ASTM D6409-99(2009)

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-2009
• ICS: 59.140.10 - Processes and auxiliary materials
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Replaces: ASTM D6409-99(2004) - 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-2009

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 (Reapproved2009)
Standard Practice for
Color Tests with Sheepskin Skiver
This standard is issued under the fixed designation D6409; 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.
1. Scope 3.1.2 pickled skiver—a sheepskin skiver that has been pick-
led in a solution of salt and sulfuric acid.
1.1 This practice covers making color tests of all types of
3.1.3 sheepskin skiver—the grain split of a de-wooled
vegetable tanning extracts and of vegetable tanning materials
sheepskin. A pickled skiver is used for this test.
to determine the color imparted to tanned skins.
3.1.4 tannin—an astringent substance found in the various
1.2 The values given in SI units are to be regarded as the
parts of plants such as bark, wood, leaves, nuts, fruits, roots,
standard. The inch-pound units given in parentheses are for
etc.
information only.
3.1.5 vegetable tannins—mixtures of substances (natural
1.3 This standard does not purport to address all of the
products) obtained from plant tissues by water extraction
safety concerns, if any, associated with its use. It is the
which have the chemical and physical properties necessary to
responsibility of the user of this standard to establish appro-
convert animal hides and skins into leather.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Summary of Practice
4.1 Aspecimen of pickled skiver is tanned with a sample of
2. Referenced Documents
vegetable tanning liquor in order to determine the color which
2.1 ASTM Standards:
will be imparted to a clear, clean hide or skin that is tanned
D1517 Terminology Relating to Leather
with this tanning liquor.
D4901 Practice for Preparation of Solution of Liquid Veg-
etable Tannin Extracts
5. Significance and Use
D4905 Practice for Preparation of Solution of Solid, Pasty
5.1 This practice provides a standard procedure for compar-
and Powdered Vegetable Tannin Extracts
ing the color of leather tanned with different tanning extracts or
D6405 Practice for Extraction of Tannins from Raw and
mixtures of extracts or for monitoring the color consistency of
Spent Materials
tannery liquors.
2.2 ALCA Methods:
A40 Color Tests with Sheepskin Skiver 6. Apparatus and Reagents
6.1 Pickled Sheepskin Skiver, specially and consistently
3. Terminology
selected for the color test.
3.1 Definitions:
6.2 Borax, commercial grade such as may be used in a
3.1.1 For definitions of general leather and tanning terms
tannery.
used in this practice refer to Terminology D1517.
6.3 Containers, 10 and 3 L capacity and made of suitable
material to be resistant to the chemicals and materials used in
the tanning procedure employed by this practice.
This practice is under the jurisdiction ofASTM Committee D31 on Leather and
is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This test 6.4 Acetic Acid, glacial, commercial grade.
method has been adapted from and is a replacement for MethodA40 of the Official
6.5 Sodium Acetate, crystal, commercial grade.
Methods of the American Leather Chemists Association.
Current edition approved April 1, 2009. Published July 2009. Originally
6.6 Sodium Chloride, crystal, commercial grade.
approved in 1999. Last previous edition approved in 2004 as D6409 – 99 (2004).
DOI: 10.1520/D6409-99R09.
6.7 Shake Bottles, 0.95 L(32 oz), with rubber stoppers. The
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
bottles shall be approximately 21.6 cm (8.5 in.) overall height
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
and 8.9 cm (3.5 in.) diameter. One quart canning jars (Mason-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. type) with plastic screw-on lids work well.
Official Methods of the American Leather Chemists Association. Available
6.8 Shaking Machine, rotating type, equipped to hold 0.95 L
from the American Leather Chemists Association, University of Cincinnati, P.O.
Box 210014, Cincinnati, OH 45221-0014. (32 oz) bottles for end-over-end agitation of hide powder and
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6409 − 99 (2009)
analytical solution. The speed of rotation shall be 606 2 rpm, 9. Procedure for Making Color Tests
and the machine shall be so constructed that the side of the
9.1 Remove the salt from the skiver sample 10 by 15 cm (4
shake bottle adjacent to the rotating shaft shall be not less than
by6in.)byshakingwithfourchangesofdistilledwater,of500
5.1 cm (2 in.) nor more than 7.6 cm (3 in.) from the center of
mL e
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