Summary Unit 3

Plastic materials are classified by...

• The structure of their polymer chains

• How easily they melt

• How easily they can be modelled

Plastic materials are formed by chains of monomers called...

• Elastomers

• Thermoset

• Polymers

Which type of plastic material can be softened by heating and can be formed and melted as many times as we want?

• Thermoset

• Filaflex

• Elastomers

• Thermoplastic

Which type of plastic material can be shaped using heat BUT, pnce they have been formed, cannot be remelted?

• Thermoplastic

• Thermoset

• Elastomers

• Filaflex

Examples of thermoplastic materials include...

• ABS, Bakelite and PLA

• PLA, polypropylene and polystyrene

• ABS, PLA and neoprene

We can use the plastic extrusion process to produce...

• Sheets of plastic and objects with hollow cavities

• Cylindrical tubes but not square ones

• Tubes with different profiles depending on the shape of the extrusion nozzle

By blow moulding plastics, we can produce...

• Thin, flexible plastic sheets

• Extruded plastic tubes

• Hollow plastic objects created from tubes made by estrusion

Special plastics for 3D printing...

• Are obtained from elastomers such as Filaflex

• Are all obtained from oil and are thermoset plastics

• Are obtained from thermoplastics and additives such as plaster or sawdust

The files understood by 3D printers for printing parts...

• Are in STL format

• Are in SCAD format

• Are in GCODE format

The Resin Identification Code (RIC) classifies plastics according to...

• How easily they disintegrate

• Their resistance to temperature

• Their recycling possibilities