GCM epoxy prepregs, Ep-preg®, are especially formulated from advanced epoxy resins. The following table presents the prepregs currently available with their respective properties:
 
Typical Ep-preg® Properties

S153

F64-A1

S323

S433
         
Out life @ 20 - 23°C (weeks) 15-16 15-16 6-7 4-5
Storage life @ -18°C (months) 24 24 12 12
Cured resin density (g/cm3) 1.16 1.36 1.10 - 1.15 1.10 - 1.15
Gel time - Hot plate (min)        

@ 80°C

 - - 210-240 210-240

@ 90°C

 - 15-17 - 60-100

@ 100°C

 - 7-9 40-60 25-35

@ 110°C

 13-15 3-5 17-25 20-26

@ 120°C

 7-9 2-3 6-10 6-9

Neat resin Tg - DSC, 10 °C/min - (°C)

        

10 hrs @ 70°C

 - - 45-53 -

10 hrs @ 70°C + 4 hrs @ 80°C

 - - 82-88 -

8 hrs @ 80°C

 - 69-75 69-75 -

16 hrs @ 80°C

 - 89-95 89-95 -

4 hrs @ 90°C

 95-100 95-100 84-90 -

6 hrs @ 90°C

 - 105-110 99-105 -

4 hrs @ 100°C

 - - - 117-123

6 hrs @ 100°C

 110-115 113-117 113-119 121-127

2 hrs @ 110°C

 - - - 122-128

2 hrs @ 120°C

 110-115 113-117 117-123 126-132

   Self Extinguishing

 No Yes No No