Restek GC Column Selection Guide

Film thickness Effects

A sample containing low boiling components shows the differences in resolution between 0.25, 1.0, and 5.0�m columns. The 1.0�m offers better resolution than the 0.25�m and the 5.0�m does not offer any further improvements for compounds eluting after C6.

30m, 0.32mm ID Rtx-1, 70�C isothermal

0.25�m, Rtx®-1 1.0�m, Rtx®-1

5.0�m, Rtx®-1

butanol
benzene
2-pentanone
C7
1-nitropropane
pyridine
C8
C9
C10

(Peak 9 elutes @ 117 minutes on the 5.0�m)