ASTM D6403-99

Standard Test Method for Determining Moisture in Raw and Spent Materials

SCOPE
1.1 This test method is intended for use in determining the moisture content in raw and spent materials that are extracted for tannin analysis. The moisture content of the sample is operationally defined to be equal to the weight loss experienced as a result of the evaporation which occurs in the drying oven.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 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-1999
• ICS: 59.140.10 - Processes and auxiliary materials
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Replaced By: ASTM D6403-99(2004) - Standard Test Method for Determining Moisture in Raw and Spent Materials
• Effective Date: 01-Apr-2004
• Referred By: ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
• Effective Date: 10-May-1999
• Referred By: ASTM D4902-99(2020) - Standard Test Method for Evaporation and Drying of Analytical Solutions
• Effective Date: 10-May-1999
• Referred By: ASTM D6402-99(2020) - Standard Test Method for Determining Soluble Solids and Insolubles in Extracts of Vegetable Tanning Materials
• Effective Date: 10-May-1999
• Referred By: ASTM D6405-99(2020) - Standard Practice for Extraction of Tannins from Raw and Spent Materials
• Effective Date: 10-May-1999
• Referred By: ASTM D6406-99(2020) - Standard Test Method for Analysis of Sugar in Vegetable Tanning Materials
• Effective Date: 10-May-1999
• Referred By: ASTM D4905-99(2020) - Standard Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
• Effective Date: 10-May-1999

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 6403 – 99
Standard Test Method for
Determining Moisture in Raw and Spent Materials
This standard is issued under the fixed designation D 6403; 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 3.1.4 vegetable tannins—mixtures of substances (natural
products) obtained from plant tissues by water extraction
1.1 This test method is intended for use in determining the
which have the chemical and physical properties necessary to
moisture content in raw and spent materials that are extracted
convert animal hides and skins into leather.
for tannin analysis. The moisture content of the sample is
operationally defined to be equal to the weight loss experienced
4. Summary of Test Method
as a result of the evaporation which occurs in the drying oven.
4.1 A specimen of the material sample prepared for use in
1.2 The values stated in SI units are to be regarded as the
Practice D 6405 is dried overnight in a forced-air oven. The
standard.
loss in weight represents the moisture in the specimen.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 This test method is used to determine the moisture
priate safety and health practices and determine the applica-
content of materials (raw or spent) that are to be extracted for
bility of regulatory limitations prior to use.
tannin analysis. The value obtained for moisture content by this
2. Referenced Documents test method is used to calculate the results of the other analyses
on this material to a moisture-free basis.
2.1 ASTM Standards:
5.2 The specimens are obtained from the material prepared
D 6405 Practice for Extraction of Tannins from Raw and
2 for extraction in Practice D 6405.
Spent Materials
5.3 Tanning materials contain moisture in varying amounts,
2.2 ALCA Methods
3 depending both on the nature of the material and on the
A6 Moisture in Raw and Spent Materials
climatic conditions, therefore sampling must be carried out as
3. Terminology quickly as is consistent with thoroughness in order to avoid
changes in moisture content.
3.1 Definitions:
5.4 Negative errors may occur in the moisture determination
3.1.1 raw material—any of the various parts of plants that
because under the conditions of this method there may be
are used as a source of vegetable tannins.
retention of moisture by certain components (for example,
3.1.2 spent material—plant tissue by-products from indus-
hydrated salts or water bound to organic structures) of the raw
trial processes which may contain significant quantities of
or spent material or because of oxidation of other components
vegetable tannins.
(for example, tannins) of the raw or spent material.
3.1.3 tannin—an astringent substance found in the various
5.5 Positive errors may occur in the moisture determination
parts of plants such as bark, wood, leaves, nuts, fruits, roots,
because under the conditions of this test method there may be
etc.
volatilization of certain components of the raw or spent
material other than water.
This test method is under the jurisdiction of ASTM Committee D-31 on Leather
5.6 It is known that other factors can also affect the quantity
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
of volatile matter (moisture) released by the specimen. These
test method has been adapted from and is a replacement for Method A6 of the
factors include but are not limited to: particle size of the test
Official Methods of the American Leather Chemists Association.
specimen, quantity of test specimen, oven temperature, expo-
Current edition approved May 10, 1999. Published August 1999.
Annual Book of ASTM Standards, Vol 15.04.
sure time in the oven, shape of the specimen container, and
Official Methods of the American Leather Chemists Association. Available
type of oven (for example, gravity or mechanical convection)
from the American Leather Chemists Association, University of Cincinnati, P.O.
used.
Box 210014, Cincinnati, OH 45221-0014.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 6403
5.7 Because of the possibility of unknown errors in this test 8.3.1 Place the tannin dish containing the test specimen on
method it is essential that the method be followed exactly in a shelf in the drying oven at 100 6 2.0°C for 17 6 1h.
order to obtain reproducible results both among specimens 8.3.2 Remove the dish from the oven and place it in a
within a laboratory and for analyses between laboratories. dessicator until it has reached temperature equilibrium with the
laboratory environment.
6. Apparatus 8.3.3 Record the weight of the dish with dried material as
W to the nearest 6 0.0001 g.
6.1 Balance, analytical balance which will weigh up to 100
g with an accuracy of 6 0.1 mg (6 0.0001 g).
9. Calculation
6.2 Tannin Dish, crystallizing dish, borosilicate glass, 50
mm tall, 70 mm outside diameter. The bottom corner shall be 9.1 Calculate the percent volatile matter (moisture) in the
rounded to a radius of 6 mm, the bottom shall be flat and not sample material as follows:
cupped in the center, and the top edge shall be rounded and
moisture ~volatile matter!,% 5 @~W 2 W !/~W 2 W !# 3 100
2 3 2 1
polished.
(1)
6.3 Watch Glass, a suitable
...