ASTM D6658-08(2020)
(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
4.1 The result obtained by this test is normally considered to be the moisture content of the wet blue or wet white sample. This result is used to correct all other chemical tests to a moisture-free basis.
4.2 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.
4.3 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.
4.4 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.
4.5 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 and wet white.
1.2 This test method was originally developed for wet blue, however, this test method can be used to test wet white. For wet white testing, substitute the term wet white for wet blue in the standard.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6658 − 08 (Reapproved 2020)
Standard Test Method for
Volatile Matter (Moisture) of Wet Blue by Oven Drying
This standard is issued under the fixed designation D6658; 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.
1. Scope 4. Significance and Use
4.1 Theresultobtainedbythistestisnormallyconsideredto
1.1 This test method covers the determination of volatile
be the moisture content of the wet blue or wet white sample.
matter (moisture) in all types of wet blue and wet white.
This result is used to correct all other chemical tests to a
1.2 This test method was originally developed for wet blue,
moisture-free basis.
however,thistestmethodcanbeusedtotestwetwhite.Forwet
4.2 Materials that are volatile under these conditions, other
white testing, substitute the term wet white for wet blue in the
than water, may be present in the wet blue, although their
standard.
amount in any normal wet blue would be expected to be a very
1.3 The values stated in SI units are to be regarded as
small percentage of the total volatile matter.
standard. No other units of measurement are included in this
4.3 Under the conditions of this test, certain materials in wet
standard.
blue, such as protein fiber and chromium tanning salts, may
1.4 This standard does not purport to address all of the
retain moisture. Other materials, such as natural animal fats,
safety concerns, if any, associated with its use. It is the
may be oxidized. Both of these effects produce negative errors
responsibility of the user of this standard to establish appro-
in the moisture determination.
priate safety, health, and environmental practices and deter-
4.4 The amount of volatile matter (moisture) released by a
mine the applicability of regulatory limitations prior to use.
given sample varies with (a) method and time of sample
1.5 This international standard was developed in accor-
preparation, (b) weight of sample taken, (c) temperature and
dance with internationally recognized principles on standard-
time of the oven drying, (d) type of oven (gravity versus
ization established in the Decision on Principles for the
mechanical convection) used.
Development of International Standards, Guides and Recom-
4.5 Because of the above unknown errors, the result of this
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 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 labora-
2. Referenced Documents
tories.This is particularly true if other chemical analytical tests
2.1 ASTM Standards:
being performed on the same sample are reported on the
D6659 Practice for Sampling and Preparation of Wet Blue
moisture-free basis.
and Wet White 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 or wet white specimen is heated
in a forced air oven for 8 to 24 h at 100-105 °C, placed in a
5.2 Oven, forced air capable of attaining a steady 100-105
desiccator, cooled, and reweighed. The loss in weight repre-
°C, with a thermoregulator system. A thermometer accurate to
sents the volatile matter.
1 °C should be used to check and monitor the oven set point.
5.3 Balance, capable of weighing up to 100 g with an
accuracy of 6 0.001 g.
This test method is under the jurisdiction ofASTM Committee D31 on Leather
5.4 Desiccator, any convenient form or size, using any
and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
normal desiccating agent such as calcium sulfate, calcium
Current edition approved April 1, 2020. Published April 2020. Originally
approved in 2001. Last previous edition approved in 2013 as D6658 –
...
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