Dragonscale has different properties depending on the age and race of the dragon. It becomes less flexible and more tough as the dragon ages.
It is capable of withstanding heavier impacts than the same thickness of steel, and is also very good at absorbing shock. It shows comparable scratch resistance to diamond but can flex slightly.
Most famous are its fireproof properties. It does not conduct heat at all, and does not burn. However, it can re-emit absorbed heat from the side it was absorbed on extremely rapidly.