Radial Variation in Specific Gravity of Eucalyptus tereticornis Sm. clones S.SriLakshmi 1 , R.V.Rao 2 1. Faculty, Dept. of Botany, Maharani Lakshmi Ammanni College for Women, Malleswaram, Bengaluru-12 2.Scientist G (Retd.), IWST, Bengaluru-12 Abstract Radial variation in Specific gravity of five clones of Eucalyptus tereticornis developed by Grasim industries, an unit of Harihar polyfibres were reported. The five clones represented by five trees each of four years old, were from two localities in Karnataka, namely Mandya (Irrigated-Locality I) and Kolar (Rainfed- Locality II). The results obtained in this study have shown the suitability of raw material for paper and pulp where the required specific gravity is met with. Mainly these clones are primarily tried to meet the requirements of paper and pulp industry. Key Words: Specific gravity, fibre and vessel morphology, clones, Paper and Pulp. Introduction Wood, like everything else, has a density - it is simply a ratio of mass/volume (kg/m3). Unlike other common materials, such as steel or concrete which have a narrow density range, a set volume of timber can vary greatly in its mass (and hence it's density) depending on the species. Even timber of the same species can vary in density depending on factors such as age, position in the tree, growing conditions, water availability etc. Commercially available timbers can range in density from < 300 kg/m3 to well over 1000 kg/m3 (at which point they no longer float in water). Density is a valuable indicator of a number of physical properties of wood and though there are exceptions to the rule an increase in density is usually indicative of an increase