2. 1.Raw materials
Are the basic material from which goods that are
extracted directly from natural objects.
examples: tree,
3. 1.2-Origins of raw materials
It can be classified in 3 groups:
Animal Origin: come from animals:
wool,silk…
Vegetable origin:came from vegetables:
cotton,wood,cork…
Mineral orgin:came
from minerals:
4.
5. 2.1.Physycal and chemical process
-Physical process: Is when a substance changes its
state, for example when a metal melts.
-Chemical process: Is when a substance is
transformed into a different substance with
different characteristics. Ex: petrol transformed
to create some types of platic.
6.
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9.
10. 5.2-Chemical properties
Oxidation: this happens when a material reacts with oxygen in the air or
water. Metals are the most sensitive materials to oxidation.
For prevent rusting are coated to with paint,varnish...
11. 5.3-Ecological properties
*Recyclable:Are materials that can be
reused(Glass,paper,metal…)
*Toxic:These are harmful to the
enviroment(Mercuri,petroleum…
*Biodegradable:There are materials that
descompose naturally and don’t cause damage to
the enviroment
*Renewable: raw materials that can be
