Medium carbon steel is selected for the design because it has a high performance index and low cost. Polytetrafluoroethylene (PTFE) GF1 is selected, despite its high cost, for safety purposes. Wrought Ferritic Stainless Steel is selected because it has a good performance index and good thermal properties. Common hard brick is selected for its low cost, good thermal conduction, and ease of manufacture. Nodular (spheroidal, ductile) Cast Iron is selected for its good performance index and low cost. Low Carbon steel is suitable for designs requiring a material that is low cost, stiff, and strong.