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This lesson covers manufactured boards — sheet materials made by processing natural timber into particles, fibres or veneers and bonding them with adhesive. Manufactured boards are a key topic in AQA GCSE Design and Technology (8552), Section 3.1.6.
Manufactured boards are engineered sheet materials made from processed wood combined with adhesive (resin). They are designed to overcome the natural limitations of solid timber:
| Limitation of Solid Timber | How Manufactured Boards Solve It |
|---|---|
| Width limited by tree diameter | Manufactured boards are available in large, standard sheets (e.g. 2440 × 1220 mm) |
| Grain direction causes unequal strength | Many boards have no grain direction or alternating grain layers for equal strength |
| Warping and splitting | More dimensionally stable than solid timber |
| High cost of large hardwood sections | Manufactured boards use cheaper offcuts, sawdust and waste wood |
Plywood is made from thin layers of wood veneer (plies) glued together with the grain of each layer running at 90° to the adjacent layer.
| Property | Detail |
|---|---|
| Strength | Excellent strength in all directions due to cross-grained layers |
| Stability | Very resistant to warping, shrinking and twisting |
| Weight | Moderate — lighter than MDF |
| Surface | Can be rough (construction grade) or smooth (furniture grade) |
| Layers | Always an odd number of plies (3, 5, 7, etc.) to balance stresses |
| Thickness | Available from 3 mm to 25+ mm |
| Type | Description | Use |
|---|---|---|
| Interior plywood | Standard adhesive; not moisture-resistant | Furniture, shelving, drawer bases |
| Exterior / marine plywood | Waterproof adhesive (WBP — Weather and Boil Proof) | Boat hulls, outdoor structures, bathrooms |
| Birch plywood | High-quality Finnish/Baltic birch veneer | Furniture, toys, laser cutting, CNC routing |
| Structural plywood | Thick, strong sheets for construction | Flooring, roofing, formwork for concrete |
Uses: Furniture, shelving, boat building, construction, toys, laser-cut products, aircraft (historically).
AQA Exam Tip: The key fact about plywood is the alternating grain direction. This gives plywood roughly equal strength in all directions, unlike solid timber which is strong along the grain but weak across it. Always mention this cross-grained structure in your answer.
MDF is made from wood fibres (from softwood waste) bonded together with urea formaldehyde resin under heat and pressure.
| Property | Detail |
|---|---|
| Surface | Very smooth, uniform, no grain pattern |
| Density | Higher than most natural timbers; heavy |
| Machinability | Excellent — routes, drills, sands and paints beautifully |
| Consistency | No knots, no grain, uniform density throughout |
| Swelling | Absorbs water and swells permanently — not suitable for wet areas |
| Dust | Fine dust produced during cutting is hazardous (contains formaldehyde) |
Uses: Flat-pack furniture (IKEA-style), kitchen cabinet doors and carcasses, skirting boards, shelving, speaker cabinets, painted furniture, shop fittings.
MR MDF (green-coloured) has added moisture-resistant resin. It is suitable for bathrooms and kitchens but is still not waterproof.
Chipboard is made from wood chips and particles (from waste timber) bonded with resin and pressed into sheets.
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