Instructables

My Flash Powder won't Flash. Potassium Perchlorate and Aluminum Powder. Whats wrong?

I mixed Potassium Perchlorate and Aluminum Powder and all it did was ball up.

Berkin5 years ago
You should be using very finely ground chemicals, and a 30/70 ratio of aluminum to perchlorate. This will give you the best results. Also, make sure your chemicals are moisture-free. That might explain why it clumped up when you mixed them.
Tombini5 years ago
The things that would alter reaction rate in this case are concentration, particle size and stoichometric ratio; -make sure you use a common and well known ratio -try to make the particle size of both the KClO4 and Al as small as possible (this increases surface area) -and check the quality of your chemicles, they might be less than 80%!
lemonie5 years ago
What proportions, which recipe were you following? L