ecos - 18-3-2014 at 09:33
Hi All,
regarding the effect of aging on NG/NC mixture : file
the results are strange from my point of view, it say the sensitivity decrease by time !
below are picture for the mixture with different time periods
is the bubbles due to impurities in the used materials? or they came from NC in mixing process with NG?
[Edited on 18-3-2014 by ecos]
[Edited on 18-3-2014 by ecos]
[Edited on 18-3-2014 by ecos]
Fantasma4500 - 18-3-2014 at 10:11
i recall hearing that NC quality in nitrating acid will degrade if left in the mix for more than 24 hours, perhaps acidic residue in the NC will do
the same with NG aswell as the NC itself and thus decrease quality?
its quite hard to wash NC quite well, having tried it myself with (conc) NaHCO3 solution boiling for several hours ended up with a superfine fibre
powder of NC with somewhat poor burn speed, but it was a powder, although
ecos - 18-3-2014 at 11:02
i think this might also be the reason why NG/NC mixture loses its power with time !
Metacelsus - 18-3-2014 at 13:03
Why is it orange?
packetforger - 18-3-2014 at 15:05
Orange is a sign of decomposition... However.
NG/NC gels lose sensitivity over time because small air pockets in them go away. Often, old blasting gelatine will not detonate properly, and it was
commonplace to "roll it around a bit" to reintroduce those airpockets before use to prevent failed dets.
There is a lengthy explanation for this involving adiabatic heating, but OP should look that up for himself.
ecos - 19-3-2014 at 03:04
I found this patent : https://docs.google.com/viewer?url=patentimages.storage.goog...
it shows how to remove the bubbles from the gel using (1% chalk + 91% NG + 8% NC)
I want to try it but i don't understand why he works at temp = 5 degree !!!!, why didn't he use hot acetone (chalk + NC) then add NG ?