Science and Education Publishing Journal of Materials Physics and Chemistry 1 1 2013 07 06 Effect of Shells Powder Filler Additives on Hardness and Tensile Strength Properties of Natural Rubber 35 36 EN Ali I. Al-Mosawi Technical Institute, Babylon, Iraq JMPC2013132 10.12691/jmpc-1-3-2 2013 05 03 2013 07 05 2013 07 06 Shells powder filler was added to natural rubber grade SMR L. The filler loading was varied from 60 ¨C90 pphr. The mechanical properties included hardness and tensile strength were investigated. The results shown increased hardness continuously with shells powder filler loading from shells powder 60 ¨C90 pphr, but tensile strength decreased after adding shells powder filler.