Each of the three linkages imparts specific properties to the polymer, such as chemical resistance, temperature resistance and impact strength. Tests have shown PETG to be biologically equivalent to, or better than Type 1 borosilicate glass bottles for cell culture applications. In tests using a wide variety of cell lines, PETG was determined to be non-cytotoxic, and media stored in PETG bottles demonstrated proliferative and morphological characteristics comparable to control media. In fact, the PETG bottles allowed growth of good monolayers directly on the surface of the bottle. PETG can be sterilized with radiation or compatible chemicals but cannot be autoclaved.
Chemical resistance is fair.
A patented process for oxidative coupling of phenolic monomers is used by General Electric in formulating Noryl phenylene oxide-based thermoplastic resins. The basic phenylene oxide structure is shown below. This family of engineering materials is characterized by outstanding dimensional stability at elevated temperatures, broad temperature-use range, outstanding hydrolytic stability, and excellent dielectric properties over a wide range of frequencies and temperatures. These are produced by an amidation of diamines with dibasic acids, or polymerization of amino acids. Nylon is strong and tough.