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GCSE Product Design WJEC > Thermosetting and Thermoplastic (plastics) > Flashcards

Thermosetting and Thermoplastic (plastics) Flashcards

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1
Q

What are thermosetting plastics?

A

These plastics can only be formed once and will not soften when heated and are used when resistance to heat is important (eg kettles, chargers, plugs).
They have high melting points, brittle and good insulators.
This means they are single use and can’t be recycled.

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2
Q

Examples of thermosetting plastics and uses

A 
Melamine-formaldehyde (MF)- Plastic table wear
Phenol formaldehyde (PF)- Pool balls
Urea- formaldehyde (UF)- plug sockets
Epoxy resin (ER)- casting
Polyester resin (PR)- Hard hats
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3
Q

What are composite materials and examples

A 
Two or more materials bonded together to enhance their properties. 
- Fibreglass (Glass reinforced plastic) 
-  Carbon fibre 
Pro + Stronger and lighter
Con - expensive
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4
Q

What are thermoplastics (or thermoforming)?

A

Plastics that soften on heating and harden when cooled over and over again. They are recyclable (https://www.bbc.co.uk/bitesize/guides/z74bcj6/revision/4)

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5
Q

Examples of thermoplastics plastics and uses

A

PVC (Polyvinyl Chloride)- ridged forms for piping and flexible forms for credit cards

  • High impact polystyrene (HDPE)- yogurt pots

Polystyrene

Acrylic-

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6
Q

What is the properties of Melamine-formaldehyde (MF)?

A
  • Chemical resistance
  • Water resistance
  • Scratch and stain resistance
    (Kitchen tops/ table wear)
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7
Q

What is the properties of Epoxy resin?

A
  • Strong
  • Chemical and heat resistant
  • thermal insulator
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8
Q

What is the properties of Urea formaldehyde

A
  • Hard
  • stiff
  • great electrical insulator
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9
Q

What is the properties of Polyester resin?

A
  • Strong
  • High thermal resistance
  • No shrinkage
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10
Q

What is the properties of Acrylic?

A
  • Weather resistant
  • easy to scratch
  • brittle
  • Usually transparent
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11
Q

What is the properties of Polypropylene (PP)?

A
  • Strong
  • tough
  • heat and chemical resistant
    (Children’s toys, Film/ game cases, chairs)
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12
Q

What is the properties of Polyvinyl chloride (PVC)?

A
  • Variable flexibility

- chemical and weather resistant

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13
Q

What is the properties of High density polythene (HDPE)?

A
  • Stiff
  • Light weight
  • chemical resistant
  • Malleable when heated
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14
Q

What is the properties of Polystyrene (PS)?

A
  • Inexpensive

- Easy to cut/ shape.

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GCSE Product Design WJEC (16 decks)

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