greetings!

I want to design a chair with recycled plastics. My design will incorporate two types of plastic atleast. A mesh for the back, and a rigid structure for the frame/seat.

I notice that plastic lumber is cheap and widely available – but it is so heavy! what alternative recycled plastics are best? ideally it will be cheap, durable, available in black, strong (enough to hold a person without being too thick).

as for the mesh, I’m not sure something of my requirements exists. I want a material like that of the nylon backrest commonly used in office chairs. it needs to be recycled to meet my ethics.

any pointers the community can provide would be a huge help – thankyou!