This action finalizes the residual risk and technology review (RTR) conducted for the Friction Materials Manufacturing Facilities source category regulated under national emission standards for hazardous air pollutants (NESHAP). In addition, we are taking final action addressing periods of startup, shutdown, and malfunction (SSM). We are finalizing our proposed determination that the risks from the category are acceptable and that the current NESHAP provides an ample margin of safety to protect public health. We identified no new cost- effective controls under the technology review to achieve further emissions reductions. These final amendments include amendments to revise reporting requirements for deviations. These amendments are made under the authority of the Clean Air Act (CAA) and will improve the effectiveness of the rule. The amendments are environmentally neutral.