ASTM D7477-16(2021)

Standard Test Method for Determining the Area Stability of Wet Blue Submersed in Boiling Water

SIGNIFICANCE AND USE
4.1 Determination of the hydro-thermal area stability of Wet Blue provides information concerning the efficacy of the tanning process as well as the adequacy of the Wet Blue for intended end use applications where area stability is a particular requirement. Relative area stability of chrome-tanned leather is a requirement for many applications such as bookbinding, shoe and boot components, upholstery, seals and gaskets, etc.  
4.2 This test method is suitable for use in development work and process control in the tannery and for specification testing of Wet Blue for domestic and international commercial purposes.
SCOPE
1.1 This test method provides a standard procedure for determination of the dimensional stability or area shrinkage of a specimen of Wet Blue that is submersed in boiling water for a specified time period. This test method is applicable to all types of Wet Blue.  
1.2 The values given in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.  
1.3 This test method does not apply to Wet White.  
1.4 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.  
1.5 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: Published
• Publication Date: 31-Aug-2021
• ICS: 59.140.30 - Leather and furs
• Technical Committee: D31 - Leather
• Drafting Committee: D31.02 - Wet Blue

Standards Content (Sample)

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: D7477 − 16 (Reapproved 2021)
Standard Test Method for
Determining the Area Stability of Wet Blue Submersed in
1
Boiling Water
This standard is issued under the fixed designation D7477; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope or until it is completely re-hydrated (see 9.1 for details on
re-hydration). The specimen to be tested is cut out from this
1.1 This test method provides a standard procedure for
thoroughly hydrated sample cutting. The test specimen is then
determination of the dimensional stability or area shrinkage of
totally submerged and suspended in boiling water. The test
a specimen of Wet Blue that is submersed in boiling water for
specimen is removed 3.0 min after the water temperature
a specified time period. This test method is applicable to all
reaches 100 °C and begins to re-boil.As soon as the specimen
types of Wet Blue.
has cooled sufficiently to allow comfortable handling the area
1.2 The values given in SI units are to be regarded as the
loss is determined.
standard. The inch-pound units given in parentheses are for
information only.
4. Significance and Use
1.3 This test method does not apply to Wet White.
4.1 Determinationofthehydro-thermalareastabilityofWet
1.4 This standard does not purport to address all of the
Blue provides information concerning the efficacy of the
safety concerns, if any, associated with its use. It is the
tanning process as well as the adequacy of the Wet Blue for
responsibility of the user of this standard to establish appro-
intended end use applications where area stability is a particu-
priate safety, health, and environmental practices and deter-
lar requirement. Relative area stability of chrome-tanned
mine the applicability of regulatory limitations prior to use.
leather is a requirement for many applications such as
1.5 This international standard was developed in accor-
bookbinding, shoe and boot components, upholstery, seals and
dance with internationally recognized principles on standard-
gaskets, etc.
ization established in the Decision on Principles for the
4.2 Thistestmethodissuitableforuseindevelopmentwork
Development of International Standards, Guides and Recom-
and process control in the tannery and for specification testing
mendations issued by the World Trade Organization Technical
of Wet Blue for domestic and international commercial pur-
Barriers to Trade (TBT) Committee.
poses.
2. Referenced Documents
2 5. Apparatus
2.1 ASTM Standards:
D6659Practice for Sampling and Preparation of Wet Blue
5.1 Beaker, standard, IL capacity. Other suitable containers
and Wet White for Physical and Chemical Tests may be used so long as the dimensions are sufficiently large to
E691Practice for Conducting an Interlaboratory Study to
enable suspension of the completely immersed test specimen
Determine the Precision of a Test Method with no contact occurring with the sides and bottom of the
E177Practice for Use of the Terms Precision and Bias in container during the test. Particularly when non-standard test
ASTM Test Methods specimens are used, the size and shape requirements of the
container are dependent on the dimensions of the specimen to
3. Summary of Test Method
be tested.
3.1 AsamplecuttingofWetBlueiseithertakendirectlyout
5.2 Thermometer, with a minimum scale reading to +110
of the tanning drum or else is pre-soaked in water for 30 min
°C, graduated in 1 °C, and having a 0.5 °C tolerance.
1
5.3 Timer, with minimum 3 min capacity and 1.0 s resolu-
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
tion.
Current edition approved Sept. 1, 2021. Published October 2021. Originally
5.4 Metal die, to cut specimens. The die should be con-
approved in 2008. Last previous edition approved in 2016 as D7477- 16. DOI:
10.1520/D7477-16R21.
structed of highly corrosion resistant alloy metal and must be
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
maintained in a clean and sharp condition to minimize distor-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
tion of the Wet Blue sample that may occur during the
Standards volume information, refer to the standard’s Document Summary page on
theASTM website. specimen cutting operation. The recommended specimen is a
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