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Design Technology > GCSE Resistant Materials - Polymers > Flashcards

GCSE Resistant Materials - Polymers Flashcards

1
Q

What is the finish Buffing Compound/ Polish?

A

Buffing wheel or hand-polished with a a soft cloth

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2
Q

How do you mark out a sharp, straight line of any angle?

A

Permanent marker pen

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3
Q

How do you mark out a parallel line?

A

An odd leg caliper

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4
Q

How do you mark out a perpendicular/ 90• angle?

A

Try square

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5
Q

How do you mark out a 45• angle?

A

A mitre square/ combination square

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6
Q

How do you mark out the centre of a hole?

A

Permanent marker pen

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7
Q

How do you mark out the centre of a round piece of material?

A

Centre square

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8
Q

How do you mark out angles/ curves - and circles?

A

Dividers

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9
Q

How do you mark out an irregular shape?

A

A template

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10
Q

How does a vacuum former work?

A
  1. HIPS is heated
  2. Once hot, solid former pressed onto HIPS from a bed that can rise
  3. Vacuum all air around former removed
  4. HIPS takes form of solid former
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11
Q

How do you cut a straight line?

A

A scoring tool or hacksaw

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12
Q

How do you cut curved lines?

A

Coping saw or piercing saw

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13
Q

How does injection moulding work?

A

Thermoforming plastics, heated, injected into mould

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14
Q

How does extrusion work?

A

Thermoforming plastics (and metals), heated then pushed through a die

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15
Q

What is a thermoforming plastic?

A

A polymer that can soften and become malleable when heated

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16
Q

What are thermosetting plastics?

A

Polymers that harden when heat is a applied

17
Q

What is nylon?

A

Thermoforming plastic, low friction resistance and good chemical resistance, often used in rope and mechanical components(gears, bearings)

18
Q

What are HDPE and LDPE (polyethylene)?

A

Thermoforming plastics, LDPE less expensive, HDPE more expensive, resistant to chemicals and some float, often used in packaging films and injection and blow-moulded bottles and containers.

19
Q

What is polyvinyl chloride?

A

Thermoforming plastic, resistant to chemicals and solvents, good tensile strength and impact resistant, often used in drinks bottles and bank/smart cards

20
Q

What is acrylic(PMMA)?

A

Thermoforming plastic, hard, good resistance to UV light and weather, tensile strength and impact resistant, often used in bathroom furniture and aircraft canopies.

21
Q

What is Polystyrene?

A

Thermoforming plastic, poor resistance to UV light, often used in toys, food packaging and light/car fittings

22
Q

What is polypropylene?

A

Thermoforming plastic, high resistance to chemicals and stress, flexible, often used in chemical containers and household appliances

23
Q

What is ABS?

A

Thermoforming plastic, durable, resistant to chemicals and weather, and rubber-like properties, often used in boat/dingy hulls and domestic appliance housings (telephone)

24
Q

What is polyester resin?

A

Thermosetting plastic, stable, low-cost, easy to use, good mechanical, chemical resistance and electrical properties, often used in printed circuit boards, and adhesives.

25
Q

What is epoxy resin?

A

Thermosetting plastic, high adhesive strength, electrical insulation and food chemical resistance, often used in sealants, moulds/dies for thermoforming plastic parts

26
Q

What is melamine formaldehyde?

A

Thermosetting plastic, hard and chemical resistant,often used in electrical plugs, switches and sockets

27
Q

What is urea formaldehyde?

A

Thermosetting plastic, high tensile strength, surface hardness, low water absorption, often used in electrical fittings and adhesive to bond pressed wood products (MDF)

28
Q

What is phenol formaldehyde?

A

Thermosetting plastic, high hardness, good thermal stability and chemical resistance, often used in laboratory worktops and printed circuit boards

29
Q

What are some of advantages of polymers?

A
30
Q

What are some disadvantages of polymers?

A
  • Most are a product of crude oil, doest biodegrade and can pollute oceans

Design Technology (5 decks)

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