The study of natural rubber compound Crumb rubber roof. By varying the size of Crumb rubber. And the volume of timber with Crumb rubber is used silica, 60 and 30 phr found a formula that 27 of NR 60 phr crumb 40 phr Silica 30 phr was formulated with the physical, the highest and most appropriate roofing rubber rubber. Crumb
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