Multilayer Chemical Containers With PFAS-Free Permeation Barriers

The container wall is divided into multiple functional layers: a fluorinated polyethylene layer (providing solvent barrier), a non-fluorinated polyethylene layer (preventing PFAS generation), and an ethyl vinyl alcohol layer (providing gaseous barrier). Each layer performs a specific function, allowing the system to achieve both barrier performance and environmental safety

The patent uses composite multilayered structures combining fluorinated polyethylene, non-fluorinated polyethylene, and ethyl vinyl alcohol materials. This composite approach allows the container to simultaneously achieve chemical resistance, barrier performance, and PFAS-free manufacturing by leveraging the strengths of each material in the appropriate layer

The multilayered wall structure serves multiple functions simultaneously: chemical resistance, liquid barrier, gaseous barrier, and PFAS prevention. By integrating these functions into a single manufactured component through extrusion and molding processes, the patent achieves comprehensive protection without requiring separate treatment steps

The patent employs a nested multilayered structure where different functional layers are embedded within each other in a specific sequence. The fluorinated polyethylene layer is nested within non-fluorinated polyethylene and ethyl vinyl alcohol layers, creating a compact integrated structure that provides multiple barriers without excessive complexity