Key term
CCEA A-Level Technology and Design 8900
Material Selection and Wood
Metals
Plastics
Composite and Emerging Materials
Processing Materials
Product Analysis and Design Communication
Design for Manufacture, Quality and Safety
Electronic Control SystemsOption A
Topic overviewControl systems, feedback and electronics safetyResistors, Ohm's law and power ratingsCapacitors and RC timingPotential dividers, sensors and comparatorsSwitches, pull-up and pull-down resistorsOutput devices and LEDsTransistors, Darlington pairs and thyristorsLogic gates, truth tables and flip-flops555 monostable and astable timers
Microelectronic Control SystemsOption A
Topic overviewMicrocontroller systems, ADCs and DACsStrain gauges and bridge circuitsOptical switches, encoded discs and Schmitt triggersOp-amp amplifiers and gainZener diodes and voltage regulatorsKarnaugh maps and binary countersSeven-segment, LCD and dot matrix displaysPIC flowcharts and programmingDC motors, stepper motors and driver circuits
Mechanical and Pneumatic ComponentsOption B
Topic overviewOpen and closed loop mechanical and pneumatic controlSafe working with compressed air and mechanismsLevers, linkages and momentsGear types and gear trainsPulleys, belts, chains and shaft fixingsCams, cranks and converting motionCompressed air supply and pneumatic valvesCylinders, shuttle valves, restrictors and reservoirsPneumatic circuits for logic, timing and speed control
Mechanical and Pneumatic SystemsOption B
Topic overviewHydraulics, system limitations and plant safetyTorque, work, power and air consumptionVacuum handling, proximity sensors and 5/3 valvesSequential and cascade pneumatic circuitsCam profiles and follower displacement diagramsGear geometry, pulley blocks and ratchetsToggles, treadles, shafts and couplingsFriction, brakes and clutchesBearings, lubrication and seals
Designing and Manufacturing ProductsOption C
Topic overviewResearch, questionnaires and specificationsIdea generation, critiques and computer simulationManufacturing planning and product evaluationCFRP, GRP, Kevlar and tungsten carbideSmart materials, nanotechnology and biophotovoltaicsIsometric, perspective and assembly drawingLaminating, steam bending, cutting and printing processesRisk assessment and product safety lawScales of production, JIT and cell productionQuality assurance, ISO 9001 and continuous improvementDesign influences and intellectual property rights
Product Design in Industry and SocietyOption C
Topic overviewLife-cycle environmental impact and climate changeThe 6Rs, waste and environmental legislationSustainable metals, plastics and degradable polymersProduct life cycles, consumer types and relaunchesCAD, CAM, 3D scanning and quick-change mouldingMarket pull, technology push and market strategyPrice, place and promotionJigs, fixtures and ICT in quality controlDesign for maintenance, inclusion and scale productionRendering, typography and presentationDyson, Baylis, Memphis and Apple
Product Development
Product and System Design and Manufacture
Plastics
HDPE, LDPE and PET
- 3 things to know
- AS 1 Paper 1
Overview
The properties and uses of HDPE and LDPE and why they differ, shared working characteristics, PET drinks bottles and stretch blow moulding, recycled PET and choosing a polymer.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Give typical uses of HDPE.
Key term
Why is HDPE suitable for a bottle of bleach?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Describe the properties of HDPE.
Model answer
HDPE is stiff, strong and tough for a polyethylene, with good chemical resistance. HDPE is lightweight, food safe and has a waxy, low-friction surface.
- 2
Give typical uses of HDPE.
Model answer
HDPE is used for milk bottles, detergent bottles, buckets, crates and chopping boards. HDPE is also used for underground water and gas pipes.
- 3
Why is HDPE suitable for a bottle of bleach?
Model answer
HDPE resists attack from strong chemicals such as bleach. HDPE is tough enough not to split if the bottle is squeezed or dropped.
- 4
Why is HDPE used for chopping boards?
Model answer
HDPE is hygienic, does not absorb liquids and resists damage from knives. HDPE is also food safe and can be cleaned in a dishwasher.
- 5
Describe the properties of LDPE.
Model answer
LDPE is soft, flexible and tough, with good chemical resistance. LDPE is a good electrical insulator and has a low softening temperature.
- 6
Give typical uses of LDPE.
Model answer
LDPE is used for carrier bags, bin liners and packaging film. LDPE is also used for squeezy bottles and flexible toys.
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