What is prepreg?

What is prepreg?

• A. A type of weaving technique
• B. Fibers pre-impregnated with resin before layup
• C. A hardening agent added after layup
• D. A measurement unit for resin content

Answer: (B)

Prepreg refers to fibers that have resin already impregnated into them before layup. The resin system is applied to the fibers and partially cured so the material is tacky and easy to handle, allowing precise fiber placement and consistent resin distribution. Because resin is already in place, parts produced with prepregs are cured under heat and pressure, often in an autoclave, to fully cure and achieve desired properties. They must be stored cold to prevent full cure until processing. The term prepreg isn’t a weaving technique, it isn’t a hardening agent added after layup, and it isn’t a measurement unit for resin content.

Prepreg refers to fibers that have resin already impregnated into them before layup. The resin system is applied to the fibers and partially cured so the material is tacky and easy to handle, allowing precise fiber placement and consistent resin distribution. Because resin is already in place, parts produced with prepregs are cured under heat and pressure, often in an autoclave, to fully cure and achieve desired properties. They must be stored cold to prevent full cure until processing. The term prepreg isn’t a weaving technique, it isn’t a hardening agent added after layup, and it isn’t a measurement unit for resin content.