Explain this Powder

Ganderite said:
I don't know. I was surprised to see them use water to bring the powder to the correct speed. Obviously water will dry out if and when a powder is not in a sealed container. This is why I decant 8 pounders to sealed one pound cans.
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So with the plastic 8 pound jugs and screw on top we have now do you think that the powder drying out is as big a problem? I have bought Bullseye in the cardboard 8 pound cannisters before and I can see how that could dry out easily.
 
I save my emplied plastic propellant containers, carefully label them and transfer polybagged, cardboard boxed propellant to them.
That is a more convenient dispensing system and will minimize moisture shift in the propellant.
 
I guess the big problem with most packaging is that it is low density poly which is vapour porous. Same reason you get [SIZE=-1]freezer [/SIZE]burn on food in poly bags.
 
kg said:
Got time to think about it: I seem to remember claims about ball powders (all double base) being moisture insensitive...
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When you said 'double base" I was thinking of RL-15 type extruded powders.

Ball powders are structurally somewhat different. I don't know if they dry out or not, but if an authoritative source said they are moisture insensitive, I would accept it.
 
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