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ROMIL Hi-Dry® Anhydrous Solvents |
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ROMIL Hi-Dry® Anhydrous Solvents |
Looking for the Driest Solvents ?
Laboratory techniques make regular use of anhydrous solvents, especially in analysis and synthesis. But to purify and dispense them brings many difficulties. To address this need we have taken further the high purity concept of our famous ROMIL-SpS Super Purity Solvents. A range of specially dried solvents with such low water levels that surpass even the so-called anhydrous offerings from rivals. In general ROMIL Hi-Dry® anhydrous solvents are specially produced to a water specification of less than 50 ppm (<0.0050%). However, many solvents go well beyond that and are routinely produced to lower than 5 ppm (<0.0005%). Solvents this dry need a packaging system designed to ensure that the exceptional state of dryness achieved at time of purification is retained throughout storage and use. Before filling, we first oven-dry the amber glass bottles to remove all traces of water which may be present on the inner walls. At such low levels even this trace moisture is noticeable. The bottles are then filled under an inert atmosphere of dry nitrogen to prevent moisture build-up and sealed with a special cap.
Specially designed both to retain solvent dryness and purity and to facilitate dispensing, the Hi-Dry® cap features a double seal; a PTFE wad and a self-sealing septum. The PTFE wad sits between the solvent and the septum thereby maintaining the original chemical purity and giving an extended shelf life before initial use. The self-sealing septum allows the solvent to be dispensed by syringe at the point of use but because the cap itself is screw-on it may also be opened conventionally. However, it is important to note that once in contact with the atmosphere product quality can deteriorate depending on the hygroscopic nature of the solvent. To overcome this we recommend that dispensing operations are conducted under dry nitrogen either in a dry cabinet or with a positive pressure of the gas within the bottle. For safety reasons this should not exceed 0.3 bar (0.31 kg/sq cm) and should only be undertaken by personnel trained in such techniques and wearing appropriate safety equipment. Click here to view specifications and discover just how dry ROMIL Hi-Dry® solvents really are! (Or click here to view ROMIL Hi-Dry® KF Reagents & Calibrants if it's water that you are actually searching for!)
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