ASTM D6076-08
(Test Method)Standard Test Method for Shrinkage Temperature of Leather
Standard Test Method for Shrinkage Temperature of Leather
SIGNIFICANCE AND USE
5.1 This test method is designed to determine the temperature at which a thoroughly wetted leather specimen experiences shrinkage. In this test method, shrinkage occurs as a result of hydrothermal denaturation of the collagen protein molecules which make up the fiber structure of the leather. The shrinkage temperature of leather is influenced by many different factors, most of which appear to affect the number and nature of crosslinking interactions between adjacent polypeptide chains of the collagen protein molecules. The value of the shrinkage temperature of leather is commonly used as an indicator of the type of tannage or the degree of tannage, or both, of that particular leather (especially for the more hydrothermally stable tannages such as chrome tannage).
SCOPE
1.1 This test method covers the determination of the shrinkage temperature of all types of leather. The heating medium is water when the shrinkage temperature is at or below 98°C. The heating medium is a glycerine-water solution when the shrinkage temperature is above 98°C.
1.2 The values stated in SI units are to be regarded as the standard. The values 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.
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Designation: D6076 − 08
StandardTest Method for
1
Shrinkage Temperature of Leather
This standard is issued under the fixed designation D6076; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4. Summary of Test Method
4.1 Aleather specimen is thoroughly soaked in the aqueous
1.1 This test method covers the determination of the shrink-
medium that will be used to heat the specimen for this test
age temperature of all types of leather. The heating medium is
method. This specimen is then fastened between two clamps
water when the shrinkage temperature is at or below 98°C.The
(one fixed and one movable) and immersed in the aqueous
heating medium is a glycerine-water solution when the shrink-
medium. The aqueous medium is gradually heated until the
age temperature is above 98°C.
specified temperature is reached without shrinkage or until
1.2 The values stated in SI units are to be regarded as the
shrinkage is indicated by a deflection of the dial needle which
standard. The values given in parentheses are for information
is attached to the movable clamp.
only.
5. Significance and Use
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5.1 This test method is designed to determine the tempera-
responsibility of the user of this standard to establish appro- tureatwhichathoroughlywettedleatherspecimenexperiences
priate safety and health practices and determine the applica-
shrinkage. In this test method, shrinkage occurs as a result of
bility of regulatory limitations prior to use. hydrothermal denaturation of the collagen protein molecules
which make up the fiber structure of the leather. The shrinkage
2. Referenced Documents temperature of leather is influenced by many different factors,
most of which appear to affect the number and nature of
2
2.1 ASTM Standards:
crosslinking interactions between adjacent polypeptide chains
D1517 Terminology Relating to Leather
of the collagen protein molecules. The value of the shrinkage
temperature of leather is commonly used as an indicator of the
3. Terminology
type of tannage or the degree of tannage, or both, of that
3.1 Definitions—For definitions of general leather terms particular leather (especially for the more hydrothermally
used in this test method, refer to Terminology D1517. stable tannages such as chrome tannage).
3.2 Definitions of Terms Specific to This Standard:
6. Apparatus
3.2.1 shrink—to contract or become smaller.
6.1 Stand, for supporting the testing equipment.
3.2.2 shrinkage—the temperature at which noticeable
6.2 Indicating Device, either of the two devices listed as
shrinkage occurs when a leather specimen is gradually heated
follows:
in an aqueous medium.
6.2.1 Theis Shrinkage Meter Dial—a dial indicator having a
face divided into 360 to 380°, with one revolution of the dial
hand corresponding to 12.7 mm (0.5 in.) of specimen
1
This test method is under the jurisdiction ofASTM Committee D31 on Leather
movement, and with leeway for four revolutions of the dial
andisthedirectresponsibilityofSubcommitteeD31.07onPhysicalProperties.This 3
hand.
test method was developed from Federal Test Method Standard No. 311, Method
6.2.2 AGD (American Gage Design) Dial Indicator—A
7011.1, in cooperation with the U.S. Defense Personnel Support Center, Directorate
of Clothing and Textiles, Philadelphia, PA and the U.S. Army Natick Research,
mechanical device capable of registering on a scale a reading
Development and Engineering Center, Natick, MA.
