DT materials

• Layout paper- sketching use

  medium opacity

  60 to 90 gsm

  high cost
• Tracing paper- copying

  off white

  low cost
• Grid paper- graphs or model making

  80 to 100 gsm

  average weight

  isometric or other patterns
• Cartridge paper- ink or watercolour used

  120 to 150 gsm

  textured

  medium cost

  thick
• Corrugated board-

  insulated

  degradeable

  cheap cost

  no bleech
• Solid White board- used for book covers or greeting cards or packaging.

  bleeched (to add print)
• Foamboard- lightweight, rigid, insulating properties, good for signage, displays, models, etc.
• Duplex board- 2 layers of paper with a coating of glue on one side. used for packaging with print on it.

  wax coating for food and drinks
• foil core board- card coated in aluminium. Is insulated and waterproof.
• ink jet board- used for printed photos and artwork

  bleedproof but it bleeched
• bleedproof paper- It is high quality and has color richness. 120 to 150 gsm.
• Hard woods- This is wood from a tree which looses its leaves. (deciduous)
• Soft woods- These woods do not loose their leaves in winter (coniferous)
• Hardwood:

  Ash - this is a shock absorber that is tough and often used in sports equipment.
• Hardwood:

  Beech - Wood has a pinky hue and is hardwearing. It also contains some natural antibacterial properties, making it useful for kids toys.
• Hardwood:

  Oak - This wood is very hard with a high quality finish.
• Hardwood:

  Balsa - Used for modelling and prototyping, this wood is easily broken, soft and polystyrene like.
• Softwoods:

  Pine - Used for interior construction and furniture. It is lightweight and cesinous (very knotted)
• Softwood:

  Larch - Durable, water resistant and often used for outside construction and furniture
• Softwood:

  Spruce - The only wood used for musical instruments but also used in furniture. Has a very high stiffness to weight ratio
• Manmade wood- recycled wood and chips glued and compressed together. cheap and comes in larger sizes.
• MDF (medium density fibreboard)

  smooth and good for painting
• Plywood

  more water resistant properties
• Hardwoods are more expensive than softwoods due to the fact that they grow slower and have less trees available
• chipboard

  sometimes covered in veneer
• Ferrous metals :

  Metals that contain iron.
• Non-ferrous metals :

  metals that do not contain iron
• Alloys :

  a mixture of two metals or more.
• Ferrous :

  will rust outside

  come in sheets, rods, tubes or angles

  often mixed with carbon/ other metals
• Non-ferrous :

  better for outdoors

  better conductor

  used for plating/coating

  often in alloys
• Alloys :

  eg. Brass (used for instruments)

  pewter (mainly tin with antimony and copper)
• Polymers (plastics) :

  natural plastic

  synthetic plastic
• natural plastic :

  plastics from the environment (eg. amber or tree resin)
• thermoforming plastic :

  can be reheated and reshaped an infinite amount of times. These plastics tend to start with poly- and are better for the environment because they can be recycled.
• Thermosetting plastics :

  These can be heated and shaped once but then will be heat resistant. These ones end in either -hyde or resin.
• 1. Polystyrene (PS): used for disposable cups, plates, packaging foam, insulation material, toys, CD cases etc. It is strong, rigid and hard. It is brittle at low temperature and easily scratched. It is flammable.
• Textiles can be split into two categories:

  natural fibres and synthetic fibres (oil based)
• Cotton :

  soft, absorbant, washes well and is strong.

  Used in towels and bed sheets
• Wool :

  absorbant, crease resistant but can shrink.

  Used in jumpers and carpets
• Silk :

  soft, natural shine due to it's triangular structure, lightweight

  Used in luxury clothes and wall hangings