DYKEM® High Purity markers are your answer for marking on stainless steel or any surface where degradation, contamination or other adverse effects are a concern. The formulas contain trace amounts of halogens, low melting metals and are low in chlorides. The precise formulations meet or exceed the specifications for GE Nuclear Energy, GE Aircraft Engines and the US Energy Research and Development Administration (nuclear grade). High Purity 44: Designed with a valve action mechanism that allows the marker tip to be re-inked, even when the cap is left off. Marker barrel is threaded so it can be secured in a jig or apparatus for continuous marking applications. Unique cap design features a clip that prevents the marker from rolling and can easily be secured to a clip board or in your pocket.