Crucibles are consumables and their lifetime is closely tied to correct use and proper cleaning. The average lifetime is 20-30 analyses. Crucibles class 0 porosity with 160-250 μm (ASTM) holes and crucibles class 1 porosity with 100-160 μm (ASTM) holes. . The correct use of crucibles in the muffle furnace for analyzing ashes and proper cleaning in accordance with the recommendations in the operating manual is crucial
TIPS FOR CRUCIBLE TREATMENT IN A MUFFLE FURNACE
The heating and cooling of glass crucibles for determining ash content require special care in order to prevent breakages. Thermal shock can lead to breakage, particularly in stressed areas such as the junction between the crucible body and the filter disk. A temperature of 550 °C corresponds to the beginning of the glass’s plastic state and should not be exceeded.