Purpose of Matrix:
1. Binds fiber reinforcement and transfers loads between fibers.
2. Gives net shape to composites.
3. Determines surface quality.
Purpose of Reinforcement:
1. Increases overall mechanical characteristics of the matrix.
2. Provides strength and stiffness.
3. Increases coefficient of thermal expansion and conductivity.

Constitute over $90\%$ (by weight) of total composites used in industries.
Advantages: Easy fabrication of complex shapes.
Preparation: Bonding fiber material with resin matrix, then curing under pressure and heat.
Reinforcing Agents: Glass, graphite, alumina, carbon, boron. Forms: short fibers, continuous filaments, woven fabrics.
Resin Matrixes: Polyesters, epoxy, phenolic, silicone, polyamide.
Characteristics: High yield strength, fracture strength, fatigue life. Fiber prevents slip/crack propagation. High corrosion/heat resistance. Properties depend on resin matrix.

Resin Type	Reason
Polyester resin	Good strength and mechanical properties
Epoxy resin	Good mechanical properties
Silicone resins	Excellent thermal and electrical properties
Phenolic resins	Withstand high temperature
Thermoplastics (polyamide, PET)	Repeatability and repairability

Name of FRP	Properties	Applications
Glass - FRP	Lower densities, dielectric constants. Higher tensile strength and impact resistance. Excellent corrosion, chemical resistance, non-flammability.	Automobile parts, storage tanks, plastic pipes, flooring, transportation industries.
Boron - FRP	Excellent stiffness and compressive strength. Difficult to manufacture.	Horizontal and vertical tail in aeroplanes, stiffening spares, ribs.
Carbon - FRP	Lighter density. Excellent resistance to corrosion. Retention of properties at elevated temperatures.	Structural components of aircraft, helicopters, recreational equipment, sports materials, antenna discs, solar panels.
Aramid - FRP	Metal-like ductile, responds non-catastrophically to compressive stresses (due to energy absorption).	Structural component in aircraft, helicopter parts.
Alumina - FRP	Good abrasion resistance, creep resistance, dimensional stability.	Components of engine parts in automobile industry, turbine engine.
Fibre reinforced laminates	High impact protection. Lower smoke/flame spread ability. Strength 13 times higher than rigid vinyl surface.	Increase strength of reinforced concrete and pre-tensioned structures. Controls and prevents cracking in plastic area of members.