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Polyetherimide (PEI), polyethersulfone (PES), and polyvinylchloride (PVC) are representative of transparent amorphous polymeric materials that can be seen easily in daily life. PEI and PES are widely used in many products since they show high thermal, electrical, mechanical, chemical, and flame resistivity. PVC, if it is plasticized, also has good insulating properties, and is used in emulsion and suspension polymerization. Therefore, a broad understanding of these polymers under extreme conditions is essential, but their acoustic behavior at a few GPa has not been reported hitherto.