Chromatography Forum

I have a Supelpak-S (18' packed) x 1/8" OD fitted in a HP 7890A. I want to condition the column, but I noticed that my pre-column rate is 30 mL/min and my post-column flow rate is 10 mL/min. Will conditioning the column fix this - and is 10 mL/min an OK flow rate if I bake it overnight at 150oC?

I have another spare packed column - Chromasil 330, not yet preconditioned and I notice the same drop in flow rate. My guess is that this decrease is a feature of non-conditioned columns, but I thought it was worth to check this, before conditioning.

All answers appreciated.

You should call Supelco technical service. You will get the correct answer and the call is free.

800-359-3041

My guess is that you have a serious leak in your instrument. If you do then conditioning the column at 150°C can damage it. DON'T DO IT. Give Supelco a call first.

best wishes,

Rod