FRP is commonly used for industrial case applications, including instrument cases, due to its excellent strength to weight ratio, impact and corrosion resistance, relatively low tooling cost and ability to be molded while incorporating inserts, bosses and color throughout the part, often eliminating some secondary operations. The instrument case shown at the right is one of more than 100 specialty cases produced for Pringle Electric Co. The cases were manufactured from Class 1 fire retardant polyester resin and fiberglass. All attachment hardware is stainless steel.. Cases may be manufactured in a variety of configurations to fit any number of needs. Two examples are shown left and below. The Mil-Spec battery case on the left incorporates extra heavy wall sections and bosses in a resin transfer molded housing to meet the required mechanical loads. The wire shown is for an integrally molded heater cable. The case below incorporates a custom geometry to meet its performanceneeds.