In the present study, polymer composite reinforced with different ratios of glass fiber were
prepared to improve mechanical and thermal characteristics for wear applications. Five samples
with percentages (5%, 10%, 15%, 20%, 25%) of glass fiber of choppes range from (0.1 – 5
mm) length used as additives to a matrix of unsaturated polyester were tested. Mechanical tests
include: wear, impact, tensile and hardness, while thermal tests include: thermal conductivity.
The results show that the sample with 25% glass fiber indicates high wear resistance and
hardness, while 10% is the higher impact resistance and 5% is the higher tensile strength. Also
thermal conductivity decreases with increasing glass fiber percentage .To obtain optimum
polymer properties, suitable balance between mechanical and thermal properties must be
performed by controlling on additives ratios and shape which mentioned above, Therefore 15%
percentage glass fiber is indicate good agreement with purpose of this work.