CAD FEA Simulation to determine appropriate material

Hi, I have a component that needs pressure simulation to determine an appropriate material. We are currently using a grade of 30% Glass filled polypropylene, and we would like to move to Polythene. Firstly I need a simulation done on the material we are using (data sheet can be suppled), and secondly an appropriate widely available Polyethylene alternative either glass filled or otherwise is required, along with simulation.CAD simulation and experience with injection moulded components are a requirement.