It is macromolecule multicellular ball used forGaseous phase.Analysis.  The main character is the retention of the water on the fixed phase is very little. The peak form is sharp andsymmetric.

It can test the water in the organic compound and inorganic compound conveniently and swiftly. 

 

It can also separate various of gas and organic compound, eg: alcohol, aldehyde, ketone, acid, ester, paraffin, olefin hydrocarbon, arene and their homolog. The order of the separation depends on the different boiling points and polarities of the matters.