Different direct molded ultra-high-molecular-weight polyethylene (UHMWPE) samples have been investigated using reflective light microscopy and scanning electron microscope techniques (low voltage and variable pressure SEM). On the surfaces as well as throughout the material a-to the best of our knowledge-unknown type of impurities has been identified. X-ray element analysis (EDX) was used to characterise these impurities as sodium chloride and potassium chloride salt inclusions.