With the addition of crumb rubber 60 mesh
sizes and (30, 40, 50) wt% can be found to increase the
tensile strength of the sample, it was due to the addition
of crumb rubber devulcanisation process will occur, in
which the cross linking that occurs in crumb rubber due
to sulfur will be interrupted during the process of
blending at hight temperatures. In order to obtain good
adhesion between the polypropylene and crumb rubber
that generate tensile strength increased by 197%
compared to the sample without filler. From the images
can be obtained that the smaller size of the fillers the
greater tensile strength. In accordance with [8] if the
particles of rubber are small enough and have well
vulcanisation, the nature of the mixture is usually
increased.