Agilent J&W Select Silanes is a stabilized trifluoropropyl-methyl polysiloxane phase optimized for analysis mof silanes. The column has a very thick film, resulting in a high capacity and retention for highly volatile silanes. In addition, the low bleed allows the column to perform compositional as well as impurity analyses down to ppm levels, while reducing surface activity so that peak shape is improved. Typical applications include alkylated chlorosilanes at percent levels or trace impurity analysis. Valved, direct, and split/splitless injections are possible.