared wet blue specimen is heated in a forced air
5.2 Oven, forced air capable of attaining a steady 100-105
ovenfor8to24hat100-105°C,placedinadesiccator,cooled,
°C, with a thermoregulator system. A thermometer accurate to
and reweighed. The loss in weight represents the volatile
1 °C should be used to check and monitor the oven set point.
matter.
5.3 Balance, capable of weighing up to 100 g with an
4. Significance and Use
accuracy of 6 0.001 g.
5.4 Desiccator, any convenient form or size, using any
4.1 Theresultobtainedbythistestisnormallyconsideredto
normal desiccating agent such as calcium sulfate, calcium
be the moisture content of the wet blue sample. This result is
chloride, or silica gel.
used to correct all other chemical tests to a moisture-free basis.
4.2 Materials that are volatile under these conditions, other
6. Sampling
than water, may be present in the wet blue, although their
6.1 TheleathershallbesampledinaccordancewithPractice
amount in any normal wet blue would be expected to be a very
D 6659.
small percentage of the total volatile matter.
4.3 Under the conditions of this test, certain materials in wet
7. Procedure
blue, such as protein fiber and chromium tanning salts, may
7.1 Insert the empty weighing container and cover in the
retain moisture. Other materials, such as natural animal fats,
oven at 100-105 °C for1hor more to insure dryness.
may be oxidized. Both of these effects produce negative errors
7.2 Remove the container and cover from the oven and
in the moisture determination.
place in a desiccator and cool to ambient temperature.
7.3 Weigh the container and cover and record to the nearest
This test method is under the jurisdiction ofASTM Committee D31 on Leather 6 0.001 g.
and is the direct responsibility of Subcommittee D31.02 on Blue Stock.
7.4 Transfer 10-15 g of wet blue prepared as specified in
Current edi
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