Poly(L-lactic Acid) CAS 26811-96-1 For Medical And Cosmetic Application Poly-L-lactic Acid PLLA Product Description Poly(L-lactic acid) (PLLA) – CAS 26811-96-1 1. Description Poly(L-lactic acid), commonly abbreviated as PLLA or Poly(L-lactide) , is a semi-crystalline, biocompatible, and biodegradable polyester derived from L-lactic acid or L-lactide . It is a member of the polylactic acid (PLA) family and is widely used in medical, and sustainable material applications.