We no longer use packed GC columns. If you are limited to packed column operation then we will run your sample on a suitable capillary column. You must also include a separate run of a suitable standard by injecting a known amount of compound onto your column. This gives us a rough idea of the size of your component peaks before we begin a run. Packed column users have used methyl stearate but just about anything will do.
Many people use dodecane.
You do not have to submit the solution of the compound, just the GC trace and conditions. Your GC traces must indicate chart speed or retention times and attenuator range. The sample submission form has sections for GC conditions. Near the top of the form are six columns. In the first column you can list the peaks for which you want to see the mass spectrum.