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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 are epoxy resin, melamine
formaldehyde, polyester resin and urea formaldehyde.
| Thermosetting
plastics |
Thermosetting
plastic Properties |
Thermosetting
plastic uses |
Example product |
| Epoxy resin (Epoxide,
ER) |
Good electrical insulator,
hard, brittle unless reinforced, resists chemicals
well. |
Used for casting and encapsulation,
adhesives, bonding of other materials. Used
for printed circuit boards (PCB’s) and
surface coatings. |
 |
| Melamine formaldehyde
(MF) |
Stiff, hard, strong, resists
some chemicals and stains. |
Used for Laminating work
surfaces, electrical insulation, tableware. |
 |
| Polyester resin
(PR) |
Stiff, hard, brittle unless
laminated, good electrical insulator, resists
chemicals well. |
Used for casting and encapsulation,
bonding of other materials, car bodies, boats.
|
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| Urea formaldehyde
(UF) |
Stiff, hard, strong, brittle,
good electrical insulator. |
Used for electrical fittings,
handles and control knobs, adhesives. |
 |
Phenol formaldehyde
(PF, Bakelite)
|
A colourless polymer -
coloured with artificial pigments to produce
a wide range of different colours. |
Used for dark coloured
electrical fittings and parts for domestic
appliances, bottle tops, kettle handles, saucepan
handles. |
 |
Memory tip: Remember Bets Pup!
B - Bakelite
E - Epoxy resin
T - Thermosetting
S - Shaped once
P- Polyester resin
U - Urea formaldehyde
P- Plastic
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Mr DT says 'Read
the text above and then answer these questions
below'. Write your answers on a sheet of
paper, don't forget to write your name on
the sheet!:-
1). Describe thermosetting plastics in your
own words?
2). What are the properties of epoxy resin?
3). What are the uses of melamine formaldehyde?
4). What is polyester resin used for?
5). Why is urea formaldehyde used for plugs?
6). What is Phenol formaldehyde used for?
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