Carbon composites have many useful properties, with new potential uses being discovered all the time. Researchers have developed a thin sheet variety to exploit its electromagnetic properties for microwave shielding.
The unusual properties of high-surface-area carbons provide a tremendous opportunity for scientists to make composites with useful electrical and electromagnetic properties. Carbon composites are particularly useful as low-weight and ultra-thin electromagnetic shielding.
Further details: Thin carbon sheets for shielding against microwaves