TY - JOUR ID - TI - EFFECT OF EGG SHELLS POWDER ON SOMEMECHANICAL AND PHYSICAL PROPERTIES OFNATURAL RUBBER (NR) AU - Mohammed Razzaq Mohammed Ahmed Namah Hadi PY - 2012 VL - 12 IS - 3 SP - 440 EP - 458 JO - Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد SN - 20761819 AB - In this research, the effect of egg shells powder on some mechanical andphysical properties of natural rubber, that comprised each of tensile strength, modulusof elasticity, elongation, hardness, resilience and specific gravity, were studied. Theegg shells were collected and dried by exposed to sun for (3) days and they weremilled by electrical mill, the set of sieves were employed to get on egg shell powderby the suitable size. The egg shell powder was added to NR from 5 wt % to 25 wt %and then tensile, hardness, resilience and specific weight tests were carried out forprepared specimens. The results showed that the hardness and modulus of elasticity,specific weight increased with increasing of the powder. The hardness was (35 IRHD)for pure rubber, while was (49.3 IRHD) at percent of powder (25 wt %) . It wasobserved that the tensile strength, elongation and resilience decreased with increasingof powder. The tensile strength was (21.96 MPa) for pure rubber, while was (9.21MPa) at percent of powder 25 wt %. This work exists with a good replacement forsynthetics fillers avoiding their toxicity and their highly cost and reducing of theenvironmental pollution.

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