Funnels, Cold Addition, Airfree, Schlenk

Used in the preparation of block copolymers or any chemical synthesis requiring high vacuum techniques.  Funnel features a large diameter ring seal between the coolant container and the addition funnel body thereby reducing stress and permitting for  use of a wide range of coolants, from ice-water to liquid nitrogen.  The open cup design of the coolant chamber allows for easy addition of coolant, particularly dry ice chunks, without the annoying "blow-back" associated with other funnel designs.    Constructed using grease-free 0-4mm Chem-Vac™ Chem-Cap® valves on the pressure equalizing arm and lower inner joint.  Positioning of the valves permits the funnel contents to be kept under inert conditions prior to use or during loading.  A 14/20 outer joint is sealed on the funnel body just above the coolant chamber for use with CG-3022 or CG-3024 septum stoppers for syringe sampling of the funnel contents.  Funnel has a drain tube on the rear of the coolant chamber.