HPLC bottles hold the mobile phase of high-performance liquid chromatography, often acting as a reservoir for the solvent. The bottles are made from borosilicate glass or highly durable plastics such as Teflon. Special caps prevent particulate matter from contaminating the mobile phase and possible spills. The HPLC bottles are autoclavable with coloured coats or siding that absorbs ultraviolet light to help protect sensitive chemicals housed within the container.