What is one of the main reasons for utilizing fillers when working with composites?

Utilizing fillers when working with composites primarily serves the purpose of sealing laminates and filling voids. This is crucial because gaps or voids can significantly weaken the structural integrity of the composite material. Fillers can be used to ensure a more uniform and complete bonding between layers, which enhances the overall performance and durability of the composite. By effectively filling in these gaps, fillers help to prevent delamination and maintain the strength of the composite structure over its lifespan.

In addition to sealing and filling, fillers can be used to modify other properties of composites, but their primary and most critical role revolves around ensuring a solid, void-free construction.