The Cast Resin PT is a type of epoxy resin which has a very low viscosity. It is a particularly useful type of epoxy resin thanks to its thin consistency. It must be noted however the thin consistency does increase the overall drying time. Resin casting is a method of plastic casting where a mold is filled with a liquid synthetic resin, which then hardens. CT and PT are both a type of measuring device used to measure currents and voltages. The offered Cast Resin PT is a static device used to step down high voltages to measurable levels.