A research team has developed a layered polymer composite that shields against electromagnetic interference while remaining strong and tough. Made with bamboo-derived biochar, the material achieved an average shielding effectiveness of 36.7 decibels across the tested frequency range, with absorption accounting for 84% of the reported shielding effectiveness. Its tensile strength reached 25.5 megapascals, and its toughness reached 2.68 megajoules per cubic meter. By combining electromagnetic protection with mechanical performance in a biochar-based material, the design could guide the development of components for electronic devices and other applications that require durable shielding.