General Description: Graphitized Non-Porous Carbon. Retention Mechanism: Reversed-phase.. Surface area: 100m2/g; Particle Sz.:120/400 mesh. Extreme affinity for organic polar and non-polar compounds from both non-polar and polar matrices when used under reversed-phase conditions. Carbon surface comprised of hexagonal ring structures, interconnected and layered into graphitic sheets. Non-porous nature of the carbon phase allows for rapid processing, adsorption does not require analyte dispersion into solid phase pores. Independent investigators have found ENVI-Carb extremely useful for the rapid sample preparation of over 200 pesticides from various matrices including ground water, fruits and vegetable. Sigma-Aldrich 57092 Supelclean ENVI-Carb SPE Tube, 250 mg Bed Weight, 6mL Capacity, Pack of 30. Country of Origin : United States. Part Number : 1181F21PK. Pack of : 30.