Modification of Tyre Rubber Crumb with Wastes of Plant Oil Production

Table 7

The test results of the obtained rubber mixture.

Indicators	Standard	Sample number
		Reference	1	2	3	4
Nominal strength (MPa) (kg(f)/cm^2)	At least 7,0 (71,4)	8,26	8,43	8,04	7,88	8,39
Relative elongation (%)	At least 250	287	297	283	280	300
Residual elongation (%)	No more than 20	11	9	14	13	10
Shore hardness (nominal units)	58-73	63	64	69	71	64
Nominal strength after thermal aging in air at a temperature of 90°C for 72 hours (MPa) (kg(f)/cm^2)		6,53	6,62	6,29	6,23	6,61
Change in nominal strength after thermal aging in air at a temperature of 90°C for 72 hours (%, not less)	Minus 25%	-20,9%	-21,5%	-21,8%	-20,9%	-21,2%
Elongation at break after thermal aging in air at 90°C for 72 hours (%)		227	233	223	220	237
Change in elongation at break after thermal aging in air at a temperature of 90°C for 72 hours (%, not less)	Minus 30%	-20,9%	-21,5%	-21,2%	-21,4%	-21,0%