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Elevated Cure Schedules

The Resin Research Epoxy Systems can be used effectively with simple room temperature cure or as an elevated temperature system providing for very high quality, structurally superior composites. Elevated cure cycles give this system higher Tg and HDT through higher crosslink density. Superior to room temperature curing this also gives the best toughness to modulus ratios.

 

All our systems are based on very new epoxy/cycloaliphatic resin/hardener technology which gives better adhesion and inter-laminate wetting characteristics within the individual fabric fiber bundles. This provides for high strength to weight composites with superior heat stability, excellent resistance to fatigue along with excellent toughness and moisture exclusion properties. Through this chemistry and the effective technique of post curing, the ability of composites to withstand cyclic loading in harsh environments is enhanced.

 

Because of the nature of this system, the processing of the Resin Research Epoxy materials matrix allows for broad range of techniques. The myriad of resins and hardeners available allow for numerous qualities to be obtained through a materials selection with many processing choices. This allows for all processes including wet lay up, contact molding, vacuum bagging, infusion, etc. to be fine tuned to exacting standard of quality where cycle times can be maximized.

Typically most shops B-Stage. In other words let the composite gel at room temperature and then add heat to finish the cure. The advantage to this is that nothing will likely move during the elevated cure. It also can reduce the chance of print through. Below are examples of B-Stage elevated cure schedules for Resin Research Systems.

 

    Product Combination                          Initial Cure                                 Post Cure

 

All Composite Pro and                          3 hrs. @ 72F               3 hrs @ 110F or 1 hrs @ 180F

Project 21 resins cured

with Fast hardeners                                           

 

All Composite Pro and                          6 hrs @ 72F               4 hrs @ 110F or 1.5 hrs @ 180F

Project 21 resins cured

with Slow hardeners 

All Composite Pro and                         16 hrs@ 80F               8 hrs @ 110F or 2 hrs @ 180F

Project 21 resins cured

with Xtra Slow hardeners 

           

Direct curing the resin from a wet state is also possible. This provides for very fast cycle times and can be used in many open and closed mold processes. Below are examples of direct elevated temperature curing schedules.   

   Product Combination                                                   Direct Cure Schedule

 

All Composite Pro and                                 4 hrs @ 110F or 2 hours @ 140F or  1 hr @ 180F

Project 21 resins cured

with Fast hardeners                                           

 

All Composite Pro and                                5 hrs @ 110F or 2.5 hrs. @ 140F or 1 hr @ 180F

Project 21 resins cured

with Slow hardeners 

All Composite Pro and                               8 hrs @ 110F or 3 hrs. @ 140F or 1.5 hrs @ 180F

Project 21 resins cured

with Xtra Slow hardeners 

 

Pre-preg Curing - The Resin Research Pre-preg System is a bit different than most prepress. This system will cure at room temperature but is extremely slow at doing so. This gives plenty of time (approx. 4'6 hrs. for PPX and 8 to 12 hrs. for PPU) to impregnate your fabrics either on a wet out table or using an impregnator and get them into a freezer. The fact that these will cure at room temperature ensures that no mater what might happen you'll still have a finished product at the end. Generally pre-preg is direct cured mostly under vacuum but regardless of weather its vacuumed of open mold these cure schedules below are applicable. 

   Product Combination                                                            Direct Cure Schedule

 

Pre-preg Resin with Hardener PPX                  8 hrs @ 110F or 3 hours @ 140F or  1.5 hr @ 180F

                                         

 

Pre-preg Resin with Hardener PPU                 12 hrs @ 110F or 4 hours @ 140F or  2 hr @ 180F