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They are usually optained from leftover wood.
Paper: It is obtained by forming a paste out of plants fibres that are mashed pressed and dried.
Carboard: It is made by compressing several lawyers of paper while it is wet to thicken it and produce a heavier texture.
Cork: is obtained from the bark of the cork oak tree.

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Man-made wood: It enhances the properties of the natural wood and reduces the price.
Plywood: It is formed by an odd number of wood lawers called veneers that are laid on top of each other.
Chipboard: It is obtained from wood chips that are mixed with resin and then pressed. It can be coat with a thin plastic or natural wood to improve its appearence.

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Sensory properties: They are properties related to sense.

Mechanical properties: Hardness: The resistance of a material to be scratched. Toughness: The resistance of a material to be broken. Deformability: Is the ability of a material to be deformed. Ductility: The ability of a material to be scratched into a wire. Malleability: Is the ability of a material to be pressed or rolled into a sheet.

Physical properties: Electrical conductivity: Materials that allow electricity and heat to pass through them. Thermal expansion: Materials with this property grow bigger when their temperatura rises.

Chemical properties: Resistance to rusting.

Enviromental properties: Toxicity recicling and biodegradability.

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We prepare or refine raw materials to prepare natural materials

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When we process raw materials they become processed materials

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They are  materials taken directly from nature

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Properties of wood: They depend on the tipe of wood we are talking of.
Tensile strength: It is good in the longitudinal direction and poor in the transverse direction.
Compressive strength: It is better in the transverse direction than in the longitudinal direction.
Flexural strength: It was very used in the past to make posts beames and constructions of many structures.
Hardness: It depends on the tipe of wood. In general the wood is not very hard and it is easier to work with it. But it is hard enough to be sturdy.
Thoughness: Wood is though so is used in sports squipments like hockey sticks.
Thermal and electrical conductivity: Wood  is a good insulator of heat and electricity so this is the reason why the wood is used to make handless for tools.
Sound conductivity: This is because certain musical instruments are made of wood.
Colour: For each different tipe of wood a different colour (white, yellow, brown, black).
Density: Wood is a light material. It has lower density than water so it floats.