With the development of synthetic rubbers, a complex balance of technical properties and cost, emerged as the decisive factor in the selection of usage of rubber. To meet this challenge, different special forms of natural rubber have been evolved to make it suitable for certain specific applications. Some of them are Oil Extended Natural Rubber (OENR), Thermoplastic Natural Rubber (TPNR), De Proteinised Natural Rubber (DPNR), Superior Processing Rubbers, Graft Co-polymer Rubbers etc.