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.
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.
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