How can I get freshly powdered KOH from commercially bought KOH pallets?

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Chao Feng

You can buy it from Sigma-Aldrich:http://www.sigmaaldrich.com/catalog/product/sigald/06103?lang=en®ion=US

or you can powder it inside glovebox; another choice would be put it in acetone or DCM and crash KOH pellets inside these solvents and then filtration to obtain fine powder.

Or...use a plastic bag to cover everything inside, flash the bag with argon or nitrogen, seal the bag, and you can still ground the KOH pellets. Many methods you can try...