Forney Nomacast non-machinable cast iron specialty welding electrodes feature a non-conductive coating that is specially developed for welding dirty, heat-affected and 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 and housings where heat and machinability are not an important factor. Hardness: RC 39. Recommended Polarity: DC Reverse, Straight or AC. Diameter (Inches): 1/8". Weight Lbs. (Kg): 1 (.453). Tensile Strength (PSI): 62,000.