This document summarizes information about polyethylene glycol (PEG) and polylactic acid (PLA). It discusses the properties, manufacturing, applications, and recent research for each polymer. PEG is a polydisperse polymer of ethylene oxide that is highly flexible, hydrophilic, and non-toxic. It finds use in various industries and as a non-toxic solvent for preparing polymeric nanoparticles. PLA is a biodegradable, thermoplastic polyester made from lactic acid. It is used in food packaging, medical devices, and fibers. Recent research has shown that adding aluminum hydroxide and phenol resin can improve the flame retardancy of PLA without affecting its properties.