1. Fibre-reinforced plastic
Composite plastics

2. Fibre-reinforced plastic
For small objects plastics are resistant enough
For bigger objects plastics are too weak
We can use plastics for big objects if we increase their resistance
The best way is adding fibres to the plastics

3. Used polymers Thermosetting resins: Epoxy Vinylester Polyester
Phenol formaldehyde

4. Used fibres Glass Basalt Aramid Carbon
Fibres must be sized (coated with a chemical substance to make sure the fibres will be sticky with the resins).

5. Fibres availability
Mat
Woven
Unidirectional

6. Mould We need a mould with the shape of the object we want build
The surface of the object in direct contact with the mould will be smooth. The other side will be rough
We can choose a female or a male mould

7. Female mould
The outer surface of the object will be smooth

8. Male mould
The inner surface of the object will be smooth

9. Release agent Is used to prevent the object bonding to the mould Wax
Paraffin
Polyvinyl alcohol
Silicone

10. Construction Apply a release agent layer Apply a gel coat layer
Put a layer of fibre when the gel coat polymerizes
Apply the resin using a roller
Repeat the steps 4 & 5 until you get the right thickness
Wait until the resin polymerizes (curing time)
Extract the piece from the mould