SHIM-PACK VP-ODS COLUMN 250MMX4.6MM Works With Columns Each Shim-pack VP-ODS Column is supported by a Comprehensive Performance Validation Package which includes a Physical Properties Certificate of Compliance,a Chromatographic Performance Certificate of Compliance and a Shim-pack Column Performance Report. Silica particles of uniform size distribution provide more rugged column performance and reduced column operating pressure. Low metal content and efficient end-capping result in excellent peak shapes,even for acidic,basic,or chelating compounds.