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Recently, natural fibers attract the scientific community towards it usage as reinforcement in polymeric composites mainly because of environmental awareness, growing concern and multiple benefits like low cost, huge/easy availability, easy processing. Reinforcing natural fibers is an efficient approach towards reducing the consumption of non-biodegradable plastic material. Though, the major drawbacks of such composites are poor compatibility between the two distinct phases and high rate of water absorption. It has been observed that with this drawback, degradation of different mechanical and thermal properties generally occurs. Keeping this in mind, in present work, the surface of the sisal fibers are modified with aqueous solution of NaOH at different concentration prior to reinforce it in epoxy matrix. Later, water absorption rate of the developed material is evaluated over a period of one week where measurement is taken after every 24 hours. Results obtained indicate that with surface modified sisal fiber, water absorption rate decreases appreciably. Further, it is also determined that rate of water absorption is minimum with 2 Mole NaOH concentrations. Also, the density is measured and evaluated theoretically to know the void content in the fabricated samples [ABSTRACT FROM AUTHOR]