New SMA® 9000 series pellet masterbatches are formulated concentrates that are reportedly optimized to improve polyamide performance. The concentrates can be used for extruding and compounding, and are designed to improve the melt strength of post-consumer, post-industrial, and virgin polyamides. Beyond chain extension, they serve as compatibilizers for blends, or dispersants for contaminants, and to improve mechanical performance of the end product.