ASTM D6409-99(2004)

Standard Practice for Color Tests with Sheepskin Skiver

SIGNIFICANCE AND USE
This practice provides a standard procedure for comparing the color of leather tanned with different tanning extracts or mixtures of extracts or for monitoring the color consistency of tannery liquors.
SCOPE
1.1 This practice covers making color tests of all types of vegetable tanning extracts and of vegetable tanning materials to determine the color imparted to tanned skins.
1.2 The values given in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.
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 D6409-99 - Standard Practice for Color Tests with Sheepskin Skiver
• Effective Date: 01-Apr-2004
• Replaced By: ASTM D6409-99(2009) - Standard Practice for Color Tests with Sheepskin Skiver
• Effective Date: 01-Apr-2009
• Referred By: ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6409–99(Reapproved2004)
Standard Practice for
Color Tests with Sheepskin Skiver
This standard is issued under the fixed designation D 6409; 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 sheepskin skiver—the grain split of a de-wooled
sheepskin. A pickled skiver is used for this test.
1.1 This practice covers making color tests of all types of
3.1.4 tannin—an astringent substance found in the various
vegetable tanning extracts and of vegetable tanning materials
parts of plants such as bark, wood, leaves, nuts, fruits, roots,
to determine the color imparted to tanned skins.
etc.
1.2 The values given in SI units are to be regarded as the
3.1.5 vegetable tannins—mixtures of substances (natural
standard. The inch-pound units given in parentheses are for
products) obtained from plant tissues by water extraction
information only.
which have the chemical and physical properties necessary to
1.3 This standard does not purport to address all of the
convert animal hides and skins into leather.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Practice
priate safety and health practices and determine the applica-
4.1 Aspecimen of pickled skiver is tanned with a sample of
bility of regulatory limitations prior to use.
vegetable tanning liquor in order to determine the color which
2. Referenced Documents will be imparted to a clear, clean hide or skin that is tanned
with this tanning liquor.
2.1 ASTM Standards:
D 1517 Definitions of Terms Relating to Leather
5. Significance and Use
D 4901 Practice for Preparation of Solution of Liquid Veg-
5.1 This practice provides a standard procedure for compar-
etable Tannin Extracts
ingthecolorofleathertannedwithdifferenttanningextractsor
D 4905 Practice for Preparation of Solution of Solid, Pasty,
mixtures of extracts or for monitoring the color consistency of
and Powdered Vegetable Tannin Extracts
tannery liquors.
D 6405 Practice for Extraction of Tannins from Raw and
Spent Materials
6. Apparatus and Reagents
2.2 ALCA Methods:
6.1 Pickled Sheepskin Skiver, specially and consistently
A40 Color Tests with Sheepskin Skiver
selected for the color test.
6.2 Borax, commercial grade such as may be used in a
3. Terminology
tannery.
3.1 Definitions:
6.3 Containers, 10 and 3 L capacity and made of suitable
3.1.1 For definitions of general leather and tanning terms
material to be resistant to the chemicals and materials used in
used in this practice refer to Definitions D 1517.
the tanning procedure employed by this practice.
3.1.2 pickled skiver—a sheepskin skiver that has been
6.4 Acetic Acid, glacial, commercial grade.
pickled in a solution of salt and sulfuric acid.
6.5 Sodium Acetate, crystal, commercial grade.
6.6 Sodium Chloride, crystal, commercial grade.
6.7 Shake Bottles, 0.95 L(32 oz), with rubber stoppers. The
Thispracticeisunderthe jurisdiction ofASTM Committee D31 onLeatherand
bottles shall be approximately 21.6 cm (8.5 in.) overall height
is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This test
and 8.9 cm (3.5 in.) diameter. One quart canning jars (Mason-
method has been adapted from and is a replacement for MethodA40 of the Official
Methods of the American Leather Chemists Association.
type) with plastic screw-on lids work well.
Current edition approved April 1, 2004. Published May 2004. Originally
6.8 Shaking Machine,rotatingtype,equippedtohold0.95L
approved in 1999. Last previous edition approved in 1999 as D 6409 – 99.
2 (32 oz) bottles for end-over-end agitation of hide powder and
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
analytical solution. The speed of rotation shall be 606 2 rpm,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
and the machine shall be so constructed that the side of the
the ASTM website.
shake bottle adjacent to the rotating shaft shall be not less than
Official Methods of the American Leather Chemists Association. Available
5.1 cm (2 in.) nor more than 7.6 cm (3 in.) from the center of
from the American Leather Chemists Association, University of Cincinnati, P.O.
Box 210014, Cincinnati, OH 45221-0014. the shaft.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6409–99 (2004)
6.9 Flat Dish, 250 to 300 mL capacity; a photographic tray 9.2 Tanning Method I (Shake Method):
works well.
9.2.
...