These Griffin beakers molded from PFA, made with Teflon®* Resin, are tough and nearly transparent. Unaffected by all known chemicals except molten alkali metals, concentrated perchloric acid, certain complex halogenated compounds and fluorine at elevated temperatures. Temp. from -270°C to 205°C. Autoclavable. *Teflon® is a registered trademark of E.I. du Pont de Nemours and Company.