GCSE Resistant Materials - Polymers Flashcards
What is the finish Buffing Compound/ Polish?
Buffing wheel or hand-polished with a a soft cloth
How do you mark out a sharp, straight line of any angle?
Permanent marker pen
How do you mark out a parallel line?
An odd leg caliper
How do you mark out a perpendicular/ 90• angle?
Try square
How do you mark out a 45• angle?
A mitre square/ combination square
How do you mark out the centre of a hole?
Permanent marker pen
How do you mark out the centre of a round piece of material?
Centre square
How do you mark out angles/ curves - and circles?
Dividers
How do you mark out an irregular shape?
A template
How does a vacuum former work?
- HIPS is heated
- Once hot, solid former pressed onto HIPS from a bed that can rise
- Vacuum all air around former removed
- HIPS takes form of solid former
How do you cut a straight line?
A scoring tool or hacksaw
How do you cut curved lines?
Coping saw or piercing saw
How does injection moulding work?
Thermoforming plastics, heated, injected into mould
How does extrusion work?
Thermoforming plastics (and metals), heated then pushed through a die
What is a thermoforming plastic?
A polymer that can soften and become malleable when heated
What are thermosetting plastics?
Polymers that harden when heat is a applied
What is nylon?
Thermoforming plastic, low friction resistance and good chemical resistance, often used in rope and mechanical components(gears, bearings)
What are HDPE and LDPE (polyethylene)?
Thermoforming plastics, LDPE less expensive, HDPE more expensive, resistant to chemicals and some float, often used in packaging films and injection and blow-moulded bottles and containers.
What is polyvinyl chloride?
Thermoforming plastic, resistant to chemicals and solvents, good tensile strength and impact resistant, often used in drinks bottles and bank/smart cards
What is acrylic(PMMA)?
Thermoforming plastic, hard, good resistance to UV light and weather, tensile strength and impact resistant, often used in bathroom furniture and aircraft canopies.
What is Polystyrene?
Thermoforming plastic, poor resistance to UV light, often used in toys, food packaging and light/car fittings
What is polypropylene?
Thermoforming plastic, high resistance to chemicals and stress, flexible, often used in chemical containers and household appliances
What is ABS?
Thermoforming plastic, durable, resistant to chemicals and weather, and rubber-like properties, often used in boat/dingy hulls and domestic appliance housings (telephone)
What is polyester resin?
Thermosetting plastic, stable, low-cost, easy to use, good mechanical, chemical resistance and electrical properties, often used in printed circuit boards, and adhesives.
What is epoxy resin?
Thermosetting plastic, high adhesive strength, electrical insulation and food chemical resistance, often used in sealants, moulds/dies for thermoforming plastic parts
What is melamine formaldehyde?
Thermosetting plastic, hard and chemical resistant,often used in electrical plugs, switches and sockets
What is urea formaldehyde?
Thermosetting plastic, high tensile strength, surface hardness, low water absorption, often used in electrical fittings and adhesive to bond pressed wood products (MDF)
What is phenol formaldehyde?
Thermosetting plastic, high hardness, good thermal stability and chemical resistance, often used in laboratory worktops and printed circuit boards
What are some of advantages of polymers?
What are some disadvantages of polymers?
- Most are a product of crude oil, doest biodegrade and can pollute oceans
