ASTM D6659-01(2007)
(Practice)Standard Practice for Sampling and Preparation of Wet Blue for Physical and Chemical Tests
Standard Practice for Sampling and Preparation of Wet Blue for Physical and Chemical Tests
SIGNIFICANCE AND USE
The sampling procedures described in this practice have been designed to ensure random sampling of wet blue for physical and chemical tests. Wet blue is a natural product and as such is subject to extensive variability. The physical and chemical properties vary considerably depending on location on the hide, side, or skin from which the test sample is taken. Random sampling of specimens from a predefined location and orientation minimizes test bias and variability. This practice defines these parameters.
SCOPE
1.1 This practice covers the sampling and preparation of wet blue for physical and chemical tests. The product is grouped into lots that are randomly sampled in such a manner as to produce a representative sample of the lot. This sample may be used to determine compliance of the lot with applicable specification requirements, and on the basis of results, the lot may be accepted or rejected in its entirety.
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.
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Designation:D6659–01(Reapproved2007)
Standard Practice for
Sampling and Preparation of Wet Blue for Physical and
Chemical Tests
This standard is issued under the fixed designation D 6659; 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 orientation minimizes test bias and variability. This practice
defines these parameters.
1.1 Thispracticecoversthesamplingandpreparationofwet
blue for physical and chemical tests. The product is grouped
4. Conditioning
into lots that are randomly sampled in such a manner as to
4.1 Chemical and physical tests of wet blue, unless other-
produce a representative sample of the lot.This sample may be
wise specified in the applicable test method, specification, or
used to determine compliance of the lot with applicable
procurement document, shall be performed under standard
specification requirements, and on the basis of results, the lot
atmospheric conditions, which is 50 6 4% relative humidity at
may be accepted or rejected in its entirety.
a temperature of 23 6 1 °C (73.4 6 2 °F). If testing conditions
1.2 This standard does not purport to address all of the
vary from this standard the actual conditions must be included
safety concerns, if any, associated with its use. It is the
in the report of all such tests.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Sampling Procedure
bility of regulatory limitations prior to use.
5.1 Prior to sampling, identify the product properly as a lot
2. Terminology or batch.
5.2 Select units from locations scattered throughout the lot,
2.1 Definitions:
not from the same portion of the lot, such as a single pallet,
2.1.1 lot (or batch), n—units of products from a single type,
carton, layer, etc. Take without regard to quality.
grade, class, size, and composition, manufactured under essen-
5.2.1 The number of samples taken depends on the reliabil-
tially the same conditions and time.
ity of the test results, the deviation of the properties, and the
2.1.1.1 Discussion—Wet blue in formed lots should be
error of the testing procedure. The number of samples taken
produced from: (1) Units of product of similar size and type.
may be at the discretion of the user and the related test method
(2) Chromium tanning material obtained from the same pro-
and should also be recorded on the test report. It is recom-
ducer(orfunctionallyequivalent).(3)Asingleproductmethod.
mended that 12 samples be taken for every 50,000 square feet
(4) Sequential production batches.
of hide or skin. These 12 shall be considered a lot, or batch.
2.1.2 unit, n—a piece of wet blue in the form in which it is
purchased, such as a single hide, skin, or any part thereof.
NOTE 1—By reason of the high moisture content of wet blue, samples
should be taken after the wringing operation and immediately sealed in
3. Significance and Use
airtight plastic wrap. Store in a cool place until used.
3.1 The sampling procedures described in this practice have
5.3 The standard location for sampling wet blue is the
been designed to ensure random sampling of wet blue for
kidney area (designated as TEST AREA “a”in Fig. 1).
physical and chemical tests. Wet blue is a natural product and
Sampling in the belly or shoulder area is only applicable if that
as such is subject to extensive variability. The physical and
is the end product being sold or purchased:
chemical properties vary considerably depending on location
5.3.1 Skins—Cut the test piece to the size and shape
on the hide, side, or skin from which the test sample is taken.
required for the tests to be made, with one edge parallel to and
Random sampling of specimens from a predefined location and
1 in. (25.4 mm) from the backbone line, beginning 3 in. (76
mm) from the root of the tail. Pieces shall be cut from only one
side of the backbone of each skin. The test area for skins
This practice is under the jurisdiction ofASTM Committee D31 on Leather and
corresponds to area a for cat
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