Table 4 Parameters of leather tanned using of chromium recovered from waste in the form of a concentrate separated from the alkaline hydrolysate.

Thickness [mm]

1.27

1.27

Tensile strength [N/mm²]

22.64

21.86

Elongation [%]

50

47

Tearing force [N]

92.83

91.38

Burst height (Lastometr)

9.9

9.5

Adhesion of the finish [N/cm]

4.2

5.4

Chromium(III) content converted to Cr₂O₃ [%]

4.33

4.18

Moisture content [%]

12.2

11.7