1.1.23 Natural & Manufactured Timbers
D&T 2026 — 1.1(c) Product Design Pathway
Telling hardwoods and softwoods apart
The names are misleading: “hardwood” and “softwood” describe the type of tree, not how hard the timber is. Balsa is a hardwood but is one of the softest timbers there is, while some softwoods such as yew are very hard.
Hardwood — timber from deciduous (broad-leaved) trees, which usually lose their leaves in autumn. They grow slowly, so hardwoods are generally more expensive.
Softwood — timber from coniferous trees, which have needles and cones and are usually evergreen. They grow quickly and straight, so softwoods are cheaper and more readily available.
| Hardwoods | Softwoods | |
|---|---|---|
| Tree type | Deciduous, broad leaves | Coniferous, needles and cones |
| Growth | Slow — often 60–100+ years before felling | Fast — often 25–30 years |
| Cost | Generally more expensive | Generally cheaper |
| Grain | Often close and decorative | Often wider, with visible knots |
| Sustainability | Slower to replace; tropical hardwoods raise deforestation concerns | Easier to replant and manage in sustainable forests |
| Examples | Beech, balsa, oak, mahogany | Scots pine, Parana pine, spruce, cedar |
How to tell them apart in practice: look at the leaves or needles of the tree if you can. On a cut piece, softwoods usually have pale, resinous wood with clear annual rings and knots, while hardwoods often have a finer, more even grain. Weight and hardness are not reliable tests.
Natural wood compared with man-made boards
Manufactured board — a man-made sheet material made from layers, particles or fibres of wood bonded together with adhesive under heat and pressure.
| Natural timber | Manufactured boards | |
|---|---|---|
| Size | Limited by the width of the tree | Large, flat sheets (typically 2440 × 1220 mm) |
| Stability | Can warp, twist, shrink and split as moisture changes | Very stable — little or no movement |
| Grain | Attractive natural grain, but weaker across the grain | No grain direction (MDF) or crossed grain (plywood), so strength is even |
| Defects | Knots, splits and shakes | Uniform and consistent, with no natural defects |
| Appearance | Valued for its natural beauty | Plain; often veneered, laminated or painted |
| Cost | Higher, especially hardwoods | Lower; makes use of waste and low-grade timber |
| Sustainability | Renewable if sourced from managed forests (e.g. FSC) | Uses offcuts and recycled wood, but the adhesives can contain formaldehyde |
Natural timber must be seasoned — dried in the air or in a kiln — before use. Reducing the moisture content stops it shrinking, warping and splitting later.
Aesthetic and functional properties of beech, balsa, Scots pine and Parana pine
| Timber | Type | Aesthetic properties | Functional properties | Typical uses |
|---|---|---|---|---|
| Beech | Hardwood | Pale cream to pinkish-brown; fine, close, straight grain; smooth finish | Hard, very tough and strong; resists wear; good for turning and steam bending; not durable outdoors | Children’s toys, chairs and furniture, kitchen utensils, workbenches, tool handles |
| Balsa | Hardwood | Very pale, almost white; open, even texture | Extremely light and soft; very easy to cut with a craft knife; low strength | Model making, prototypes, model aircraft, floats and buoyancy aids |
| Scots pine | Softwood | Pale cream-yellow with reddish-brown annual rings; often knotty | Fairly strong and light; easy to work; cheap and widely available; knots can weaken it and resin can seep | Construction timber, roof joists, budget furniture, shelving, DIY |
| Parana pine | Softwood | Pale with attractive red or brown streaks; straight grain and few knots | Hard and strong for a softwood; smooth finish; can warp if not well seasoned; more expensive than Scots pine | Interior joinery, staircases, built-in furniture, window frames |
Balsa is a favourite exam trap. It is a hardwood because of the tree it comes from, even though it is the softest and lightest timber on this list.
Properties, strengths and weaknesses of plywood and MDF
Plywood
Plywood is made from thin layers of wood called veneers (or plies), glued together with the grain of each layer at 90° to the one before. There is always an odd number of layers, so the grain on both outer faces runs the same way and the board stays balanced.
| Strengths | Weaknesses |
|---|---|
| Strong in all directions because of the crossed grain | Edges show the layers and need covering or finishing |
| Very stable — resists warping and splitting | The face veneer is thin and can be sanded through |
| Available in exterior and marine grades that resist water | Better grades are expensive |
| Can be bent into curves (flexible plywood) | Can splinter when cut |
Uses: furniture, shelving, drawer bottoms, boat building, flooring, laser-cut products.
MDF (medium density fibreboard)
MDF is made from fine wood fibres mixed with resin adhesive and pressed into sheets under heat and pressure.
| Strengths | Weaknesses |
|---|---|
| Smooth, flat surface on both sides — ideal for painting and veneering | Absorbs water and swells badly unless sealed |
| No grain, so it cuts and shapes evenly in any direction | Heavy for its size |
| Cheap and stable | Edges are porous and hard to finish without sealing |
| Machines and laser cuts cleanly with crisp edges | Screws hold poorly in the edges |
| Fine dust when cut is a health hazard — use extraction and a mask |
Uses: flat-pack furniture, cabinets and kitchen units, display boards, moulds and formers, laser-cut parts.
Physical and working properties of timber
| Property | Meaning | Example |
|---|---|---|
| Toughness | The ability to absorb impact without breaking | Beech is tough, so it is used for mallets and children’s toys |
| Flexibility | The ability to bend without breaking and return to shape | Thin plywood and some steamed hardwoods bend into curves |
| Strength | The ability to withstand a force without breaking — timber is strongest along the grain | Scots pine joists carry floor loads |
| Absorbency | How readily a material soaks up moisture | MDF is very absorbent; marine plywood resists water |
| Surface finish | How smooth a surface can be made, and how well it takes a finish | Beech and Parana pine finish smoothly; MDF takes paint well once sealed |
| Colour | The natural colour and figure of the timber | Pale beech suits a Scandinavian look; Parana pine has decorative streaks |
Working properties — how easily a material can be cut, shaped, joined and finished using tools and machines.