If you're looking for a casting resin with robust electrical, elasticity, and flame-retardant properties, LOCTITE^® CR 6127 is a great pick. This 2-part, urethane-based resin used for filling, coating, and casting adheres well to pretreated metals and plastics and is a particularly fit for use in telecommunication components, transformers, and other electronic devices. It also contains flame-retardant additives to limit ignition and smoke generation.