2PlasticCan you name different products made out of plastic ?Can you think of advantages or disadvantages of using plastics in our daily lives?
3PlasticsTask – name 10 objects made of plastic that is in close proximity to you.
4Plastic how do we use plastics in our homes? Photographs below courtesy of
5Plastic Can you think of ways we use plastics in: packagingCan you think of ways we use plastics in:entertainment
6Thermoplastics Thermosetting Plastic There are two types of plastic : This material is man made and is a by product of the oil industry.There are two types of plastic :ThermoplasticsThermosetting
7Thermoplastics materials PolypropyleneThese are described as plastics that can be reformed using heat : this plastic has a memory, it returns to its original flat shape when re-heated.Here are some examples and their uses :Acrylic – available in almost any colour in sheet rod or tube form, can be shaped using a line bender or vacuum former.ABS.thermoplastic resin.ABS – a very commonly used plastic can be injection moulded from a powder form.Styrene – very good for vacuum forming.
8Thermosetting materials Kettle saucepan handlesThese are described as plastics that do not reform using heat, they “SET” and cannot be reshaped .Here are some examples and their uses :Urea formaldehyde – electric plugs and socketsMelamine – kitchen worktops, unbreakable drink mugsPolyester resin – poured into moulds to make products or for boat repairHarry Allen’s paper weight/doorstop made from resin
9Materials – Plastics Materials - Plastics Plastics are synthetic resinous substances that can be moulded with the help of heat or pressure. There are two main classes of plastics:Thermosetting – plastics that can only be heated and be moulded once. If re-heated they cannot soften.Thermoplastics – plastics that are moulded by heating and can be remoulded if heated again Thermoplastics soften when heated and can be shaped when hot. The plastic will harden as it cools down.ThermoplasticThermoplastic propertiesThermoplastic usesExample outcomesAcrylics or Perspex (Polymethyl Methacrylate)Stiff, hard, shiny, brittle in small sections, durable, scratches easily, available in different colours, good electrical insulatorUsed for signs, key rings, lighting, storage containersHigh impact polystyrene (HIPS)Light but strong plastic, available in sheets in a variety of thicknesses and colours and softens at about 95 degreesUsed for vacuum forming and making outer casings and packaging for productsAcetateHard, shiny and translucent/transparentUsed in badge-making, packaging and for overhead projector transparenciesExpanded polystyrene (styrofoam)White, lightweight and crumblyUsed for protective or insulating packaging
10Materials – Plastics Materials - Plastics Thermoplastic Thermoplastic propertiesThermoplastic usesExample outcomesPolypropylene (PP)Light, hard, flexible but can scratch easily. Durable to wear and has good resistance to chemicalsUsed for different kinds of packaging, chairs, gadgets, textiles and automotive componentsLow density polyethylene (LDPE)Soft, flexible, good resistance to chemicals, good electrical insulator, toughUsed for packaging film, carrier bags, bottles, toysHigh density polyethylene (HDPE)Hard, stiff and strong. Able to be sterilisedUsed for plastic bottles, tubing and household equipmentCorrugated plasticLightweight, rigid and weatherproofUsed for sign boards and foldersLow-tack masking filmFlexible and transparentUsed to position sticky-backed vinyl letters or images onto a chosen surface. Used for creating signs, stencils and vehicle signagePolyvinyl chloride (PVC)Stiff, hard wearing, brittle but can be treated to make it softer and more rubberyUsed for blister packs, window frames, records and clothing
12Are there any problems or issues with using carrier bags ? Task 1 – in smalls group, list three advantages and disadvantages of using carrier bags.Task 2 – in your group consider two ways of improving any problems that you have identified.
13How could this number be reduced? How many supermarket carrier bag does the average shopper use to carry goods home every week?5151220How could this number be reduced?By using shopper bags, how many carrier bags could we cut down on using in a year?20 plastic bags a week x 52 weeks =Shopper bags1,040Supermarkets hand out 1.75 billion bags a year.
14Just one more phone …it won’t matter. What happened to your old mobile phone?11 million people expect to get a new mobile phone over Christmas in the UK.2 million mobile phones are expected to go on the scrapheap during a Christmas period.What can be done to improve this?
15Before we use plastic materials aspects for consideration Plastic and sustainability aspects.Plastic is a precious resource made from oil. Because it is such a versatile material, we use it a lot.Working in small groups – discuss the following and feed back to the class.1. List 5 products where plastic is the best material to use.2. List 5 plastic products that no-one should ever bothered making.3. List 5 plastic products that would be better made from a different materials.Photographs courtesy of photo gallery wales.