Recycled plastic has a highly nonlinear stress-strain behavior
It has adequate stiffness and good strength for structural and nonstructural applications in the construction industry (it is a viable material)
Creep is a problem and applications involving large sustained load should be avoided
For more details refer to:MacBain, K., and M. Ala Saadeghvaziri, "Material Properties of Recycled Plastics and Analytical Modeling,” Journal of Materials Engineering and Performance,Vol. 8, No. 3, June, 1999.