About Addenda

Addenda, established in 1999 and headquartered in Indianapolis, Indiana, USA, specializes in the development and manufacturing of specialty additives for plastics, rubber, batteries, and industrial applications. The company provides functional additive solutions designed to improve material performance, processing characteristics, and end-use properties. Its portfolio includes plastic additives, stabilizing systems, and specialty chemical solutions for polymer and energy-related applications. With a focus on innovation, quality manufacturing, and customer-specific solutions, Addenda supports formulators and manufacturers in developing advanced materials with enhanced performance and reliability.