What happens if you do not maintain the correct vacuum level during the lay-up?

Maintaining the correct vacuum level during the lay-up process is crucial for the integrity and quality of composite materials. If the vacuum level is not maintained properly, it can lead to defects such as voids, poor bonding, or uneven resin distribution in the final product. These defects compromise the mechanical properties and overall performance of the material, potentially leading to structural failures when the components are subjected to stress.

Proper vacuum levels help ensure that air and moisture are removed from the lay-up, allowing for even resin impregnation and facilitating optimal curing. When the vacuum isn't adequate, it can prevent these conditions from being achieved, resulting in compromised quality and performance. Hence, the correct answer highlights the significance of vacuum maintenance in achieving a defect-free composite product.