The non-polar 007-1 dimethylpolysiloxane phase, which separates compounds according to boiling point, is probably the most frequently used phase type in GC.

007-1 PHATTM Phase Columns
In addition to the standard range of column configurations offered with the 007-1 phase type, our unique coating technology allows us to extend the functional range of columns coated with the 007-1 phase by the application of very thick films.  For example, films up to 3.5 microns on 0.10mm I.D. fused silica and 18.0 microns on 0.53mm I.D.