ASTM D8042-18

Test Method for Shrinkage Temperature of Wet Blue and Wet White

SIGNIFICANCE AND USE
5.1 This test method is designed to determine the temperature at which the Wet Blue or Wet White 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 Wet Blue or Wet White. The shrinkage temperature of Wet Blue or Wet White 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 Wet Blue or Wet White is commonly used as an indicator of the type of tannage or the degree of tannage, or both, of that particular Wet Blue or Wet White (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 Wet Blue and Wet White. 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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2018
• ICS: 59.140.30 - Leather and furs
• Technical Committee: D31 - Leather
• Drafting Committee: D31.02 - Wet Blue

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D8042 − 18
Test Method for
1
Shrinkage Temperature of Wet Blue and Wet White
This standard is issued under the fixed designation D8042; 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 3.2 Definitions of Terms Specific to This Standard:
3.2.1 shrink, v—to contract or become smaller.
1.1 This test method covers the determination of the shrink-
3.2.2 shrinkage, n—the temperature at which noticeable
age temperature of all types of Wet Blue and Wet White. The
shrinkage occurs when a Wet Blue or Wet White specimen is
heating medium is water when the shrinkage temperature is at
gradually heated in an aqueous medium.
or below 98°C. The heating medium is a glycerine-water
solution when the shrinkage temperature is above 98°C.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as the
4.1 A Wet Blue or Wet White specimen is thoroughly
standard. The values in parentheses are for information only.
soaked in the aqueous medium that will be used to heat the
1.3 This standard does not purport to address all of the
specimen for this test method. This specimen is then fastened
safety concerns, if any, associated with its use. It is the
between two clamps (one fixed and one movable) and im-
responsibility of the user of this standard to establish appro-
mersed in the aqueous medium (see Fig. 1). The aqueous
priate safety, health, and environmental practices and deter-
medium is gradually heated until the specified temperature is
mine the applicability of regulatory limitations prior to use.
reached without shrinkage or until shrinkage is indicated by a
1.4 This international standard was developed in accor-
deflection of the dial needle which is attached to the movable
dance with internationally recognized principles on standard-
clamp.
ization established in the Decision on Principles for the
5. Significance and Use
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5.1 This test method is designed to determine the tempera-
Barriers to Trade (TBT) Committee.
ture at which the Wet Blue or Wet White specimen experiences
shrinkage. In this test method, shrinkage occurs as a result of
2. Referenced Documents
hydrothermal denaturation of the collagen protein molecules
2
2.1 ASTM Standards:
which make up the fiber structure of the Wet Blue or Wet
D1517 Terminology Relating to Leather
White. The shrinkage temperature of Wet Blue or Wet White is
D6076 Test Method for Shrinkage Temperature of Leather
influenced by many different factors, most of which appear to
affect the number and nature of crosslinking interactions
3. Terminology
between adjacent polypeptide chains of the collagen protein
3.1 Definitions—For definitions of general leather terms
molecules. The value of the shrinkage temperature of Wet Blue
used in this test method, refer to Terminology D1517.
or Wet White is commonly used as an indicator of the type of
tannage or the degree of tannage, or both, of that particular Wet
1
Blue or Wet White (especially for the more hydrothermally
This test method is under the jurisdiction of ASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
stable tannages such as chrome tannage).
Current edition approved Sept. 1, 2018. Published October 2018. Originally
approved in 2016. Last previous edition approved in 2016 as D8042-16. DOI:
6. Apparatus
10.1520/D8042-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6.1 Stand, for supporting the testing equipment.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.2 Indicating Device, either of the two devices listed as
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. follows:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D8042 − 18
indicator shall have a spindle capable of attachment to the
4
specimen and to the adjustable weight assembly.
6.3 Immersion Heater, 250 to 500 W, with a heating element
1
not longer than 140 mm (5 ⁄2 in.) and a depth of immersion not
in excess of 152 mm (6 in.).
6.4 Variable Speed Stirrer, with small blades.
6.5 Spring-loaded Clamps, (alligator type), two, mounted
vertically one above the other and sufficiently far apart for
gripping the full width of the specimen at the ends. The bottom
clamp shall be fastened to the end of a U-shaped rod that can
be turned sideways. T
...

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: D8042 − 16 D8042 − 18
Test Method for
1
Shrinkage Temperature of Wet Blue and Wet White
This standard is issued under the fixed designation D8042; 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 test method covers the determination of the shrinkage temperature of all types of Wet Blue and Wet White. 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 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1517 Terminology Relating to Leather
D6076 Test Method for Shrinkage Temperature of Leather
3. Terminology
3.1 Definitions—For definitions of general leather terms used in this test method, refer to Terminology D1517.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 shrink, v—to contract or become smaller.
3.2.2 shrinkage, n—the temperature at which noticeable shrinkage occurs when a Wet Blue or Wet White specimen is gradually
heated in an aqueous medium.
4. Summary of Test Method
4.1 A Wet Blue or Wet White 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. medium (see Fig. 1). 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 the Wet Blue or Wet White 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 Wet Blue or Wet White. The shrinkage temperature of Wet Blue or Wet White 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 Wet Blue or Wet White is
commonly used as an indicator of the type of tannage or the degree of tannage, or both, of that particular Wet Blue or Wet White
(especially for the more hydrothermally stable tannages such as chrome tannage).
1
This test method 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 June 1, 2016Sept. 1, 2018. Published June 2016October 2018. DOI: 10.1520/D8042-16.Originally approved in 2016. Last previous edition
approved in 2016 as D8042-16. DOI: 10.1520/D8042-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
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

---------------------- Page: 1 ----------------------
D8042 − 18
FIG. 1 Shrinkage Meter Apparatus (“Shrinkometer”)
6. Apparatus
6.1 Stand, for supporting the testing equipment.
6.2 Indicating Device, either of the two devices listed as follows:
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 leew
...