In the ISO 17130 standard published by the International Standards Organization (ISO), a test method is defined to determine the dimensional change (shrinkage) of leathers caused by aging. This test method is valid for all leather materials.
This test method covers the determination of the dimensional stability of leather materials intended for use in panel and curtain systems against cyclic changes in humidity and temperature.
A test piece conditioned during testing is aged using conditions defined in the ISO 17228 standard. At least two test pieces measuring 150 × 150 mm are used for each of the required aging conditions. For some applications it is necessary to use larger test pieces, such as 300 × 300 mm, to improve accuracy, especially at low shrinkage. On the reverse parts, using an indelible marker or needle, mark four measurement reference points to form a square with sides of 100 plus/minus 1 mm.
The change of properties under the influence of alternative climatic conditions and especially under the influence of dry heat limits the usability of leather. This includes loss of space, loss of softness, stress development under isometric conditions, and degradation of molecular structure. It is known that there are great differences in the dimensional stability of chrome-tanned leathers and chrome-free leathers.
In the tests conducted, the observed strengths of chrome-tanned leather during climate change are measured, and thickness, mass, and flexural stiffness are analyzed before and after processing in climate change tests. The results show that the isometrically held strengths of the leather increase with increasing climate change cycles. Thickness and mass vary with the humidity of the applied climate, and stiffness increases with increasing cycle numbers, even at temperatures above 60 degrees. In addition , the tests determined that the heat sensitivity of the leather differs depending on the tanning type and the climate to which it is exposed. At the same temperature, non-chrome-tanned leather is more stable in dry conditions, while chrome-tanned leather shows higher stability (flexural stiffness) at high humidity.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides test services for determining the size change between physical and mechanical tests of leather materials, within the scope of ISO 17130 standard, with its trained and expert staff and advanced technological equipment.
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