Standard Test Method for Determining the Area Stability of Wet Blue Submersed in Boiling Water
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.
ASTM D7477-16(2021) - Standard Test Method for Determining the Area Stability of Wet Blue Submersed in Boiling Water provides a consistent procedure for measuring the dimensional stability or area shrinkage of Wet Blue leather when subjected to boiling water. Developed by ASTM Committee D31 on Leather, this standard evaluates the hydro-thermal area stability of chrome-tanned leather, commonly referred to as Wet Blue, which is an essential parameter for the quality control and specification of leather used in high-performance applications.
Testing the area change of Wet Blue is critical to understanding the effectiveness of the tanning process and the suitability of leather for end-use products where dimensional stability is a crucial requirement. This document is aligned with internationally recognized principles of standardization and supports both domestic and international commercial requirements in the leather industry.
Dimensional Stability and Shrinkage: The method quantifies area loss or change when Wet Blue samples are submerged in boiling water, simulating exposure to severe hydro-thermal conditions.
Testing Procedure:
Applicability:
Process Control and Specification Testing: ASTM D7477 is applicable in tannery development, process optimization, and verification against customer or regulatory requirements.
Safety and Compliance: Users are responsible for implementing proper safety, health, and environmental practices while following this standard.
The ASTM D7477-16(2021) standard is widely utilized in several practical scenarios vital to the leather sector:
Другие стандарты ASTM
Quality Control in Tanneries: Producers use the method during manufacturing to monitor the consistency and quality of Chrome-tanned Wet Blue leather, ensuring it meets customer requirements.
Product Development: Designers and engineers reference the test results to select or improve leather for product lines where heat and moisture exposure may affect the final item.
Specification and Certification: Leather supplied for use in:
International Trade: The standard ensures consistent testing criteria across different countries, supporting efficient global commerce in Wet Blue leather products.
For comprehensive quality management in leather production and testing, ASTM D7477-16(2021) is often used in conjunction with related ASTM standards, including:
These documents collectively support accuracy, consistency, and repeatability in leather testing processes.
Keywords: ASTM D7477, Wet Blue, chrome-tanned leather, area stability, dimensional stability, boiling water test, leather testing standard, tannery process control, leather quality, area shrinkage, international leather trade