. 2021 Jun 4;14(11):3069. doi: 10.3390/ma14113069

Table 5.

Physical-mechanical properties of CDET/NMM and chrome tanned leather.

Test	CDET/NMM ^(a)	Chrome ^(b)
Tensile strength (N/mm²) ^(c,d)	20.0 ± 0.5	25.0 ± 0.8
Tear strength (N/mm) ^(c,e)	36.5 ± 0.3	40.0 ± 0.5
Elongation (%) ^(c,d)	44.5 ± 1.0	46.0 ± 0.8
Resistance to grain cracking (N/mm²) ^(c,f)	9.3 ± 0.2	10.0 ± 0.1

^(a) Crust leather samples prepared by tanning with 3.1/1.9 wt/wt CDET/NMM by weight of the hide processed and retanning with synthetic tannins (see experimental section). ^(b) Crust leather samples prepared by tanning with 5 %wt basic chromium sulfate and retanning with synthetic tannins. ^(c) Average of mean and cross backbone samples. ^(d) Measured according to EN ISO 3376 (IULTCS/IUP 6, 2011). ^(e) Measured according to EN ISO 3377-1 (IULTCS/IUP 40, 2011). ^(f) Measured according to EN ISO 3378 (IULTCS/IUP 12, 2002).