Maths works fine thanks maddox.
Material labels probably got mixed up. Suppliers not always reliabke
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He means well Andy. Don't sweat it.
No worries fella. Lost in translation :)
Ve just been and checked out a certified piece of material.
The weight for a piece measuring 785×900x41 comes in at 28.4kg
Therefore the material is 1.1 g/cm3
Phewwww :)