guys, i purchased some potassium chlorate as part of a kit about 5 years ago, it came in a plastic bag in a brown box and was originally powder. i just opened it for the first time and it is hard as rock. any advice on how to break it up. even into smaller pieces that could then be ground into powder? best ways? is it now unusable?
If your oxidizer is caked hard, you can powder it through a sieve.
Place the sieve, screen side up, on a large sheet of paper*; then grate the clump of hardened oxidizer through the metal screen.
Take your time and it should all return to powder as you work it through the screen.
Edit: *Actually I use two sheets of paper for material handling and spill prevention. Also, my preference is to use stainless steel screen, which lasts longer and costs nearly the same as brass screen when purchased in bulk.
Edited by WSM, 03 June 2021 - 07:41 AM.