A stealth aircraft is designed to be as invisible as possible to radar, so that it can evade detection by enemy radar systems. A good material for a stealth aircraft to be built from would be one that has a low radar cross section (RCS), meaning that it absorbs and scatters radar signals to a minimal extent.

Materials with low RCS include composites made of fiber-reinforced plastics and carbon fiber, as well as materials that are highly conductive, such as metals like aluminum and titanium. These materials can be shaped into complex geometries that minimize the amount of radar reflection and maximize the amount of absorption.

In addition to the material itself, the design of the stealth aircraft also plays a significant role in its radar invisibility. The aircraft should be designed to have a shape that minimizes the reflection of radar signals, and any sharp edges or protrusions should be avoided.

It's worth noting that there is no single material or design that can completely eliminate a stealth aircraft's RCS. Instead, the combination of materials and design elements can be optimized to reduce the RCS as much as possible.
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