Material Selection

Question 1

What is material selection?

Answer 1

The properties of materials need to be considered when designing a product
E.g. a steel handle on a cooking pan would conduct too much heat and burn the user

Question 2

What is absorbency( selection criteria when picking a product)?

Answer 2

The ability to soak up water, light or heat
Good products: cotton and paper
Bad products: polystyrene

Question 3

What is density?

Answer 3

How solid a material is
Equation: density= mass/ volume
Dense: lead and oak

Question 4

What is fusibility?

Answer 4

The ability of a material of a material being heated and joined together
Example: weld metal

Question 5

What is an electric conductor?

Answer 5

The ability to conduct electricity
Eg; copper wiring

Question 6

What is thermal conductivity?

Answer 6

The ability to conduct heat
Eg: steel

Question 7

What are other considerations to material selection?

Answer 7

Malleability= how easy to bend eg steel
Toughness= material hard to break or snap eg Kevlar
Strength= the ability of a material to withstand compression and tension eg diamond
Hardness= the ability to withstand impact without damage eg oak
Elasticity= something that can be stretched and return to its original state eg elastane in swimming trunks
Ductilibility= materials that can be stretched eg copper

Question 8

What is paper made from?

Answer 8

Wood pulp

Question 9

What are bleed proof physical and working properties?

Answer 9

Physical properties- white can be textured and thin
Working properties- coated to stop colour seeping, ink stays bright on the surface

Question 10

What are cartridge paper physical and working properties?

Answer 10

Physical- thick,textured and rough
Working- expensive and opaque

Question 11

What are grid paper physical and working properties?

Answer 11

Physical- white paper printed with a variety of grids
Working- lines are usually blue but can be darker to trace through

Question 12

What are layout paper physical and working properties?

Answer 12

Physical- smooth of finish and translucent
Working- takes most media well

Question 13

What are tracing paper physical and working properties?

Answer 13

Physical- translucent and smooth
Working- shiny

Question 14

How is card formed?

Answer 14

In the same way as paper but just thicker

Question 15

What are corrugated card physical and working properties?

Answer 15

Physical- paper bounded on the outside
Working- strong and protective

Question 16

What is board made from?

Answer 16

Much thicker than paper and card and are typically heavier than 220 gsm

Question 17

What are polypropylene physical and working properties?

Answer 17

Physical- thin plastic sheet in a range of colours
Working- strong and flexible and excellent resistance

Question 18

What are duplex board physical and working properties?

Answer 18

Physical- two layers of card are bonded together
Working- stiff and lightweight

Question 19

What are inkjet card physical and working properties?

Answer 19

Physical- bright white and smooth on both sides
Working- deep colours as the photographic ink sits on the surface

Question 20

What is laminated layers?

Answer 20

Paper based boards

Question 21

What are foil based packaging physical and working properties?

Answer 21

Physical- consists of paper based board layer and thin Aluminium foil
Working- easily printed and thin aluminium foil ensures food freshness