Sheet Material 
Hardboard
Hardboard
| Hardboard | |
 |
Sources: -Hardboards are a cheaper option than plywood where strength
is not required. Hardboard is made from wood fibre is extracted from chips
and pulped wood waste. In the production process the pulp is exploded
under pressure. Heat and steam is applies to leave a fine, fluffy brown
fibres. These fibres are transformed into mats, which are held together
with lignum and other glues. The mats are than pressed between steam-heated
metal plates to give grainless sheets with one smooth, glossy surface
and one textured surface. To prevent warping, moisture is added in a humidification
chamber.
Disadvantages: -Hardboard cannot be used outside because it absorbs water. Advantages: -There are three basic types of hardboard are available - standard, medium and oil-tempered. Oil tempered boards are impregnated with oil making them stiffer, harder and more resistant to scratches and moisture. A number of specially hardboards are available for specific purposes. These have either embossed, perforated, plastic-faced or veneer surfaces. |
