Rankem GC Solvents that brought forward by us are a kind of dimethyl sulphoxide. Such solutions have the lowest impurity concentration and no repeat analysis due to great batch-to-batch consistency. Being narrow solvent front, these help to get back to a flat base line instantly providing a fine base for analysis. The Rankem GC Solvents are precisely developed and perfectly bottled under nitrogen blanket, and properly sealed with PTFE plug so as to prevent product degradation as well as contamination.