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Author: Subject: effect of aging on the safety and sensitivity of NG/NC mixtures
ecos
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[*] posted on 18-3-2014 at 09:33
effect of aging on the safety and sensitivity of NG/NC mixtures


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]
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Antiswat
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[*] posted on 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




~25 drops = 1mL @dH2O viscocity - STP
Truth is ever growing - but without context theres barely any such.

https://en.wikipedia.org/wiki/Solubility_table
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ecos
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[*] posted on 18-3-2014 at 11:02


i think this might also be the reason why NG/NC mixture loses its power with time !
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Metacelsus
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[*] posted on 18-3-2014 at 13:03


Why is it orange?



As below, so above.
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packetforger
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[*] posted on 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.
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ecos
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[*] posted on 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 ?
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