A proprietary synthesis process eliminates residual catalysts that could cause degradation and increase bleed Siltek™-treated stainless steel Nonpolar phase; Crossbond™ dimethyl polysiloxane General-purpose columns for solvent impurities, PCB congeners (e.g., Aroclor mixes), gases, natural gas odorants, sulfur compounds, essential oils, hydrocarbons, semivolatiles, pesticides and oxygenates Temperature range: -60°C to 430°C (-76°F to 806°F) Equivalent to USP G1, G2, G38 phases