ASTM D6659-16(2021)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6659 − 16 (Reapproved 2021)
Standard Practice for
Sampling and Preparation of Wet Blue and Wet White for
Physical and Chemical Tests
This standard is issued under the fixed designation D6659; 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 3.1.1.1 Discussion—Wet Blue andWetWhite in formed lots
should be produced from: (1) Units of product of similar size
1.1 This practice covers the sampling and preparation of
and type. (2) A single product method. (3) Sequential produc-
Wet Blue and Wet White for physical and chemical tests. The
tion batches.
product is grouped into lots that are randomly sampled in such
3.1.1.2 Discussion—In addition to 3.1.1.1, Wet Blue in
a manner as to produce a representative sample of the lot. This
formed lots should be produced from Chromium tanning
sample may be used to determine compliance of the lot with
material obtained from the same producer (or functionally
applicable specification requirements, and on the basis of
equivalent).
results, the lot may be accepted or rejected in its entirety.
3.1.2 unit, n—a piece of Wet Blue or Wet White in the form
1.2 The values stated in inch-pound units are to be regarded
in which it is purchased, such as a single hide, skin, or any part
as standard. The values given in parentheses are mathematical
thereof.
conversions to SI units that are provided for information only
and are not considered standard.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 The sampling procedures described in this practice have
safety concerns, if any, associated with its use. It is the
been designed to ensure random sampling ofWet Blue andWet
responsibility of the user of this standard to establish appro-
Whiteforphysicalandchemicaltests.WetBlueandWetWhite
priate safety, health, and environmental practices and deter-
are natural products and as such are subject to extensive
mine the applicability of regulatory limitations prior to use.
variability. The physical and chemical properties vary consid-
1.4 This international standard was developed in accor-
erably depending on location on the hide, side, or skin from
dance with internationally recognized principles on standard-
which the test sample is taken. Random sampling of specimens
ization established in the Decision on Principles for the
from a predefined location and orientation minimizes test bias
Development of International Standards, Guides and Recom-
and variability. This practice defines these parameters.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Conditioning
2. Referenced Documents 5.1 Unlessotherwisespecifiedintheapplicabletestmethod,
specification, or procurement document, samples shall be
2.1 ASTM Standards:
tempered to the ambient laboratory conditions prior to prepa-
D6658 Test Method for Volatile Matter (Moisture) of Wet
ration of testing.
Blue by Oven Drying
6. Sampling Procedure
3. Terminology
6.1 Prior to sampling, identify the product properly as a lot
3.1 Definitions:
or batch.
3.1.1 lot (or batch), n—units of products from a single type,
grade, class, size, and composition, manufactured under essen-
6.2 Select units from locations scattered throughout the lot,
tially the same conditions and time.
not from the same portion of the lot, such as a single pallet,
carton, layer, etc. Take without regard to quality.
This practice is under the jurisdiction ofASTM Committee D31 on Leather and
6.2.1 The number of samples taken depends on the reliabil-
is the direct responsibility of Subcommittee D31.02 on Wet Blue.
ity of the test results, the deviation of the properties, and the
Current edition approved Sept. 1, 2021. Published October 2021. Originally
error of the testing procedure. The number of samples taken
approved in 2001. Last previous edition approved in 2016 as D6659 – 16. DOI:
10.1520/D6659-16R21.
may be at the discretion of the user and the related test method
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and should also be recorded on the test report. It is recom-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mended that 12 samples be taken for every 50,000 square feet
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. of hide or skin. These 12 shall be considered a lot, or batch.
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D6659 − 16 (2021)
NOTE 1—By reason of the high moisture content of Wet Blue and Wet
breaking strength (grab), bursting strength, stitch tear, shrink-
White, samples should be taken after the wringing operation and imme-
age temperature, tongue tear, stiffness.
diately sealed in airtight plastic wrap. Store in a cool place until used.
6.3.2.6 When cutting specimens for physical tests, areas
6.3 The standard location for sampling Wet Blue and Wet
selected must be free from visual defects
...