99 Alumina Blocks Support Pads for Large Crucibles

These Alumina Blocks Support Pads for Large Crucibles are precisely manufactured through a high-density slip-casting process, ensuring smooth and uniform surfaces inside and out. They provide excellent mechanical strength, stability, and resistance to both high temperatures and chemical corrosion — ideal for supporting large crucibles in demanding laboratory and industrial environments.

Specifications

• Product Name: 10-Well Divided Semi-Circular Boat

• Material: 99% Alumina (Al₂O₃)

• Volume: 30 mL

• Wall Thickness: 3 mm

• Outer Dimensions (L × W × H): 100 × 40 × 20 mm

• Firing Temperature: 1800°C

• Operating Temperature: 1600°C

• Recommended Furnace Tube Inner Diameter: > 46 mm

Applications

Used for laboratory and industrial analyses involving both metal and non-metal samples, as well as for melting and thermal processing.
Suitable for various analytical and high-temperature testing environments.

Usage Precautions for 99% Alumina Crucibles

1. Pre-drying: Before first use, dry the crucible in an oven at approximately 105°C for 2 hours to remove moisture.

2. Avoid Direct Flame: Do not heat directly with gasoline torches, acetylene torches, or alcohol lamps, as uneven heating may cause cracking.

3. Keep Distance from Heating Elements: Maintain at least a 2 cm gap between the crucible and heating components (e.g., carbon tubes, SiC rods, heating wires).

4. Control Heating/Cooling Rate:

   • Below 1200°C: ≤ 5°C per minute

   • Above 1200°C: ≤ 4°C per minute

   • Use controlled power cooling; avoid switching off power abruptly at high temperatures.

5. For Large Crucibles: Avoid direct contact with the furnace floor. Place the crucible on high-temperature-resistant supports (e.g., corundum plates) to enhance air convection and extend service life.