from 2016 we need to have used up any potassium perclorate we have in storage as on 2nd Mar 2016 it becomes illegal to own it, or we need to obtain an epp license to purchase and hold stock of it.This is because it is listed as an explosives precursor. we should already have an epp license if we wish to purchase it or the seller faces 2yrs in prison. The application costs £39.50 for 3 years. This does not apply to business users . . further info is in licensing for home users of explosive precursors on home office web site.
From the web site info listed substances are
Concentration threshold- hydrogen peroxide:12% w/w
- nitromethane: 30% w/w
- nitric acid: 3% w/w
- sodium chlorate: 40% w/w
- potassium chlorate: 40% w/w
- sodium perchlorate: 40% w/w
- potassium perchlorate: 40% w/w
