RTM stands for Resin Transfer Molding and is characterized by resin being injected into a closed mold containing a dry fiber preform and cured under pressure. Which option best matches this statement?

• A. Resin Transfer Molding; resin is injected into a dry fiber preform inside a closed mold and cured under pressure.
• B. Resin Transfer Molding; resin is injected into a dry fiber preform in an open mold at ambient pressure.
• C. Resin Transfer Method; resin is injected into a wet layup in a closed mold.
• D. Reactive Transfer Molding; resin cures before injection.

Answer: (A)

RTM is defined by injecting resin into a closed mold containing a dry fiber preform and curing under pressure. The description in the chosen option matches this exactly: resin transfer molding where resin is introduced into a dry preform inside a closed mold and cured under pressure.

The other statements stray from RTM in key ways. One uses an open mold and ambient pressure, which misses the closed-mold, pressure-assisted nature of RTM. Another switches to a different name and mentions a wet layup, which contradicts the dry preform requirement. The last one uses a different process name and states curing before injection, which is not how RTM operates.