Here in the US one of the trade names is Celotex. Most so-called "acoustic tiles" are similar material. You can break off chunks of it with just your fingers if it's the right stuff.
You would normally wrap it in fiberglas batts (not boards) but only if it will be contained behind cloth of some kind (they usually are, since they're used inside a bass trap for more absorption) - otherwise, there's the danger of airborne fibers, a very real health hazard... Steve