In a composite material, what is the function of the matrix or binder?

The matrix or binder in a composite material plays a crucial role by surrounding and binding the fibres or fragments together. This function is integral to the overall integrity and performance of the composite, as it helps to hold the individual components in their proper positions while distributing loads among them during use.

By efficiently binding the reinforcing fibres or particles, the matrix ensures that the strength and other desired properties of the reinforcing materials are effectively utilized, contributing to the composite's overall characteristics, such as improved strength, durability, and resistance to environmental factors. This position as a binding agent is foundational to how composites achieve a combination of properties that are often superior to those of the individual components alone.