If this is anything like previous recycled samples I've seen, it'll have the structural integrity of a wet noodle, so you need to have a good structure to support it, which is why I'm guessing that bench has as many thick legs.

I remember a mate got some recycled plastic samples from a company, and he showed me one sample that must have been about 2"x5" and 3 foot long, which was being targeted for replacing wood. You could noticeable bend it by hand, and we couldn't come up with any practical application you could actually use it for. It was structurally useless, and too heavy.