This study was carried out to investigate the effect of adding mica (5, 10, 15, 20, 25
% vf) with variable particle size (35, 57, 70μm) on the mechanical and electrical
properties of the unsaturated polyester composites. Some mechanical tests were carried
out like (impact strength, flexural strength) and dielectric strength. Flexural strength
and dielectric strength were found to increase with filler concentrations whereas impact
strength was found to decrease at higher concentrations for all particle size.