Table 1 : Properties of radial tread containing different parts per hundred rubber (phr) either reclaimed (RR) or crumb (CR).

Phr of reclaimed rubber (RR) or
crumb rubber (CR)
Tension property test Abrasion
%
Rebound
%
Specific gravity
g/ml
Hardness (SI unit) Oscillating disk cure meter test Mooney
scorch
(m.m)
300% Modulus (MPa*) Tensile
(MPa*)
Elongation % L min (dN.m)§ Tsc
(m.m)#
L max (dN.m) CR¤
(m.m)
zero 14.6 17.8 382 100 100 1.160 72.5 11.2 2.1 55.5 3.78 44.91
5 RR 14.2 17.0 371 102 99.8 1.155 71.5 12 2.2 53.7 3.88 42.53
10 RR 13.5 16.3 366 98.8 99.0 1.155 71.5 12.3 2.22 52.7 3.90 42.02
15 RR 12.6 15.7 361 96.1 99.0 1.150 71.0 12.8 2.25 52.0 3.93 40.31
20 RR 11.7 14.7 357 91.5 97.0 1.150 71.0 13.3 2.3 51.0 3.98 39.16
5 CR 13.5 16.0 369 100.8 99.8 1.155 72.0 12.7 2.15 53.0 3.90 41.52
10 CR 12.6 15.4 362 97.7 98.8 1.155 72.0 13.2 2.2 52.0 3.93 40.98
15 CR 12.2 14.3 355 94.1 98.8 1.150 71.5 13.5 2.23 50.7 3.98 38.46
20 CR 11.6 13.8 351 89.6 98.2 1.150 69.0 13.8 2.28 48.8 4.05 36.92
specifications Not<12 Not<15 Not<360 Not<70 Not<70 1.148-1.178 69-75 9-15 1.6-2.4 50-60 3.35-4.20 Not<30

*MPa Mega Pascal (pressure measurement unit)
§Minimum torque in deci-neuton per meter 
#Scorch Time in minute per minute
¤Cure Rate

Hussein et al.Journal of Environmental Engineering and Ecological Science  2014 3:5DOI : 10.7243/2050-1323-3-5