Pure Graphite Crucible Cup for Propane Torch Melting Gold Silver Copper Metal Excellent thermal stability: suitable for conditions involving rapid heating and cooling. Resistant to corrosion and impact, ensuring reliable product quality; resistant to strong acids and strong alkalis. Good heat transfer performance: helps significantly shorten melting time and save energy. Ash content less than 0.1%, preventing contamination during precious metal smelting. Low thermal expansion coefficient at high temperatures; possesses certain resistance to thermal shock and quenching; long service life. Color: Black Size: 40 x 30mm Hole diameter: 20mm Material: Graphite Bulk density ≥ 1.78 g/cm³ Electrical resistivity ≤ 9 Ohm mm²/m Bending strength ≥ 40 MPa Compressive strength ≥ 70 MPa Particle size ≤ 43 μm High thermal conductivity and temperature resistance; suitable for melting gold, silver, and other precious metals and alloys using high-purity graphite crucible. Product features include high-temperature resistance, anti-oxidation, corrosion resistance, and extended service life. Utilization: Graphite crucible is commonly used in the smelting of alloy tool steels and nonferrous metals and their alloys. It can also be applied in the processing of graphite products such as casting crucibles, pull rods, molds, and tanks. Graphite crucible offers greater durability compared to ordinary materials, with longer service life and ability to withstand temperatures exceeding 2000°C. Usage Tips: Store in a dry place; avoid exposure to moisture. After drying, do not allow the crucible to come into contact with water. Avoid mechanical impact; do not drop or subject to strong impacts. Package Included: 1 x Pure Graphite Crucible Cup Note: Lighting and display differences may cause slight color variation between the image and actual item. Measurement error allowance is +/- 1-3 cm.