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Fire retardant materials made of unsaturated polyester resin containing different halides and antimony trioxide were studied. In the present work the addition of a substance rich in halogen such as polyvinylchloride (PVC) and antimony trioxide Sb₂O₃ to the composite made of unsaturated polyester and fiberglass as a reinforced material has been studied. The addition of fire retardant material (PVC) and (Sb₂O₃) enhanced the fire retardancy of the product with remarkable low effect on the mechanical properties of the products. The electrical properties of the products are studied.

Oligomer (semicarbaside‐phethalic acid) and its complexes with Fe(III), Co(II) and UO₂(II) chloride were prepared and characterised using elemental analysis, spectral (¹H NMR, infrared and UV‐Vis) and magnetic measurements. Extensive studies suggested that the Fe(III), Co(II), and UO₂(II) oligomer complexes were octahedral dimers. Thermal analyses (thermal gravitational analysis (TGA) and differential thermal analysis (DTA)) of the complexes were carried out and the relevant activation energies were calculated. The effect of the oligomer on the corrosion of iron metal in acidic media (2 M H₂SO₄) was studied. It was found that the oligomer inhibited the corrosion of iron metal in acid media. The corrosion inhibition efficiency of these compounds was calculated based on weight loss and potentiostatic measurements.