Which material would collect the most grease?

Which material would collect the most grease?

• A. PVC
• B. Stainless Steel
• C. Cast Iron
• D. Bronze

Answer: (C)

Grease retention depends on how rough or porous a surface is. Grease clings to and seeps into tiny pores and crevices, so a rough, porous material will trap more grease. Cast iron has a coarse, porous microstructure from the casting process, providing many little sites for grease to adhere to and become difficult to remove. In contrast, PVC and bronze are smooth and non-porous, and stainless steel—especially when cleaned or polished—offers a slick surface with minimal porosity, so grease sits on top and wipes away more easily. Because of its porosity and rough texture, cast iron will collect and hold more grease than the other materials.

Grease retention depends on how rough or porous a surface is. Grease clings to and seeps into tiny pores and crevices, so a rough, porous material will trap more grease. Cast iron has a coarse, porous microstructure from the casting process, providing many little sites for grease to adhere to and become difficult to remove. In contrast, PVC and bronze are smooth and non-porous, and stainless steel—especially when cleaned or polished—offers a slick surface with minimal porosity, so grease sits on top and wipes away more easily. Because of its porosity and rough texture, cast iron will collect and hold more grease than the other materials.