Technically specified Block Rubber (TSR) as it is more popularly known, is scientifically processed form of natural Rubber, produced by adopting improved processing techniques.In India the processing of TSR was started in 1973 using indigenous machinery. Two plants were started at Palai in Kottayam District during this year. Now there are 35 crumb rubber-processing units in India. The crumb Rubber produced has to meet the specifications laid down by the bureau of Indian Standards from time to time. The various properties specified are dirt, volatile matter, Nitrogen content, ah content, initial plasticity and plasticity retention index and color. The different grades of crumb rubber produced and marketed in India areISNR 3L, ISNR 3CV, ISNR 5, ISNR 20 and ISNR 50. Of this, first three are processed from latex and the remaining three from field coagulum.The raw material we using for the production of crumb Rubber is Scrap rubber. The scrap rubber is a mixture of cup lump, tree lace and shell scrap.TSR is used for the manufacture of a wide range of rubber products .Automobile tyre & tube manufacturing Industry is the major Rubber consuming industry. The block rubber produced from scrap rubber normally consists of three different grades of ISNR.I SNR 10, ISNR 20 and ISNR 50.