Deep-fryer baskets can be made of stainless steel, nickel-plated or mild steel, or tin. Stainless steel is the most durable and longest lasting material, while mild steel is less expensive and tin is heavier but corrodes easily.
Most deep-fryer baskets are made of stainless steel because the material does not warp or corrode from exposure to the intense heat and moisture of a deep fryer. Most commercial models and many household models use stainless steel. Before stainless steel became widely available, most baskets were electroplated steel or tin. These materials are less expensive but do not last as long as stainless steel.