Iron(II) sulfide or ferrous sulfide (Br.E. sulphide) is a chemical compound with the formula FeS. In the oil/gas industry, iron sulfides are often present in a sour system due to reaction between corrosion products and hydrogen sulfide.
A material that conducts (see conduction) electricity poorly or not at all. If a voltage is applied to a dielectric, the atoms in the material arrange themselves in such a way as to oppose the flow of electric current. Glass, wood, and plastic are common dielectrics. (See insulator.)
The dielectric strength is given by the potential gradient necessary to cause breakdown of an insulator or substance. The standard unit of Dielectric Strength is Volt per Meter (V/M), a unit which is mostly used is kilo Volt per millimeter (kV/mm). Dielectric Strength of Air: