The chemical decomposer is one of the machines added by MineChem. The chemical decomposer is used to break down items and chemical compounds into their base elements and/or their base compounds. It requires power supplied either from Universal Electricity (Minecraft 1.6.4 or older), or Thermal Exapnsion (Minecraft 1.7.2 or newer) unless otherwise disabled in the config file. 

When properly powered, it can be used by putting an applicable item or compound on the lone top slot. If successful, the item is broken down and the products put in the bottom slots.