Standard Cellulose Extraction Thimbles
Thimbles of type 603 are made from high-quality cellulose. For all automated extraction apparatus in common use, Whatman offers thimbles whose dimensions are matched exactly to those of the thimble holders to guarantee perfect fit. These thimbles can be used to a maximum temperature of 120°C.
Thimble size selection guide
Thimble sizes should be selected carefully to fit extractors correctly. The different sizes represent the established practice of showing the internal diameter and overall length of the thimble in millimeters. Therefore, an extra allowance for wall thickness should be made when calculating external diameters. The thimble should pass through the narrower end of the upper extractor socket, allowing 1 to 2mm clearance, and be 5 to 10mm above the level of the top of the siphon tube.