... epoxidation can be achieved at any level, however only two grades are available commercially. These grades are marketed as Ekoprena 25 and Ekoprena 50 by Malaysian Rubber Board for ENR 25 and ... Material and Method 2.2 Preparation of ENR/ NR Compounds Raw rubbers ENR 50 and SMR 20 are obtained from Malaysian Rubber Board. All the vulcanisates are prepared according to standard ... of Carbon Black Loaded Rubber, J. Appl. Polym. Sci., (1965), Vol.9, 1073-1082. 7. Uday Karmarkar, Ana Barbur, Edward R. Terrill, Mark Centea, Larry R. Evans, James D. MacIsaac Jr., Tire Aging...