PD-140C is an acidic crystal compound that is used to make up a working PD-140 solution. It is an important part of the activation of printed circuit boards. PD-140 is supplied either in a dry or liquid form. It is designed to be used prior to the CT-164 activator. It protects the activator solution from contamination and normality imbalance. PD-140 contains a special blend of acidic compounds that help it increase the coating’s deposit energy. It pre-conditions the epoxy fiberglass allowing for the proper absorption of the catalyst solution. PD-140C is supplied as dry salt crystals, which allow for easy make up of the working solution.