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"Design and Technology - Natural Timber" Flashcards | Quizlet
Plastics
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Polymer
substance
or fibre with a molecular structure made up of
smaller
units
bonded
together.
Natural polymer
polymer made from
natural
sources
What are the forms
polymers
can available
in
?
film
,
bar
, rod,
granules
,
sheets
Thermoforming
polymers
polymers can be
softened
by
heating
and moulded into almost any
shape
can used in
bending
,
vacuum
forming,
moulding
and extrusions
can be
recycled
Thermosetting polymers
cannot be
reheated
or reformed once they have been
formed
and cooled
cannot be
recycled
excellent
insulators
Name all thermoforming plastics
-Polypropylene
(PP)
-Polythene
(PE)
-polystyrene
(PS)
-Polyvinyl chloride
(PVC)
name all the thermosetting plastics
melamine
formaldehyde
polyester
resin
epoxy
resin
polythene
thermoforming
tough,
flexible
, easily
moulded
used for
carrier bags
, bin liners,
washing up bottles
Polystyrene (PS)
thermoforming
lightweight
,
food
safe, good
impact
strength
used for disposable
plastic
cutlery
,
CD
case , smoke detector,
plastic
models
Polypropylene
(
PP
)
thermoforming
plastic
good chemical
,
heat
resistance and semi-rigid
used bucket,
bowls
, crates ,
toys
and bottle caps
Polyvinyl Chloride
(
PVC
)
thermoforming
plastic
resistant to corrosion, flexible, durable
used for water pipes , window frames, raincoats
Melamine Formaldehyde (MF)
Thermosetting
plastic
tasteless,
odourless
,
chemical
,
heat
, shrink, hard,
scratch
and
impact
resistant