A high resin content in a laminate can lead to which issue?

A high resin content in a laminate can indeed lead to excessive brittleness. This occurs because when the proportion of resin increases relative to the reinforcement fibers (like glass or carbon fibers), there is a likelihood of reducing the overall strength and toughness of the material. The resin in composites is generally meant to bind the fibers together and provide structural integrity; however, if there is too much resin, it can dominate the characteristics of the composite. Resin does not offer the same tensile strength as the fibers, so excess resin can lead to a matrix that is less able to deform under stress and instead fractures more easily, resulting in a brittle material.

The other options, such as increased flexibility, improved adhesion, and better flow properties, are characteristics that are typically not enhanced by high resin content alone. In fact, while some properties may improve with optimal resin content, excessive resin often detracts from the desired mechanical performance of the laminate, leading to issues commonly associated with brittleness.