ASTM D6658-01

Standard Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying

SCOPE
1.1 This test method covers the determination of volatile matter (moisture) in all types of wet blue.
1.2 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.

General Information

• Status: Historical
• Publication Date: 09-May-2001
• ICS: 59.140.10 - Processes and auxiliary materials
• Technical Committee: D31 - Leather
• Drafting Committee: D31.02 - Wet Blue

Relations

• Replaced By: ASTM D6658-01(2006) - Standard Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying
• Effective Date: 01-Oct-2006
• Referred By: ASTM D6656-16(2021) - Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
• Effective Date: 10-May-2001
• Referred By: ASTM D7967-21 - Standard Test Method for Analysis of Chrome Content (as Cr<inf>2</inf>O<inf>3</inf>) in Wet Blue using Atomic Absorption or ICP
• Effective Date: 10-May-2001
• Referred By: ASTM D7674-14a(2021) - Standard Test Method for Hexane/Petroleum Ether Extract in Wet Blue and Wet White
• Effective Date: 10-May-2001
• Referred By: ASTM D8451-22 - Standard Test Method for Calculation of Unfixed Chrome Concentration in Wet Blue
• Effective Date: 10-May-2001
• Referred By: ASTM D6659-16(2021) - Standard Practice for Sampling and Preparation of Wet Blue and Wet White for Physical and Chemical Tests
• Effective Date: 10-May-2001
• Referred By: ASTM D6714-16(2021) - Standard Test Method for Chromic Oxide in Ashed Wet Blue (Perchloric Acid Oxidation)
• Effective Date: 10-May-2001
• Referred By: ASTM D6716-08(2020) - Standard Test Method for Total Ash in Wet Blue or Wet White
• Effective Date: 10-May-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6658–01
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
E 180 Practice for Determining the Precision of ASTM
5.1 Appropriately sized weighing container with cover suit-
Methods forAnalysis and Testing of Industrial Chemicals
able for oven use.
3. Summary of Test Method 5.2 Oven, forced air capable of attaining a steady 100-105
°C, with a thermoregulator system. A thermometer accurate to
3.1 The prepared wet blue specimen is heated in a forced air
1 °C should be used to check and monitor the oven set point.
ovenfor8to24hat100-105°C,placedinadesiccator,cooled,
5.3 Balance, capable of weighing up to 100 g with an
and reweighed. The loss in weight represents the volatile
accuracy of 6 0.001 g.
matter.
5.4 Desiccator, any convenient form or size, using any
4. Significance and Use
normal desiccating agent such as calcium sulfate, calcium
chloride, or silica gel.
4.1 Theresultobtainedbythistestisnormallyconsideredto
be the moisture content of the wet blue sample. This result is
6. Sampling
used to correct all other chemical tests to a moisture-free basis.
6.1 TheleathershallbesampledinaccordancewithPractice
4.2 Materials that are volatile under these conditions, other
D 6659.
than water, may be present in the wet blue, although their
amount in any normal wet blue would be expected to be a very
7. Procedure
small percentage of the total volatile matter.
7.1 Insert the empty weighing container and cover in the
4.3 Under the conditions of this test, certain materials in wet
oven at 100-105 °C for1hor more to insure dryness.
blue, such as protein fiber and chromium tanning salts, may
7.2 Remove the container and cover from the oven and
retain moisture. Other materials, such as natural animal fats,
place in a desiccator and cool to ambient temperature.
may be oxidized. Both of these effects produce negative errors
7.3 Weigh the container and cover and record to the nearest
in the moisture determination.
6 0.001 g.
7.4 Transfer 10-15 g of wet blu
...