plastics-thermosetting Flashcards
what are theromsetting plastics made of?
Thermosetting Plastics are made up of lines of molecules which are heavily cross linked. It creates a rigid molecular structure.
can they be reheated and reshaped?
They may be heated the first time and shaped but they become permanently stiff and solid. They cannot be reshaped again.
what is polyurethane?
This plastic forms the basis of many paints and varnishes because it is very tough and has water
resistant qualities
what is Melamine Formaldehyde used for?
Used in the production of plastic laminates because of its smooth surface and hygienic qualities. It is also used in electrical plugs and sockets because it can be cast and it is an excellent insulator.
Polyester resins.
If resins are combined with a material such as fibre glass the result is a very tough material that can resist impact. This type of material is known as a glass reinforced plastic (GRP) and is used in car body repairs, sailing boats, corrugated sheet because of its lightness, toughness and resistance to water.
