Utilize these chemically inert, translucent and autoclavable Teflon® FEP Separatory Funnels which feature a TFE stopcock assembly. TFE stopcock assembly has excellent chemical resistance, is leakproof† 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.