Design Technology - Topic 4.2b

Softwood

Wood from a coniferous tree. Decreased density, water resistance, and tensile/compressive strength. Increased flexibility and renewable

Hardwood

Wood from a deciduous tree. Increased density, water resistance, hardness, tensile/compressive strength, and better aesthetic properties. Decreased flexibility and non-renewable.

Engineered Timber

Made by gluing waste materials together to create a new material. Ensures that particular characteristics can be designed into the final product

Plywood

Layers of veneer are laid and glued down at 90 degrees to each other. Increased tensile/compressive strength, elasticity, and density.

Medium Density Fiberboard (MDF)

Small fibers are pressed into a form using binders. Increased weight, strength, and density. Decreased water resistance.

Fiberboard

Chips of wood are glued together to make panels. Lightweight, but decreased compressive/tensile strength

Seasoning

The drying out of wood so that it has useful mechanical and physical properties

Treatment of Timber

Protections applied to timber to improve its performance. Most commonly the degradation due to moisture or attack by fungus/insects

Finishing of Timber

Substances applied to timber to alter its aesthetic qualities and provide protection from environmental factors. For example, stains, oils, and waxes.