ASTM D6403-99(2004)

Standard Test Method for Determining Moisture in Raw and Spent Materials

SIGNIFICANCE AND USE
This test method is used to determine the moisture content of materials (raw or spent) that are to be extracted for tannin analysis. The value obtained for moisture content by this test method is used to calculate the results of the other analyses on this material to a moisture-free basis.  
The specimens are obtained from the material prepared for extraction in Practice D 6405.
Tanning materials contain moisture in varying amounts, depending both on the nature of the material and on the climatic conditions, therefore sampling must be carried out as quickly as is consistent with thoroughness in order to avoid changes in moisture content.
Negative errors may occur in the moisture determination because under the conditions of this method there may be retention of moisture by certain components (for example, hydrated salts or water bound to organic structures) of the raw or spent material or because of oxidation of other components (for example, tannins) of the raw or spent material.
Positive errors may occur in the moisture determination because under the conditions of this test method there may be volatilization of certain components of the raw or spent material other than water.
It is known that other factors can also affect the quantity of volatile matter (moisture) released by the specimen. These factors include but are not limited to: particle size of the test specimen, quantity of test specimen, oven temperature, exposure time in the oven, shape of the specimen container, and type of oven (for example, gravity or mechanical convection) used.
Because of the possibility of unknown errors in this test method it is essential that the method be followed exactly in order to obtain reproducible results both among specimens within a laboratory and for analyses between laboratories.
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: 31-Mar-2004
• ICS: 59.140.10 - Processes and auxiliary materials
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Replaces: ASTM D6403-99 - Standard Test Method for Determining Moisture in Raw and Spent Materials
• Effective Date: 01-Apr-2004
• Replaced By: ASTM D6403-99(2009) - Standard Test Method for Determining Moisture in Raw and Spent Materials
• Effective Date: 01-Apr-2009
• Referred By: ASTM D4905-99(2020) - Standard Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
• Effective Date: 01-Apr-2004
• Referred By: ASTM D4902-99(2020) - Standard Test Method for Evaporation and Drying of Analytical Solutions
• Effective Date: 01-Apr-2004
• Referred By: ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
• Effective Date: 01-Apr-2004
• Referred By: ASTM D6406-99(2020) - Standard Test Method for Analysis of Sugar in Vegetable Tanning Materials
• Effective Date: 01-Apr-2004
• Referred By: ASTM D6402-99(2020) - Standard Test Method for Determining Soluble Solids and Insolubles in Extracts of Vegetable Tanning Materials
• Effective Date: 01-Apr-2004
• Referred By: ASTM D6405-99(2020) - Standard Practice for Extraction of Tannins from Raw and Spent Materials
• Effective Date: 01-Apr-2004

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:D6403–99(Reapproved2004)
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 3.1.3 tannin—an astringent substance found in the various
parts of plants such as bark, wood, leaves, nuts, fruits, roots,
1.1 This test method is intended for use in determining the
etc.
moisture content in raw and spent materials that are extracted
3.1.4 vegetable tannins—mixtures of substances (natural
for tannin analysis. The moisture content of the sample is
products) obtained from plant tissues by water extraction
operationallydefinedtobeequaltotheweightlossexperienced
which have the chemical and physical properties necessary to
as a result of the evaporation which occurs in the drying oven.
convert animal hides and skins into leather.
1.2 The values stated in SI units are to be regarded as the
standard.
4. Summary of Test Method
1.3 This standard does not purport to address all of the
4.1 A specimen of the material sample prepared for use in
safety concerns, if any, associated with its use. It is the
Practice D 6405 is dried overnight in a forced-air oven. The
responsibility of the user of this standard to establish appro-
loss in weight represents the moisture in the specimen.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Significance and Use
2. Referenced Documents 5.1 This test method is used to determine the moisture
2 content of materials (raw or spent) that are to be extracted for
2.1 ASTM Standards:
tanninanalysis.Thevalueobtainedformoisturecontentbythis
D 6405 Practice for Extraction of Tannins from Raw and
test method is used to calculate the results of the other analyses
Spent Materials
on this material to a moisture-free basis.
2.2 ALCA Methods
3 5.2 The specimens are obtained from the material prepared
A6 Moisture in Raw and Spent Materials
for extraction in Practice D 6405.
3. Terminology 5.3 Tanning materials contain moisture in varying amounts,
depending both on the nature of the material and on the
3.1 Definitions:
climatic conditions, therefore sampling must be carried out as
3.1.1 raw material—any of the various parts of plants that
quickly as is consistent with thoroughness in order to avoid
are used as a source of vegetable tannins.
changes in moisture content.
3.1.2 spent material—plant tissue by-products from indus-
5.4 Negativeerrorsmayoccurinthemoisturedetermination
trial processes which may contain significant quantities of
because under the conditions of this method there may be
vegetable tannins.
retention of moisture by certain components (for example,
hydrated salts or water bound to organic structures) of the raw
This test method is under the jurisdiction ofASTM Committee D31 on Leather
or spent material or because of oxidation of other components
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
(for example, tannins) of the raw or spent material.
test method has been adapted from and is a replacement for Method A6 of the
5.5 Positive errors may occur in the moisture determination
Official Methods of the American Leather Chemists Association.
Current edition approved April 1, 2004. Published May 2004. Originally
because under the conditions of this test method there may be
approved in 1999. Last previous edition approved in 1999 as D 6403 – 99.
volatilization of certain components of the raw or spent
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
material other than water.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.6 It is known that other factors can also affect the quantity
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
of volatile matter (moisture) released by the specimen. These
Official Methods of the American Leather Chemists Association. Available
factors include but are not limited to: particle size of the test
from the American Leather Chemists Association, University of Cincinnati, P.O.
Box 210014, Cincinnati, OH 45221-0014.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6403–99 (2004)
that no weighings of samples be carried out if the humidity of the
specimen, quantity of test specimen, oven temperature, expo-
atmosphere at the balance varies by more than 6 20 % from the humidity
sure time in the oven, shape of the specimen container, and
conditions under which the sample was equilibrated.
type of oven (for example, gravity or mechanical convection)
used.
8.3 Oven Drying:
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 61h.
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
...