This process can be performed to reduce the shrinkage of singles and plied yarns made from PES-B types not subjected to fixing. According to the dying process to be used – HT dyeing, mostly at a water temperature of 125 °C or carrier dyeing, usually at boiling temperature – the shrinkage capacity of the yarn should be set at wider 4 % for the treatment.

Temperature constancy is especially important in stabilizing, as in all treatment processes at temperatures above 80 °C. Care should also be taken to ensure thorough evacuation to extract air from the material between the individual operating phases of the stabilizing process (Table 29).

Table 29 – Recommended stabilization guidelines