ASTM D6715-08
(Practice)Standard Practice for Sampling and Preparation of Salt Preserved (Cured) Hides and Skins for Chemical and Physical Tests
Standard Practice for Sampling and Preparation of Salt Preserved (Cured) Hides and Skins for Chemical and Physical Tests
SIGNIFICANCE AND USE
The sampling procedures described in this practice have been designed to ensure random sampling of salt-preserved hides and skins for physical and chemical tests. Salt-preserved hides are natural products and as such are subject to extensive variability. The physical and chemical properties vary considerably depending on location on that specific 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.
In general, tests carried out upon salt-preserved hides require composite lot samples generated using the preparation methods described within this practice. Subsequent tests typically require those composite samples to be in two forms:
Expressed Hide Fluid—where residual hide fluid is pressed from each de-haired and cleaned individual hide sample, then equal volumes of each extracted fluid are blended together to create the composite sample.
Hide Material Sample—where equal quantities of de-haired and cleaned hide material are blended together to create a representative composite sample.
SCOPE
1.1 This practice covers the sampling and preparation of salt-preserved (cured) hides for physical and chemical tests. The hides or skins to be tested are grouped into lots. Each lot is randomly sampled in such a manner as to produce a representative sample of that lot. This lot 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.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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.
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Designation: D6715 − 08
StandardPractice for
Sampling and Preparation of Salt Preserved (Cured) Hides
1
and Skins for Chemical and Physical Tests
This standard is issued under the fixed designation D6715; 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 2.1.5.1 Discussion—Salt-preserved hides in formed lots
should be produced from:
1.1 This practice covers the sampling and preparation of
(1) Units of product of similar size and type,
salt-preserved (cured) hides for physical and chemical tests.
(2) Salt-preserved hides obtained from the same producer
The hides or skins to be tested are grouped into lots. Each lot
(functionally equivalent),
is randomly sampled in such a manner as to produce a
(3) A single product method, or
representative sample of that lot. This lot sample may be used
(4) Sequential production batches.
todeterminecomplianceofthelotwithapplicablespecification
requirements, and on the basis of results, the lot may be 2.1.6 salt preservation (cure)—is defined as the action of
applying salt (typically sodium chloride) to flayed hides in
accepted or rejected in its entirety.
order to make them temporarily resistant to degradation by
1.2 The values stated in inch-pound units are to be regarded
bacterial (enzymatic) action. Typically, this is achieved by
as standard. The values given in parentheses are mathematical
either brine-curing or wet-salting (salt-packing).
conversions to SI units that are provided for information only
2.1.7 salt-preserved (cured) hides—are defined as hides that
and are not considered standard.
have been processed into a condition that makes them tempo-
1.3 This standard does not purport to address all of the
rarily resistant to degradation by bacterial (enzymatic) action.
safety concerns, if any, associated with its use. It is the
This is achieved by the application of adequate salt (typically
responsibility of the user of this standard to establish appro-
sodium chloride) to the hide.
priate safety and health practices and determine the applica-
2.1.8 unit—an item of salt-preserved hide in the form in
bility of regulatory limitations prior to use.
which it is purchased, such as a single hide, skin, or any part
2. Terminology
thereof.
2.1 Definitions:
2.1.9 wet-salting (salt-pack)—the action of applying suffi-
2.1.1 brine-curing—preserving by immersing flayed hides cient granular salt (sodium chloride) to flayed hides (normally
into concentrated/saturated salt (sodium chloride) solution
upon the flesh side) over sufficient time, in order to have the
until sufficient salt has been absorbed by the hide, thus making
salt absorbed by the hide, making it temporarily resistant to
it temporarily resistant to bacterial action (cured). bacterial action (cured).
2.1.2 cure—commonly used industry reference to salt pres-
3. Significance and Use
ervation.
