What is a primary cause of excessive porosity in a laminate?

Excessive porosity in a laminate is primarily caused by high-speed or turbulent mixing of resin. When resin components are mixed too rapidly or with excessive turbulence, it can introduce a significant amount of air into the mixture. This air forms bubbles that become trapped within the laminate as it cures. These trapped air bubbles create voids and lead to porosity, which can compromise the overall integrity, strength, and performance of the laminate.

Effective mixing should be done gently to minimize the introduction of air, ensuring a smoother and more cohesive mixture that reduces the likelihood of porosity. Achieving a proper balance in mixing speed is crucial in laminate production to maintain the quality and structural properties desired in composite materials.