Plastic lumber having sufficient stiffness and strength to allow its use in structural and load-bearing applications. The plastic lumber is composed of a thermoplastic polymer, a thermosetting polymer cured with reinforcing fibers and, preferably, a coupling agent and foaming or blowing agent. As a preferred embodiment, the thermosetting polymer and reinforcing fibers are sourced from recycled materials, specifically, sheet molding compounds and bulk molding compounds.
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