Silicone rubbers have advantageous thermal and electrical properties compared with other elastomers. Their mechanical properties, such as tensile strength and tear resistance are relatively weak compared with other elastomers. In this work, inorganic fillers such as titanium dioxide (TiO 2 ) 2 and 5 phr, quartz, aluminium silicate and vulkasil (s type) 5, 15 and 25 phr were used in silicone rubber compound samples. Improvement in mechanical and processing properties are observed for these samples. The samples containing 2 phr TiO 2 had a better tensile strength and transparency compared with those containing 5 phr TiO 2 . Determination of tensile strength, elongation at break, modulus, tear resistance, resilience and compression set of aged and unaged samples showed that higher values are obtained for samples containing quartz.
For industrial applications of engineering polymers such as polyurethane, polyamides and polyesters, the addition of suitable reinforcing inorganic fillers is a practical and convenient method to achieve the desirable mechanical and chemical properties. In this study, the mechanical, chemical and morphological properties of cast polyurethane samples containing barium sulphate, calcium carbonate, kaolin and quartz fillers were investigated. In the formulation of these samples, the ranges of inorganic filler were 0-40 phr. The results of mechanical property tests, such as tear resistance, tensile strength, elongation at break, Young's modulus, hardness and abrasion resistance, were evaluated. The chemical resistance of the samples was determined against xylene and methyl ethyl ketone. The chemical resistance of the filled cast polyurethane was determined by the solubility parameters of polymer/solvent. Finally, the experimental results and SEM images showed that samples containing 30 phr calcium carbonate produced the best results.
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