Capillary injector port liners are a critical part of the capillary column system.  They provide a clean, non-adsorptive injection zone which should be replaced regularly to avoid contamination from non-volatiles which can be deposited onto the capillary column.  All injection port liners produced from precision borosilicate glass (quartz where noted) and are polysiloxane deactivated and ready for use. They are manufactured to exacting tolerances and come in various configurations for many popular GCs. Guaranteed inert for phenols, organic acids and bases.