2.1.3 cured hides (salted hides)—commonly used industry 3.1 The sampling procedures described in this practice have
been designed to ensure random sampling of salt-preserved
term for salt-preserved hides.
hides and skins for physical and chemical tests. Salt-preserved
2.1.4 laboratory terms—any laboratory terms and defini-
hides are natural products and as such are subject to extensive
tions employed within this practice are commonly used in
variability. The physical and chemical properties vary consid-
normal laboratory practice and require no special comment.
erably depending on location on that specific hide, side, or skin
2.1.5 lot (or batch)—units of products from a single type,
from which the test sample is taken. Random sampling of
grade, class, size, and composition, manufactured under essen-
specimens from a predefined location and orientation mini-
tially the same conditions and time.
mizes test bias and variability. This practice defines these
parameters.
1
This practice is under the jurisdiction ofASTM Committee D31 on Leather and
3.2 In general, tests carried out upon salt-preserved hides
is the direct responsibility of Subcommittee D31.02 on Wet Blue.
require composite lot samples generated using the preparation
Current edition approved Sept. 1, 2008. Published October 2008. Originally
methods described within this practice. Subsequent tests typi-
approved in 2001. Last previous edition approved in 2007 as D6715-01(2007). DOI:
10.1520/D6715-08. cally require those composite samples to be in two forms:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6715 − 08
NOTE1—Byreasonofpossiblehighmoi
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D6715–01(Reapproved2007) Designation: D 6715 – 08
Standard Practice for
Sampling and Preparation of Salt Preserved (Cured) Hides
1
and Skins for Chemical and Physical Tests
This standard is issued under the fixed designation D 6715; 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
1.1 This practice covers the sampling and preparation of salt-preserved (cured) hides for physical and chemical tests. The hides
or skins to be tested are grouped into lots. Each lot is randomly sampled in such a manner as to produce a representative sample
of that lot. This lot 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.
1.2
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered 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.
2. Terminology
2.1 Definitions:
2.1.1 brine-curing—preserving by immersing flayed hides into concentrated/saturated salt (sodium chloride) solution until
sufficient salt has been absorbed by the hide, thus making it temporarily resistant to bacterial action (cured).
2.1.2 cure—commonly used industry reference to salt preservation.
2.1.3 cured hides (salted hides)—commonly used industry term for salt-preserved hides.
2.1.4 laboratory terms—any laboratory terms and definitions employed within this practice are commonly used in normal
laboratory practice and require no special comment.
2.1.5 lot (or batch)—units of products from a single type, grade, class, size, and composition, manufactured under essentially
the same conditions and time.
2.1.5.1 Discussion—Salt-preserved hides in formed lots should be produced from:
(1) Units of product of similar size and type,
(2) Salt-preserved hides obtained from the same producer (functionally equivalent),
(3) A single product method, or
(4) Sequential production batches.
2.1.6 salt preservation (cure)—is defined as the action of applying salt (typically sodium chloride) to flayed hides in order to
make them temporarily resistant to degradation by bacterial (enzymatic) action. Typically, this is achieved by either brine-curing
or wet-salting (salt-packing).
2.1.7 salt-preserved (cured) hides—are defined as hides that have been processed into a condition that makes them temporarily
resistant to degradation by bacterial (enzymatic) action. This is achieved by the application of adequate salt (typically sodium
chloride) to the hide.
2.1.8 unit—an item of salt-preserved hide in the form in which it is purchased, such as a single hide, skin, or any part thereof.
2.1.9 wet-salting (salt-pack)—the action of applying sufficient granular salt (sodium chloride) to flayed hides (normally upon
the flesh side) over sufficient time, in order to have the salt absorbed by the hide, making it temporarily resistant to bacterial action
(cured).
3. Significance and Use
3.1 The sampling procedures described in this practice have been designed to ensure random sampling of salt-preserved hides
and skins for physical and chemical tests. Salt-preserved hides are natural products and as such are subject to extensive variability.
1
This practice is under the jurisdiction of ASTM Committee D31 on Leather and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
Current edition approved Sept. 1, 2007.2008. Published September 2007.October 2008. Originally approved in 2001. Last previous edition approved in 20012007 as
D 6715-01(2007).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D6715–08
The physical and chemical properties vary considerably depending on location on that specific 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
...
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