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These 30 mL PYREX low form crucibles have 30mm diameter coarse porosity (40 to 60 µm) fritted discs. They are particularly adapted to analytical work where precipitates are dried to constant weight at 110°C. They are also suitable for higher temperatures, in which case it is advisable to heat in an electric furnace. Crucibles should not be subject to sudden temperature changes. In order to avoid strain, they should not be removed from the furnace until the temperature has dropped to 250°C. PYREX filter tubes (No. 9480) are often used on the bottom of these crucibles to collect the filtrate. For more information on fritted products, please check the Technical Information Listing for the Guide to Selecting and Using Fritted Glassware. These 30 mL PYREX low form crucibles have 30mm diameter coarse porosity (40 to 60 um) fritted discs They are particularly adapted to analytical work where precipitates are dried to constant weight at 110 degC They are also suitable for higher temperatures, in which case it is advisable to heat in an electric furnace Crucibles should not be subject to sudden temperature changes In order to avoid strain, they should not be removed from the furnace until the temperature has dropped to 250 degC Item Weight 3.98 ounces Manufacturer Pyrex / Corning Item model number 32960-30C-CASEOF12 Package Dimensions 6.6 x 4.1 x 3.6 inches Is Discontinued By Manufacturer No