The polypropylene TORAST-H Bio Vial has a special surface treatment that prevents hydrophobic and ionic adsorption onto the surface of the vial. Recommended for low concentration and low-volume samples, especially peptides and basic compounds. Includes caps with PTFE/silicone septa. Includes PP caps with a PP membrane for the autosampler needle target. Since there is not a silicone septum, the cap is suitable for a single injection only and is NOT resealable.G30001