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:
marble,clay...
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.
7.
8.
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
regenerated: wool, cotton and wood.
