99 Alumina Cylindrical Crucibles with Threaded Lid | Airtight | Customizable

These 99 Alumina Cylindrical Crucibles with Threaded Lid are made from high-purity Al₂O₃ (>99%) using a precision slip-casting process, ensuring high density and smooth, uniform surfaces inside and out. The threaded design provides an airtight seal, minimizing contamination and preventing sample loss during high-temperature experiments.

Designed for continuous use up to 1600°C, these crucibles are ideal for controlled laboratory reactions, heat treatment, and research applications requiring high purity and thermal stability.

Available Sizes (Diameter × Height):
14 × 25 mm
25 × 30 mm
36 × 39 mm
63.5 × 60 mm
71.2 × 157.6 mm

Usage Instructions:

• Heat and cool gradually with the furnace.

• Avoid rapid temperature changes or direct flame contact.

• Not recommended for metal smelting applications.

Precautions for Using 99% Alumina Crucibles

1. Pre-drying: Before first use, heat at approximately 105°C for 120 minutes to remove moisture.

2. Avoid direct flame: Do not use gasoline, acetylene, or alcohol torches to prevent cracking from uneven heating.

3. Maintain clearance: Keep at least 2 cm between the crucible and heating elements (e.g., carbon tubes, silicon carbide 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 to avoid thermal shock.

5. Support positioning: For large crucibles, avoid direct contact with the furnace floor. Use corundum or other heat-resistant plates to elevate the crucible, enhance airflow, and extend service life.