flash powder

[Hunter]

Were you not aware of them? I pointed it out ages ago. Not all aluminium powder is green. German dark aluminium powder gets the greenish tinge from graphite being added, and it being charred in an inert atmosphere.

[nme]

Were you not aware of them? I pointed it out ages ago.

huh.. Can't remember you doing so. herm. They've a load of balls in them also so as to erase when you shake. meh.
Well they usually don't exactly add graphite. Its ends up being in there as a remnant from charring the foil. But ya basically twas described as a an incredibly fine powder (compared to icing sugar) that ya, had a green-ish tinge. Such as high-mesh Al I've seen in the past.)
Aluminium carbide is often also added to lower ignition temp. It has a yellow to brownish color, also affecting the overall appearance.
Just for anyone that's interested: Bright flake Al is Al that has been coated to prevent it from oxidizing (Perhaps somewhat more reactive. While Dark flake has no coating and thus is protected (Often decreasing performance) by its oxide layer.

[delusional_reality]

I get my Al from etch-a-sketch boards and aluminium paint.

[Pyrostar]

Hi

Is it normal that he aluminium powder and the flashpowder made with it does clump very much?

I mean it forms small balls every time.
I use the KClO4/Al one.
is there a chance that the KClO4 became wet?
The KClO4 is fine, I would say 500 mesh, technical gerinded I think
I have german dark Al, dunno the mesh size.

Pyrostar

[nme]

Clump. How odd. I guess moisture must be getting in there somehow Perhaps the Al? (Tis a lot harder to tell when a fine metal is wet.) You should know if the KClO4 is wet as it will probably just clump on its own.

[delusional_reality]

200 mesh Al powder in ''radiator resin filler'' for fixing holes in car radiators.