The polarity of the solute is crucial for the choice of stationary compound, which in an optimal case would have a similar polarity than the solute.
dot-red GC columns are available in High, Low and intermediate polarities.
Common dot-red stationary phases include Methyl siloxane, Methyl polysiloxane, Cyanpropyl, phenyl, Polyethylene glycol (wax) and Cyanpropyl polysiloxane.
For an overview of GC Capillary Columns please see here
100% Methyl siloxane
DR-1 phase is a 100% Methyl siloxane phase for GC columns.
DR-1 phase is Low Polarity
DR-1 phase GC columns are equivalent to:
Agilent/J&W: DB-1, HP-1
Alltech (Grace): AT-1
Phenomenex: ZB-1
Quadrex: 007-1
Restek: Rtx-1
SGE: BP-1
Supelco:SPB-1
Varian: CP-Sil 5CB