ESTCI, 1/8", 1 LB, Noma Cast, Hard Cast Iron Electrode, Non-Machinable Cast Iron Specialty Welding Electrodes Feature A Non-Conductive Coating That Is Specially Developed For Welding Dirty, Heat Affected & Oxidized Cast Iron, Ideally Suited To Cladding Contaminated Casting Prior To Joining With High Nickel Alloys, Non-Machinable, Typical Applications Include Machine Bases, Pedestals, Frames & Housings Where Heat & Machinability Are Not An Important Factor.