Manufacturing of Composites

A: Osmotic blistering fits the wet–dry salt exposure and the absence of a barrier coat; water diffusion through the resin is the slow burn here. UV damage sounds convincing because there's no topcoat, but the part isn't sun-facing in service. Galvanic corrosion gets brought up whenever metal inserts show up, yet glass fibers don't close that electrochemical loop. Thermal oxidation shows up in hot ducts and exhausts; 40°C seawater doesn't push that mechanism.

A: Low bath level ties directly to wet-out quality, so dry fibers and voids stay in play, and cure properties can drift if the resin pick-up changes. Vapor concentration feels related because it's resin, but styrene exposure is handled by ventilation and enclosure design, not by a level switch on the bath.

A: Low closing force lets the charge flow unevenly, giving thickness variation and waviness, and it starves fiber volume where the mold gaps. Short fibers would hit strength but not thickness uniformity. Too much release causes surface defects, not bulk strength loss. Overheating the cure shifts properties but usually leaves thickness alone.

A: Vacuum leaks kill RTM parts fast, so integrity comes first, followed by resin condition, then controls. Pressure tuning before knowing vacuum stability puts you backwards. Heating and injecting before leak checks risks scrap and cleanup. Solvent runs have their place, but not two hours before first resin with no baseline checks.