QLA UltraCentre Precision Dissolution Vessel, Clear Glass, 1000ml, Hanson Compatible - ASTM900-UN_H

• Manufactured from high quality borosilicate glass offering good thermal conductivity
• All QLA vessels are serialised to ensure that you can put the same basket back in the same position and gain enhanced reproducibility

Key Considerations

Glass Vessels benefit from good thermal conductivity (it is often necessary to have the temperature of the water bath as much as 2°C higher than the analysis temperature when using plastic vessels). Another advantage of using glass vessels is their high resistance to scratching, which means they have to be replaced less frequently.

Amber Vessels can be used if light sensitive compounds are being tested. They are available in glass and plastic.

Plastic Vessels can be used in place of glass where appropriate. The plastic must not interfere with the analysis by sorbing, leaching or reacting with the analyte. Typically styrene acrylonitrile is used. Plastic vessels have the advantage over glass in that they are very reproducible – the vessel is made from a mould rather than hand-formed. This reduces possible errors in setting the paddle height and centering and can give very reproducible results. Another advantage of plastic vessels is that they have feet so they can stand upright independently. The biggest disadvantage is that plastic is very prone to scratching and cracking, requiring frequent replacement.

Peak Vessels are designed to prevent cone formation at the base of the vessel. An undesirable poorly stirred cone shaped region can develop under the paddle during USP Apparatus 2 dissolution tests. Peak vessels have a cone shape moulded into the bottom of the vessel that improves the hydrodynamics around the dosage form and leads to more reproducible dissolution rates. The peak effectively displaces the unstirred cone, forcing the material tested into the region of appropriate hydrodynamics, where all surfaces of the dosage are constantly and uniformly exposed to the moving medium. Peak vessels do not comply with USP specifications and cannot be substituted in existing applications.

Technical Information