What board is this? too fragile?

the manufacturer is Zetech - from what I could figure, they were australian and no longer in production - says Armacore Epoxy Constructions,, but doesn't feel like a normal epoxy board.
It's a 7.2, and given the other measures, about 75 L volume.
First of all, the weight, it's about 6Kg - insn't it too heavy?
The top is soft but not foam, but it seems like it has foam underneath the top layer. The board dings very, very easily, last week I noticed a small crack on the bottom near the rail - I have no idea were it came from, and now is soaking water... This is not like other epoxy boards I had in the past (I had a NSP and that thing must have hit everything from the shelf to the car, from the car to the beach, major scratches in it, never got soaked. Hard as a rock)
I posted some pictures.
I payed 250euros for this when I was a begginer, and I admit not knowing what I was doing. I was adviced by a nice guy that owns a second hand shop but I suspect he was just trying to sell it.
What can you say about this board?
Thanks!
Andi