Current edition approved Sept. 1, 2008. Published October 2008. Originally
3
approved in 1997. Last previous edition approved in 2003 as D6076-03. DOI: A shrinkage meter apparatus setup meeting these specific requirements was
10.1520/D6076-08. formerly available from theArthur H.Thomas Co., Philadelphia, PA.The minimum
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or number of apparatus setups required for an order makes the cost of new apparatus
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM of this type prohibitive. Used apparatus of this type may still be available from
Standards volume information, refer to the standard’s Document Summary page on tanneries or laboratories that have gone out of business or from used equipment
the ASTM website. dealers.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D 6076–03 Designation:D 6076–08
Standard Test Method for
1
Shrinkage Temperature of Leather
This standard is issued under the fixed designation D 6076; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 This test method covers the determination of the shrinkage temperature of all types of leather. The heating medium is water
when the shrinkage temperature is at or below 98°C. The heating medium is a glycerine-water solution when the shrinkage
temperature is above 98°C.
1.2 The values stated in SI units are to be regarded as the standard. The values 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1517 Terminology Relating to Leather
3. Terminology
3.1 Definitions—For definitions of general leather terms used in this test method, refer to Terminology D 1517.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 shrink—to contract or become smaller.
3.2.2 shrinkage—the temperature at which noticeable shrinkage occurs when a leather specimen is gradually heated in an
aqueous medium.
4. Summary of Test Method
4.1 Aleather specimen is thoroughly soaked in the aqueous medium that will be used to heat the specimen for this test method.
This specimen is then fastened between two clamps (one fixed and one movable) and immersed in the aqueous medium. The
aqueous medium is gradually heated until the specified temperature is reached without shrinkage or until shrinkage is indicated
by a deflection of the dial needle which is attached to the movable clamp.
5. Significance and Use
5.1 This test method is designed to determine the temperature at which a thoroughly wetted leather specimen experiences
shrinkage. In this test method, shrinkage occurs as a result of hydrothermal denaturation of the collagen protein molecules which
make up the fiber structure of the leather. The shrinkage temperature of leather is influenced by many different factors, most of
which appear to affect the number and nature of crosslinking interactions between adjacent polypeptide chains of the collagen
protein molecules. The value of the shrinkage temperature of leather is commonly used as an indicator of the type of tannage or
the degree of tannage, or both, of that particular leather (especially for the more hydrothermally stable tannages such as chrome
tannage).
6. Apparatus
6.1 Stand, for supporting the testing equipment.
6.2 Indicating Device, either of the two devices listed as follows:
1
This test method is under the jurisdiction of ASTM Committee D31 on Leather and is the direct responsibility of Subcommittee D31.07 on Physical Properties . This
test method was developed from Federal Test Method Standard No. 311, Method 7011.1, in cooperation with the U.S. Defense Personnel Support Center, Directorate of
Clothing and Textiles, Philadelphia, PA and the U.S. Army Natick Research, Development and Engineering Center, Natick, MA.
Current edition approved Oct.Sept. 1, 2003.2008. Published December 2003.October 2008. Originally approved in 1997. Last previous edition approved in 19972003 as
D6076-97.D 6076-03.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D 6076–08
6.2.1 Theis Shrinkage Meter Dial—a dial indicator having a face divided into 360 to 380°, with one revolution of the dial hand
3
corresponding to 12.7 mm (0.5 in.) of specimen movement, and with leeway for four revolutions of the dial hand.
6.2.2 AGD (American Gage Design) Dial Indicator— A mechanical device capable of registering on a scale a reading of the
shrinkage or swelling movement of the specimen in a ratio of at least 25 uni
...
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