الفهرس 
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Abstract
In the rc\:en! years the usc uf polymer, blends especially rubber
blends, was willcly spread in diflhcnt fields of imlustly. The most
importa11t usability lor rubber blends depends on their physical properties
especially mechanical and electrical pmperlies. So our work in this thesis
was devoted to the experimental measurements of such properties for both
samples of Stpcue - Butadiene Rubber (SBR) aud its blend, with natural
rubl.Jcr (NR/SB!Z). These samples were loaded with Fast Extrusion
Furnace em lmn black (FEF) with different co1u.:enlrations (55, 75, 95 and
I 05 phr.). All test samples were prepared according to the same
proccdur and the same drcumslanccs, since sample properties depend on
the time of mixing and processmg. These were done according to
slandered methods.