Non-ferrous means a metal that does not contain iron.
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Name one metal that is corrosion resistant
Aluminium.
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why is Aluminium so expensive?
It comes from tropical islands.
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What is an alloy?
An alloy is a mixture or solid solution of two or more metals, or of other elements and a metal.
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Why are alloys made?
To produce stronger/more flexible or durable metals. Sometimes all.
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What does alloying do to metals properties?
Makes the melting point higher.
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Where do plastics come from?
Crude oils and polymers.
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What is crude oil?
A layer of the earths crust made up of dead matter.
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What are polymers?
Hydrocarbon chains.
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Are metals sustainable?
Yes.
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Name two properties of aluminium
Corrosion resistant and light.
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What is a hardwood?
They are generally slow growing which tends to make them harder and more expensive. Please note though that not all hardwoods are hard
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What is a softwood?
Softwoods come from coniferous trees which have needles instead of leaves. Softwoods grow faster than hardwoods and so are cheaper they are also easier to work with as they are softer than hardwoods.
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Softwoods
European redwood, Yellow cedar, Parana pine, Spruce, Scots pine
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Scots pine
A straight-grained softwood but knotty. Light in colour. Fairly strong but easy to work with. Cheap and readily available. A softwood. Scots pine Used for DIY and cheap quality furniture. Mainly used for constructional work and simple joinery.
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European redwood
Quite strong, Lots of knots, durable when preserved. cheap European redwood Used for general woodwork, cupboards, shelves, roofs.
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Yellow cedar
A pale yellow-coloured softwood with a fine even texture. Light in weight but stiff and stable. Yellow cedar Used for furniture, boat building, veneers, and model making
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Parana pine
Hard and straight-grained. Almost knot free. Fairly strong and durable. Expensive. Pale yellow in colour with red/brown streaks. A softwood. Parana pine Used for good quality knot free pine red / brown furniture such as doors and staircases.
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Spruce
Creamy-white softwood with small hard knots. Not very durable. A softwood. Spruce Used for general indoor work, whitewood furniture used in bedrooms and kitchens.
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Softwood properties
Softwoods come from coniferous trees. • Softwoods are special because they don’t lose their needles. • Softwoods have needles instead of leaves. • Softwoods grow faster than hardwoods so are cheaper. • Often used as building material. • Trees grow ta
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Hardwood properties
Hardwoods are usually have broad leaves. • Hardwoods come from deciduous or broad-leafed trees. • Hardwoods are special as they are deciduous this means they lose their leaves. • You can distinguish hardwoods by the structure of the wood grain.
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Beech
A straight-grained hardwood with a fine texture. Light in colour. Very hard so is ideal to be used where it is being bashed around and used often. Beech is also very easy to work with. Beech. Used for furniture, toys, tool handles. Can be steam bent.
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Oak
A very strong wood which is light in colour. Open grain. Hard to work with. When treated it looks very classy and elegant. A hardwood. Oak used for high class furniture, boats, beams used in buildings, veneers.
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Mahogany
An easy to work wood which is reddish brown in colour. This wood is very expensive. A hardwood. Mahogany Used for expensive indoor furniture, shop fittings, bars, veneers.
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Teak
A very durable oily wood which is golden brown in colour. Highly resistant to moisture and outdoor weather. A hardwood. Teak Used for outdoor furniture, boat building, laboratory furniture and equipment.
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Balsa
is a pale white to gray. It has a distinct velvety feel. It has exceptional strength to weight properties. It is the lightest and softest wood on the market. A hardwood. Used for light work such as model making and model airplane construction.
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Thermosetting plastics
Thermosetting plastics can only be heated and shaped once. If re-heated they cannot soften as polymer chains are interlinked. Separate polymers are joined in order to form a huge polymer. The main thermosetting plastics
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Epoxy resin (Epoxide, ER) Thermosetting
Good electrical insulator, hard, brittle unless reinforced, resists chemicals
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Melamine formaldehyde (MF) Thermosetting
Stiff, hard, strong, resists some chemicals and staining
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Polyester resin (PR) Thermosetting
Stiff, hard, brittle unless laminated, good electrical insulator, resists chemicals
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Urea formaldehyde (UF) Thermosetting
Stiff, hard, strong, brittle, good electrical insulator
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Phenol formaldehyde (PF, Bakelite) Thermosetting
Hard and brittle
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Other cards in this set
Card 2
Front
What does non-ferrous mean?
Back
Non-ferrous means a metal that does not contain iron.
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