It is made out of exploded wood fibres that have been highly compressed. It is similar to particle board and medium-density fibreboard, but is denser and much stronger and harder.It differs from particle board in that the bonding of the wood fibres requires no additional materials, although resin is often added. The hardboard variety is made without resin. The HDF version is made with resin. Unlike particle board, it will not split or crack.

It is made out of exploded wood fibres that have been highly compressed. It is similar to particle board and medium-density fibreboard, but is denser and much stronger and harder.It differs from particle board in that the bonding of the wood fibres requires no additional materials, although resin is often added. The hardboard variety is made without resin. The HDF version is made with resin. Unlike particle board, it will not split or crack.