What are thermoplastics?
plastics that can be reheated and reshaped and dont undergo significant chemical change
What are thermosetting plastics?
plastics that cannot be reheated and remoulded. the bond is very strong
What are 7 different types of thermoplastics?
acrylic LDPE HDPE Polypropylene PVC Nylon Hips
What are different types of thermosetting plastics?
araldite polyurethane melamine formaldehyde Urea Formaldehyde Polyester resins
Are thermosetting plastics difficult to recycle?
yes
What are the properties of acrylic?
different colours
easy to cut and shape
used for safety glasses/baths/signs
What are the properties of LDPE?
tough
flexible
used for plastic bags and bottles
What are the properties of HDPE?
hard/rigid
used for machine parts, buckets and crates
What are the properties of polypropylene?
robust
strong
used for injection moulding
used for food containers/chairs/storage units
What are the properties of PVC?
tough
flexible
used for water pipes, raincoats and electrical wire coatings
What are the properties of nylon?
oily nature
used in engineering
used for gears/wheels/clothing
What are the properties of HIPS?
light
strong
can be vacuum formed
used for hard hats and trays
What are the properties of araldite?
comes in 2 parts
resin and catalysts
permanently bonds 2 things together
What are the properties of polyurethane?
forms basis of many varnishes
tough
water ressistent
What are the properties of melamine formaldehyde?
smooth surface
hygenic qualities
insulator
used for kitchen worktops
What are the properties of Urea formaldehyde?
high hardness
high toughness
scratch resistant
insulator
What are the properties of polyester resins?
can be combined with fibreglass to produce GRP (glass reinforced plastic that is used for car body repairs and sailing boats
