These 45mm diameter PYREX® coarse porosity (40 to 60µm) fritted thimbles are designed for use in PYREX® Soxhlet extractors when it is desirable to weigh the material extracted or where paper thimbles may be attacked by the chemicals used. These medium length thimbles are 130mm long. For PYREX® extractors and extraction apparatus, see Nos. 3740 through 3880.