This high efficiency, low holdup, low pressure drop fractionating column is vacuum jacketed with an observation stripe.

Suitable for samples as small as 2 ml. The center tube is removable for cleaning. Double expansion spiral eliminates choking. Joints are [ST] 14/20. Approximately 40 theoretical plates at 80 ml/hr. boil-up. Operating pressure drop less than 1 mm Hg. Column holdup (approx.): Operating — with a 89074-446 head, 0.6 ml at 80 ml/hr. Static — with a 89074-446 head, 0.25 ml Xylene. Static: Column alone, 0.1 ml Xylene. Fabricated from borosilicate glass.