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I know the answer is carbon fibre
I think the answer is probably Aluminium. Your 2040×1000 sheet in 2mm 5-bar treadplate would be just over £150 delivered and 11kg
The advantage over plastic is high elastic modulus and high strength, so you can use a much thinner sheet.
gbj_tester
@Emyr
I know the answer is carbon fibre, but I don't thing anyone sells sheets this big at a reasonable price.