Strong-linked chains running in different directions
They are hard, resistant and very elastic
It is made by mixing sulphur and rubber and heating to 160º
Laterally linked chains and folded over themselves
Heating and cooling process can be repeated many times
They can be formed into different shapes as many times as we want
Made by vulcanisation
Weak molecular chains
When cooled, they cannot be remoulded by applying heat
When heated they become soft
Made from compounds derivated from petroleum
When heated they become soft and can be shaped once
They can be remodeled
