High-Performance Cellulose Extraction Thimbles
Produced from high-quality alpha cellulose cotton linter and with excellent mechanical strength and retention, Hawach cellulose extraction thimbles have gained a favorable reputation all over the world, as the high purity of the materials ensures reliable and reproducible analytical results.
Operators can choose the right one based on their specific requirements, for instance, the single-thickness thimbles are standard with a wall thickness of approximately 1 mm (10.0 µm nominal particle retention) and the double thickness thimbles are needed when higher retention and increased wet or dry strength, or rigidity is required, with a wall thickness of approximately 2 mm (6.0 µm nominal particle retention).
For the two specifications of the cellulose extraction thimbles, the standard ones are more frequently used. How to select the thimble size is based on the specific requirements to fit extractors correctly. The different dimensions represent established conventions, showing the inner diameter and total length of the thimble in millimeters. As a result, the wall thickness should be considered when calculating the outside diameter. The thimble should pass through the narrower end of the upper suction pipe, leaving a gap of 1-2 mm and 5-10 mm above the top of the siphon.
High-Purity Glass Microfiber Thimbles
manufactured from 100% pure borosilicate glass, Hawach glass microfiber thimbles with high-purity are available for different applications. Completely free of binders or additives, it can be used at temperatures over 120°C and the maximum temperature up to 600°C or when using solvents that are incompatible with cellulose thimbles, say the strong acid. They can also be used in pollution monitoring techniques (0.8 µm nominal particle retention). Typical thickness of 1.7 mm.
To sum up, Hawach offers thimbles whose dimensions are matched exactly to those of the thimble holders to ensure optimal fit and for all automated extraction apparatus in common use.