Elastomers & composites

How many tires are discarded every year worldwide?

• 1 million

• 0.5 billion

• 1 billion

• 1.5 billion

How many times would this pile of tires wind around the globe?

Assume a tire height of 25 cm

• 2

• 5

• 7

• 9

Where does natural rubber come from?

• Chemical factory, but made of bio-materials

• Extracted from the roots of plants

• Tapped from trees

• Fermentation of plants

What is the ratio of natural rubber vs. synthetic rubber used in the rubber industry?

• 1 : 10

• 5 : 10

• 9 : 10

• 20 : 10

Which type of transportation does not rely on rubber?

• Road

• Marine

• Air

• Walking

How much lighter is a thermoplastic composite block compared to steel?

• 1 time

• 5 times

• 10 times

• 100 times

What are current challenges related to the recycling of thermoplastic composites?

• There is no material to be recycled

• The properties of the material are worse than before

• There are no challenges

• The fibers dissolve in the recycling process

How much of the material of an airplane is from composite?

• 10%

• 30%

• 50%

• 70%

Two statements: are they right or wrong?

I. Energy needed for composite manufacturing is larger than that of metals.  

II. The use of composite materials reduces energy consumption in transportation. 

• Both statements are correct

• I is correct, II is incorrect

• II is correct, I is incorrect

• Both statements are false

How thin are carbon fibers?

Thinner than:

• Human hair

• Fishing wire

• Spider-web fibres

• Bacteria