What is the matrix in a composite material?

The matrix in a composite material refers to the surrounding material that binds the reinforcement. In composite materials, the matrix serves several important functions. It holds the reinforcement material in place, provides shape and structure to the overall composite, and transfers stress between the reinforcing fibers or particles during application. The matrix material is critical in determining the properties of the composite, including its strength, durability, and resistance to environmental factors.

Reinforcement material, on the other hand, is typically the stronger component, such as fibers or particles, which provides enhanced strength and stiffness to the composite. Heat-resistant layers and outer coatings may play roles in specific applications, but they do not define the matrix within the context of composite materials.