Abstract :
A suitable substitute for metal is a composite material. Composites are lighter than metals but
have high resistance to corrosion due to non-metallic composites. The manufacturing process is
relatively simple and inexpensive. A composite material is a material made up of at least two
types of materials which have different physical properties, namely as a filler or reinforcement
and a matrix as a binder. In this study, the test used coconut coir and the matrix used was a PP
plastic sheet which was tested using bending and SEM tests. The bending strength test of the coir
composite has the highest strength value, which is the fiber composition of 40%. While the
lowest composition is 10%, it can be concluded that the greater the presentation of the volume
fraction of coconut fibers, the higher the flexural strength values will be due to the increasing
number of binders of matrix between fibers. Meanwhile, the flexural strength of pure
polypropylene without its own mixture was evaluated at 40 MPa. From the above results, it can
be concluded that the mixture of polypropylene and coir composite materials has a higher value
than pure polyropylene, so it can be said that the mixture of polypropylene and coir can improve
the flexural strength properties of pure polypropylene.