Ultra-Ware® reservoirs have been specially designed for the preparation, storage and delivery of all liquid chromatography mobile phases. The conical bottom reservoirs deliver virtually all of the mobile phase without dangerous reservoir tilting. Reservoirs with side necks allow addition of filtered solvent without removing the delivery cap. All Ultra-Ware reservoirs are supplied with GL 45-4 screw thread. Each reservoir is manufactured from the most chemically inert glass available to prevent the leaching of any extractables into the mobile phase solvents. They are then externally coated with a safety plastic with an added ultraviolet (UV) blocking agent. In case of an accident, the plastic safety coating helps retain glass fragments and allows a reasonable amount of time for the safe disposal of the liquid contents. The plastic coating also blocks virtually all UV light up to 385 nm, preventing photo-degradation of light sensitive reagents. Recommended for use under vacuum for filtration and vacuum degassing of mobile phase solvents. These reservoirs can also be used at internal pressures up to 6 psig for helium sparging and blanketing of the mobile phase.