Home Resource Center Market & Application Literature, Case Studies Commercial Aerospace & Industrial Components Resistance Welding Equipment Brochures & Data Sheets Resources Come to the Head of the Class (RWMA Class 3) with Materion Brush Performance Alloys’ C17510 The premier alloy for RWMA Class 3 is C17510. C17510 outperforms or matches its competitors in all categories. The result is longer life for your resistance welding equipment where C17510 is used.