Small Graphite Crucible for Precious Metal and Lab Melting
Product Overview
Our small graphite crucibles are precision-machined melting vessels designed for laboratory use, jewelry casting, precious metal refining, and small-batch metal melting. Available in volumes from 10 ml to 2000 ml, these compact crucibles are machined from high-purity isostatic graphite with smooth inner walls for easy pour-out and cleaning. They are ideal for melting gold, silver, copper, aluminum, and small batches of specialty metals in induction furnaces, muffle furnaces, and torch melting applications.
Small graphite crucibles are essential tools for jewelry makers, dental labs, university research laboratories, and precious metal refiners. At Jincheng Graphite, we machine compact crucibles with flat bottoms, tapered walls, and optional pouring spouts. Each crucible is precision-machined from dense, high-purity graphite that resists thermal shock and does not contaminate precious metals. We stock common small sizes for immediate shipment and can custom-machine crucibles to your exact volume and shape requirements.
Key Features
- Compact sizes - from 10 ml mini crucibles to 2000 ml lab-scale vessels
- High purity graphite - low ash prevents contamination of precious metals
- Smooth inner walls - easy pour-out and cleaning between melts
- Thermal shock resistant - withstands rapid heating and cooling without cracking
- Flat stable base - sits securely on furnace hearths and induction coil cradles
- Optional pouring spout - precision-machined spout for clean, controlled pouring
- Wide temperature range - usable up to 3000°C in appropriate atmospheres
- Reusable - can be cleaned and reused for many melting cycles
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-purity isostatic graphite |
| Bulk Density | 1.78 - 1.85 g/cm³ |
| Ash Content | < 100 ppm |
| Available Volumes | 10 ml, 25 ml, 50 ml, 100 ml, 250 ml, 500 ml, 1000 ml, 2000 ml |
| Max Temperature | 3000°C (vacuum/inert) |
| Wall Thickness | 3 - 8 mm |
| Bottom Thickness | 5 - 10 mm |
| Inner Surface Finish | Ra 1.6 µm |
| Outer Shape | Cylindrical, tapered, with spout option |
| Flatness of Base | < 0.1 mm |
| Dimensional Tolerance | ±0.3 mm |
| Packaging | Individual foam-packed, export carton |
Applications
- Jewelry casting - small crucibles for gold and silver jewelry melting
- Precious metal refining - assay and small-batch gold/silver refining
- Dental labs - melting dental alloys and casting investments
- University and R&D labs - small-scale metal melting and materials research
- Small foundries - prototype and small-batch non-ferrous metal casting
- Goldsmith and silversmith workshops - torch and furnace melting of precious metals
Why Choose Jincheng Graphite?
- Lab-grade purity - low-ash graphite suitable for precious metal melting
- Stock sizes available - common small crucible sizes ship within 3-5 days
- Custom shapes - tapered, spouted, or unusual geometries machined to order
- Competitive pricing - affordable small crucibles for labs and small workshops
- Sample orders welcome - single crucible orders accepted for evaluation
- Smooth finish - polished inner walls for clean metal release
- Global shipping - air-shipped to jewelry makers and labs worldwide
- Quality assurance - each crucible inspected for cracks and dimensional accuracy
FAQ
Q: Can these crucibles be used in a torch flame?
A: Yes. Small graphite crucibles can be used with a torch flame for small precious metal melts. However, avoid direct torch contact with the crucible walls when possible, and preheat gradually to extend crucible life. For repeated production melting, an induction or muffle furnace is recommended.
Q: Will graphite contaminate gold or silver?
A: Our high-purity crucibles have ash content below 100 ppm and are widely used for gold and silver melting. For ultra-sensitive refining, we recommend pre-firing the crucible to 1000°C in vacuum or inert gas before first use to remove any residual volatile matter.
Q: What is the smallest crucible you can make?
A: We can machine crucibles as small as 10 ml (approximately 15 mm inner diameter, 20 mm height). For very small precision melting, contact us with your required dimensions.
Q: How do I clean a graphite crucible after use?
A: Allow the crucible to cool completely, then empty the solidified metal. Residue can be gently scraped with a soft tool or sanded lightly with fine abrasive paper. Do not use aggressive acids, as these can attack the graphite matrix.
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