Poly(vinyl chloride) was plasticized with Bu(2) phthalate and dild. with Me(2)C(6)H(4), BuOAc, BuOH, cyxlohexanone and their mixts. to study the storage stability of the plastisols for 42 days at room temp. The viscosity of the plastisols was detd. at 20-40 degrees C and shear stress 40 mPa and used for calcg. the plasticity coeffs. and activation energy of viscous flow. The viscosity, plasticity coeff. and activation energy data were correlated by a polynomial equations as a functions of the storage time. The highest storage stability of the plastisols was achieved when they were dild. with Me(2)C(6)H(4), BuOAc or the BuOH-cyclohexanone mixts.