Urea formaldehyde adhesives are widely used in wood composite industries to make wood based panel products, However to achieve better bonding strength and low VOC emission panel products the modification of resin further required. The objective of the study was to manufacturing of modified urea formaldehyde resin with polymeric isocyanate (pMDI) for manufacturing of better water resistant wood composite and resin properties study for manufacturing of wood composite products. In order to improve the water resistance properties, urea –formaldehyde resin are commonly modified with melamine or phenol. In this study water resistance properties of urea formaldehyde resin was enhanced by using Yamandur R-11(polymeric isocyanate (PMDI) having terminal isocyanate –CNO group appx. 12,5 %) with urea –formaldehyde resin . A typical composite adhesive was manufactured by mixing emulsifiable polymeric isocyanate with urea formaldehyde resin at a different concentration starting from 1%, 2.5%, 5.0%, 7.5% and 10% on the basis of liquid Urea Formaldehyde resin. Adhesive properties of UF /pMDI hybrid resin like viscosity, gel time ,FTIR spectroscopy, free formaldehyde of the resin and other resin property like formaldehyde emission of the board were analyzed. The results showed that the hybrid adhesive consisting of UF resin and emulsifiable polymeric isocyanate has shown better adhesive properties than the conventional Urea formaldehyde resin for manufacturing of wood composite products and reduces formaldehyde emission to maintain better indoor airquality for safer environment