Changes in the mechanical properties of polymers: increase in tensile strength, increase in tensile stress, decrease in elongation at break, resistance to cracking
Thermal stability of materials, including those under pressure (for example, for HDPE, the maximum temperature of continuous loads is approximately 60 °C; after stitching, the operating temperature can reach 100−120 °C), an increase in the melting temperature by several times
Resistance to chemical compounds due to reduced solubility in organic solvents
Thermorelaxation, or "shape memory effect": macromolecules of a cross-linked polymer deformed near the melting point and fixed in this state by abrupt cooling, when reheated, return to an equilibrium state with the restoration of the size and shape of the material