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Design And Technology > Plastics > Flashcards

Plastics Flashcards

1
Q

Three types of plastic

A

Thermo plastic
Thermosetting plastic
Elastomers

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2
Q

What are the 6 thermoplastics

A

LDPE
HDPE
Polypropylene
Acrylic
ABS
PVC
UPVC
PET

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3
Q

What are the 3 thermoset polymers?

A

Urea formaldehyde
Polyester resin
Epoxy resin

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4
Q

What examples of elastomers are there?

A

Rubber
Silicone
Neoprene

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5
Q

What are the features of acrylic making it suitable for car light casings and CNC laser cut items?

A

Tough (durability)
Hard (maintains high quality surface finish)
Available in transparent and translucent forms (variation of options and allows varying amounts of light through)

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6
Q

Uses of acrylic

A

Lighting units
Baths
CNC laser cut items

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7
Q

What is LDPE used for

A

Squeezy bottles
Carrier bags
Bin liners
Cling film

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8
Q

Why is LDPE suitable for packaging?

A

Very tough (withstand impact so unlikely to break making the things inside more protected)
Chemical resistance (will not react to food or substances inside)
Weatherproof (better protected items)
Low level rigidity (flexible)
Translucent (enables consumers to see within lackaging

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9
Q

What can HDPE be used for?

A

Chemical drums
Long life carrier bags
Kitchenware
Buckets
Bowls

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10
Q

What makes HDPE suitable for kitchenware?

A

Weatherproof (protects things within it)
Tough (unlikely to rip or break under impact)
Good chemical resistance (will not react to food when eating)

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11
Q

What can PET be used for?

A

Single use drink bottles
Shampoo bottles
Food packaging

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12
Q

What makes PET suitable for single use drinks bottles?

A

Hard (unlikely to scratch and cause leakage)
Tough (unlikely to deform under impact making it unsuitable for purpose)
Good chemical resistance

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13
Q

What can PVC be used for?

A

Hose pipes
Medical grade tubing
Inflatable products
Cable insultaion

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14
Q

What makes PVC suitable for medical grade tubing?

A

Chemical resistance (will not deform when present to chemicals)
Flexible (ability to bend around edges and adapt)
Transparent (can see within it to ensure working correctly)
Tough (unlikely to deform under impact)

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15
Q

Difference between PVC and uPVC

A

PVC contains plasticiser additives making it more flexible

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16
Q

What is uPVC used for?

A

Window frames
External doors
Guttering
Bank cards

17
Q

What makes uPVC suitable for window frames?

A

Rigid (maintain its shape despite weather conditions)
Opaque
Good weathering resistance (durability)
Fire retardant
Hard

18
Q

What is PP used for?

A

Rope
Folders
Food containers
Medical equipment

19
Q

What makes PP suitable for rope?

A

Good chemical resistance
Good fatigue resistance
Tough
Available in translucent

20
Q

What is ABS used for?

A

Lego
Rigid luggage
Handles
Telephone handsets

21
Q

What makes ABS suitable for luggage?

A

Extremely tough (thrown around without damaging)
Hard (unlikely to scratch ruining aesthetic)
Available in opaque (keep luggage private)

22
Q

What is a thermoplastic?

A

A material that can repeatedly reheated and reshaped

23
Q

What is a thermosetting plastic?

A

When heated it undergoes a chemical change causing cross links to form between molecules. Therefore they cannot be remelted and reused

24
Q

What can epoxy resin be used for?

A

Adhesives
Surface coatings
Encapsulation of electrical components
Pacemakers

25
Q

What makes epoxy resin suitable for adhesives?

A

Rigid (hold its structure)
Hard (won’t scratch weakening its structure)
Tough (withstand impacts)
Chemical resistant (chemicals will not weaken the structure)

26
Q

What can urea formaldehyde be used for?

A

Electrical fittings
Adhesives

27
Q

What makes urea formaldehyde suitable for electrical fittings?

A

Hard (protect electrics)
Heat resistant (fitting will heat up when electrics in use)
Electrical insulator (prevent electric shocks if touched)
Brittle

28
Q

What can polyester resin be used for?

A

Castings
Layup process for GRP
Car parts

29
Q

What makes polyester resin suitable for layup process?

A

Heat and chemical resistant
Rigid
Brittle

30
Q

Uses for natural rubber

A

Tyres
Tubes
Hoses
Balloons
Footwear

31
Q

What makes natural rubber suitable for tyres

A

High tensile strength
Good hardness
Tough
Electrical insulator
Cold resistance

32
Q

What can neoprene be used for?

A

Wetsuits
Laptop case
Shock absorber seals
Hose cover

33
Q

What makes neoprene suitable for a wetsuit?

A

Oil and chemical resistant
Weather resistant
Abrasion resistant
Thermal resistant
Tough

34
Q

What is an elastomer?

A

Material which at room temperature can be deformed under pressure and then upon release of the pressure, will return to their original shaoe

Design And Technology (18 decks)

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