SK-3989 is a plastic resin designed by RCA specifically for electronic parts like capacitors, resistors, and diodes. It is composed of polyethylene and has a variety of properties that make it an excellent choice for use in these components. SK-3989 has excellent dielectric strength and excellent physical and chemical resistance. It also has good abrasion, chemical, and moisture resistance, and very low outgassing. Additionally, it provides a good thermal resistance and is unaffected by many common solvents, acids, alkalis, and fuels. SK-3989 is used in automotive, computer, and industrial electronics.