1. Use the knowledge you have learnt in previous lessons
Learn about Thermosetting & thermoforming plastics (Polymers)
You will be tested on this topic
It is important to be aware of what plastics are and how/ where they are used
(2 singles and a test in the 3rd single lesson)
Use the knowledge you have learnt in previous lessons

2. Key words Plastics, Thermo forming, Thermo setting, Polypropylene,
Polymers
STARTER
This is a simple starter activity to get students to focus on plastic products common to them.
You can replace the list of products and plastics with suitable examples from the classroom students are in.

3. Starter
Take a few minutes to look around the room and identify some everyday plastics.
Can you find the following objects and decide what type of plastic they are made from?
Polypropene
Chairs
Jumper
Comb
Carrier bag
Pencil case
Acrylic
Nylon
STARTER
This is a simple starter activity to get students to focus on plastic products common to them.
You can replace the list of products and plastics with suitable examples from the classroom students are in.
Polyethene
Neoprene

4. Where do plastics come from?-
Natural plastics, are found in animal horns (Casein glue), trees (latex, rubber)
Synthetic plastics, are all modern plastics the source of these plastics is crude oil.
Made by a process called Polymerisation

5. Types of plastics Thermoforming
Plastics can be reheated and therefore reshaped.
Soften when heated
Can be reshaped
More commonly used in school
CAN be recycled
Thermosetting
Plastics cannot be reheated
and reshaped due to a chemical reaction that occurs when they are first manufactured.
Initially set by heat
Cannot be reshaped once set
Extremely strong and durable
CANT be recycled
Write key terms in box on worksheet.
Thermoforming- Can be adjusted by heat sheets, granules, powder form and rods
Thermosetting- cant be reheated, resin or powder form
The word thermoplastic and thermoset can be explored before revealing the descriptions.
For example,
Thermo = heat
Plastic = bend without breaking/flexible with the application of heat
Set = will not move after initial heat is applied.
Think of the word “set” what does it mean?
(Put something is a set position)

6. Thermosetting and thermoforming
Click here
5 mins but can miss ending off.

7. Uses of plastics- Thermo setting
Name
Uses
Pictures
Urea
Formaldehyde (UF)
sockets/ electrical fittings.
Melamine formaldehyde (MF) -
pan handles, electrical plugs, kitchen laminated surfaces
(ER) Epoxy resin
Metal coatings, used in electronics- often added to other materials to protect and reinforce.
PR Polyester resin
Bonded to other materials- i.e.
FRP (fibre class reinforced Plastic for reinforcement.
a solid or liquid synthetic organic polymer used as the basis of plastics, adhesives, varnishes, or other products.

8. Properties of thermosetting
Waterproof
Durable
Hard
Scratch resistant
Resists high temperatures
Electrical insulator

9. Uses of plastics- Thermoforming
Name
Uses
Pictures
Polythene
plastic bags, food containers, and other packaging.
High impact Polystyrene (HIPS)
packaging, cd casing, toys, TV parts, plastic cutlery,
Polypropylene
Chairs, boxes, storage, kettle, bottles, straws
PVC
( polyvinyl chloride)
Construction industry (pipes)
HIPS - High Impact Polystyrene, it is a tough, rigidplastic material with high impact strength which can be guillotined, punched, routered or sawn easily, and is readily available in a wide variety of colours
It is glossy and is an easy to process plastic that is also sturdy and durable. It is furthermore also a rather flexible product that can be used for a diverse range of applications because it can resist high impact. The product is hygienic and visually attractive.

10. (forms plastic is sold in)
Stock forms
(forms plastic is sold in)
Sheet
Film
Bar
Rod
Tube

11. Properties of thermo plastics/ forming
Waterproof
Tough
Lightweight
Easily coloured
Durable
Scratch resistant
Good strength to weight ratio
Corrosion resistant
Chemically resistant
Easy to mould
Good flexibility

12. Properties of plastic and what they mean
Hardness
Is the ability of a material to resist wear, scratching and indentation
Some are harder than others- but prone to scratching.
Elasticity
Ability for a material to bend and then return to its original position.
Good elasticity- esp. thermoforming plastic.
Conductivity
Conductivity- ability for electricity to pass through.
They have low electric conductivity –so are electrical insulators. .
Toughness
Is the ability of a material to withstand blows or sudden shocks without breaking
Some are tougher than others.
Strength
Is the ability of a material to withstand a force without breaking or bending
Some are, some are not- a composite material can increase this.