or
SGE Capillary GC Column BP20(WAX) 25MX0.53mmIDX2.0um Polyethylene Glycol 20?C to 240/260?C essential oils alcohols free acids fatty acid methyl esters aromatics solvents DB-WAX DB-WAXetr Rtx-Wax HP-Wax Supelcowax-10 AT-Wax CP-Wax 52CB