I've looked at that sort of stuff Maxamuslead. They don't actually give me anything of real value in the descriptions, such as real world strength compared to X, weight, etc.
Flat surface, concrete pavement to be specific.
I assumed acrylic as it was dirt cheap, £5 for a 1000/500(mm) @ 5mm thickness rectangle, which seems an impossible price for polycarbonate. Unless the person I bought it from was just as clueless over it, possible considering it was from a secondhand and overstock fair, the item wasn't labelled as any specific plastic, just a price on the tag.
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