ASTM D3790-79(2012)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D3790 − 79 (Reapproved 2012)
Standard Test Method for
Volatile Matter (Moisture) of Leather by Oven Drying
This standard is issued under the fixed designation D3790; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4.2 Materials that are volatile under these conditions, other
thanwater,maybepresentintheleather,althoughtheiramount
1.1 This test method covers the determination of volatile
in any normal leather would be expected to be a very small
matter (moisture) in all types of leather.
percentage of the total volatile matter.
1.2 The values stated in SI units are to be regarded as
4.3 Under the conditions of this test, certain materials in
standard. No other units of measurement are included in this
leather, such as protein fiber and chromium tanning salts, may
standard.
retain moisture. Other materials, such as tannins and oils, may
1.3 This standard does not purport to address all of the
be oxidized. Both of these effects produce negative errors in
safety concerns, if any, associated with its use. It is the
the moisture determination.
responsibility of the user of this standard to establish appro-
4.4 The amount of volatile matter (moisture) released by a
priate safety and health practices and determine the applica-
given leather varies with (a) degree of grinding of the sample,
bility of regulatory limitations prior to use.
(b) weight of sample taken, (c) temperature and time of the
oven drying, (d) shape of the weighing container, and (e) type
2. Referenced Documents
of oven (gravity versus mechanical convection) used.
2.1 ASTM Standards:
4.5 Because of the above unknown errors, the result of this
D2813 Practice for Sampling Leather for Physical and
test is a purely arbitrary value for the moisture content of the
Chemical Tests
sample. It is, therefore, essential that the method be followed
E180 Practice for Determining the Precision of ASTM
exactly in order to obtain reproducible results among labora-
Methods for Analysis and Testing of Industrial and Spe-
tories.This is particularly true if other chemical analytical tests
cialty Chemicals (Withdrawn 2009)
being performed on the same sample are reported on the
moisture-free basis.
3. Summary of Test Method
3.1 The ground leather specimen is heated in a mechanical-
5. Apparatus
convection oven for 16 h at 100°C, placed in a desiccator,
5.1 Weighing Bottle , glass, low-form, cylindrical with a
cooled, and reweighed. The loss in weight represents the
ground-glassstopperofstandardtaper.Thebottleshallhave70
volatile matter.
6 5 mm inside diameter, and 33 6 3 mm overall height.
4. Significance and Use
5.2 Oven, mechanical-convection draft capable of setting at
100°C, with a thermoregulator system capable of holding oven
4.1 Theresultobtainedbythistestisnormallyconsideredto
temperature within 6 2°C of set point.Athermometer accurate
be the moisture content of the leather sample. This result is
to 60.2°C should be used to check and monitor the oven set
used to correct all other chemical tests to a moisture-free basis.
point.
5.3 Balance, capable of weighing up to 100 g with an
1 accuracy of 60.001 g.
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.06 on Chemical Analysis.
5.4 Desiccator, any convenient form or size, using any
Current edition approved April 1, 2012. Published April 2012. Originally
´1
normal desiccating agent such as calcium sulfate, calcium
approved in 1979. Last previous edition approved in 2006 as D3790 - 79(2006) .
DOI: 10.1520/D3790-79R12.
chloride, or silica gel.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Weighing bottles that have been found to be satisfactory are the Kimble Glass
The last approved version of this historical standard is referenced on Co. No. 15166 and 15165 with 71/15 standard-taper caps and are available from
www.astm.org. most laboratory supply houses.
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