Thixotropy is defined as 'the continuous reduction in viscosity with time when the material initially at rest, is subjected to a constant shear rate/ shear stress and the subsequent recovery of the viscosity to its initial value after the shear rate/shear stress is removed and sufficient rest time is given to the material'. This phenomenon is usually exhibited by colloidal suspensions, clay suspensions, cement pastes, paints, food products such as mayonnaise, and biological fluids such as blood. A popular material model incorporating thixotropy with other phenomena is the Thixotropic Elasto Viscoplastic (TEVP) fluid. TEVP fluids exhibit phenomena such as shear thinning, yield stress, viscoelasticity and thixotropy. A filled polymer melt system consisting of LDPE (low density polyethylene) filled with fumed silica is proposed as a material system that exhibits the different features expected from a general TEVP fluid. It is evaluated through different rheological protocols such as steady shear, step shear, start up shear and flow reversal. It is observed that the proposed formulation yields better viscoelastic transients at lower times and structural breakdown occurs on longer time scales. The rheological response of the existing model material systems in various steady and transient shear tests exhibits shear stresses with limited measurements of first normal stress differences. Due to the lack of sufficient rheological data on a material system that includes normal stress differences along with shear stress, the predictive capabilities of different three-dimensional models have not been assessed properly. The present formulation exhibits first normal stress differences at higher shear rates in steady shear that may be useful for quantifying the existing mathematical models and developing new mathematical models.