Perform your liquid-liquid extractions with these chemically inert, translucent and autoclavable Thermo Scientific™ Nalgene™ Separatory Funnels made with Teflon™ fluoropolymer and Closure made with Tefzel™ which feature a TFE stopcock assembly. TFE stopcock assembly has excellent chemical resistance, is leakproof† when used with provided Nalgene closure and does not require lubrication — can be chemically disinfected. More transparent than our polypropylene separatory funnels. Compatible with all common lab reagents and solvents. Won't chip, crack or shatter like glass separatory funnels.