Dear users,

I'm currently working with multiple epoxy resins, but after curing on ambient temperature, i can't determine which one is A-stage and which one is B-stage, which is very important.
The B-stage epoxy only partially cures and this one needs to be cured a second time to gain full conversion.

Now my question is, how do i determine which one is the B-stage? i have a lot of material all over the place and it isn't really pointing itself out.

Thanks in advance,

Frenk

The easiest way to determine whether a resin is fully cured or not is probably measuring its glass transition temperature, but this is certainly not doable by Joe Average. It's a relative easy and fast analytic procedure when you have the right equipment (which unfortunately costs a lot of money).
https://en.wikipedia.org/wiki/Differential_thermal_analysis
https://en.wikipedia.org/wiki/Differential_scanning_calorimetry

That's why I said just give the part the proper post cure treatment to be on the safe side.

a good way of telling if a part is properly cured is the sound it makes, a fully cured epoxy carbonfiber part will make a ceramic sound, a part that is not properly cured will make a dull sound

Matthieu Libeert
Founder MAT2 Composites X Sports
website: www.mat2composites.com