Effectively perform organic solvent and concentrated oxidizing agent work with Thermo Scientific™ Nalgene™ Erlenmeyer Flasks made with Teflon™ fluoropolymer and Closure made with Tefzel™, which are unbreakable, autoclavable, nearly transparent and resist virtually all chemicals. Combine the excellent chemical resistance of FEP with the convenience of a screw closure. These flasks can be a valuble element of lab safety programs.