DT Exam

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Cedar Properties
ADV: Natural Oils make wood resistant to water and fungal growth/ DIS: Expensive, Not as strong as pine/ USES: Fences, Sheds, Boats
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Cast Iron Properties
Hard skin, Brittle, Soft Core, Good in compression, Self Lubricating, Magnetic/ Iron+2-6% Carbon/MP:1200°C/ USES: Machine parts, Vices, Brake Discs
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Polyester Properties
Thermosetting Polymer/FORM: Thick liquid/ Rigid,Brittle, Insulator, Good Chemical Resistance/ USES: Boat Hulls, Sports Car Bodies,Catalyst for hardening resin, Used with Glass Fibre, Decorative Objects
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Polyester Properties 2
ADV: Lightweight and Strong, Can be polished/ DIS: Can chip if dropped
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White Board Packaging
Strong, Rigid Board made from bleached pulp, Excellent for Printing/ USES: Book covers, Packaging/ ADV: Strong, Rigid, Accepts Paint well/ DIS: Can be Expensive
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Calico Properties
Simple Cotton cloth, The warp and weft pass over each other and under, Naturally Grey, Soft or Coarse/ USES: Shirts, Bags, Bedding/ ADV: Strong, Hangs well, Cheap/ DIS: Firm Varied Quality
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Acrylic (PolyMethylMethAcrylate)
Thermoforming Polymer/ Sheets, Rods, Tubes/ Tough, Easily Scratched, Easily finished and cleaned, Food Safe/ USES:Shop Signs, Fish tanks, Car Lights/ ADV: Available, Can be shaped with heat/ DIS: Breaks easily if dropped
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Stainless Steel Properties
Corrosion Resistant, Hard, Tough, Magnetic, Resists wear/ Alloy: Carbon Steel+10.5-18% Chromium+8% Nickel+ 8% Maganese/ 1400°C/ USES: Kitchenware, Medical Equipment
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Carbon Footprint
The total greenhouse gas emissions caused by an individual, event, organization, or product, expressed as carbon dioxide equivalent.
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Aluminium Properties
Greyish White, Corrosion Resistant, maleable,ductile, conductor, polishes well, good strength to weight ratio/ 660°C/ USES: Aircraft, Drink Cans, Engine Parts
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Steel Sustainability
Steel is the only sustainable metal; it is used not consumed. The properties are not lost and the minerals and fuels are kept the same. However recycling metals has to be done manually and takes energy.
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Brazing- Permanently joins metal using an alloy with a lower melting point.
1.The steel is cleaned with oxides/ 2. Flux(Borax) is put on joint to prevent oxidation and allow metal to flow/ 3. Metal held in place/ 4. Joint heated to 875°C/ 5. Filler rod melted and allowed to flow around metal.
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Painting- Creates a coloured barrier, may add extra properties like heat resistance
Applied through brush roller or spray/ ADV: Quick, Easy and Cheap/ DIS:Needs regular maintenance
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Dip Coating- Provides thick layer of plastic
APPLIED: Metal is heated above point of plastic 230°C and dipped into plastic mixed with air/ ADV: Little waste, Even coating/ DIS:Equipment expensive and not suitable for delicate work
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Electroplating- covers metal with less reactive ones
1. Electromechanical processes allow ions to attach to base metals/ 2. Metal suspended in solution of metallic salts (negatively charge) and metal to be deposited is at the positive electrode. ADV: Corrosion resistant/ DIS: Expensive, harmful
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Anodising-improves the natural oxide of metals (Aluminium)
2. Metal placed in sulphuric acid water and sodium sulphate solution/2. Metal is the positive ectrode, lead plates are negative electrodes/ 3. Electric current builds up tough oxide layer then fixed in boiling water/ ADV: Durable/ DIS: little colours
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Powder Coating- Thick, even protective paint layer (fridges)
1. Powder is positively charged and metal is negatively charged/ 2. Powder sticks to metal and is melted to form an even finish/ ADV: Little waste, even coating/ DIS: Expensive, difficult to get even layer
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Galvanising- A zinc protective layer
1. Metal dipped in motlten zinc (450-460°C)/ 2. Thin layer solidifies on surface of metal/ ADV: Durable, low maintenance/ DIS: Expensive
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Lacquering- clear cellulose or varnish preventing corrosion (jewellery)
1. Brushed, rolled or sprayed on/ ADV: Keeps original colour/ DIS: May not be durable, requires several quotes
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Brass
Yellow, harder than copper, conductor, corrosion resistant/ Alloy: 65% Copper+35% Zinc/ MP: 900-940°C/ USES: Instruments, door knobs
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Environmental impact of steel
Steel Plants release CO2/ Use of fossil energy/ Sulphur dioxide from combustion of oil/ Use of water; uses up clean water
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Trend Forcasting
Trend forecasts are able to predict the future patterns and colours two years before products come onto the market, and manufacturers can buy this information to influence their designs and enable them to keep ahead of their market competitors.
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Other cards in this set

Card 2

Front

Hard skin, Brittle, Soft Core, Good in compression, Self Lubricating, Magnetic/ Iron+2-6% Carbon/MP:1200°C/ USES: Machine parts, Vices, Brake Discs

Back

Cast Iron Properties

Card 3

Front

Thermosetting Polymer/FORM: Thick liquid/ Rigid,Brittle, Insulator, Good Chemical Resistance/ USES: Boat Hulls, Sports Car Bodies,Catalyst for hardening resin, Used with Glass Fibre, Decorative Objects

Back

Preview of the back of card 3

Card 4

Front

ADV: Lightweight and Strong, Can be polished/ DIS: Can chip if dropped

Back

Preview of the back of card 4

Card 5

Front

Strong, Rigid Board made from bleached pulp, Excellent for Printing/ USES: Book covers, Packaging/ ADV: Strong, Rigid, Accepts Paint well/ DIS: Can be Expensive

Back

Preview of the back of card 5
View more cards

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