Extraction Thimble, High-Performance Cellulose, 25mm x 80mm, Single Thickness 25/pk (2800-258)Known for their purity and consistent high quality. Widely used in Soxhlet extraction units, providing a safe, convenient and efficient method of solvent extraction of solids and semi solids. Soxhlet extraction is a widely used technique for the analysis of fats or pesticides in foods and soil materials as well as in many other procedures that involve a solid liquid extraction.