In this unit, the sources, origins and properties of polymers are covered in the first lesson, along with the processes of fractional distillation and cracking. The use of plastic additives is also covered. Lesson two concentrates on working with polymers in school environments. This covers school-based processes, fixings and production techniques. Commercial cutting, forming and processing techniques in manufacture are covered in the third lesson. These include extrusion, blow moulding and injection moulding. Finishing techniques and quality control are also covered as well as reinforcing students’ understanding of the properties of the different types of plastic available.