Small Graphite Crucible for Gold and Silver Precious Metal Melting and Lab
Product Overview
Our small graphite crucibles for precious metal melting are compact, high-purity graphite vessels designed for melting gold, silver, platinum, and other precious metals in jewelry workshops, assay laboratories, and small-scale refining operations. Available in capacities from 10 grams to 2 kg, these small crucibles withstand the high temperatures needed for gold (1064°C), silver (962°C), and copper (1085°C) melting without contamination or chemical reaction. At Jincheng Graphite, we manufacture small precision-machined graphite crucibles that jewelers, assayers, and small refiners rely on for clean, accurate precious metal melting and casting.
Precious metal melting requires crucibles that are chemically inert, easy to clean, and do not contaminate the metal with impurities. Graphite is the preferred crucible material for gold and silver because it does not alloy with these metals, releases the melt cleanly, and can be used directly in torch melting, electric furnaces, and induction furnaces. We supply small round and conical crucibles with precision-machined walls and smooth interiors for easy metal recovery and cleaning.
Key Features
- Precious metal inert - no reaction with gold, silver, platinum, or copper
- High temperature - withstands up to 1600°C for all precious metal melting
- Clean release - solidified metal releases cleanly from the graphite surface
- Small capacity range - 10 g to 2 kg for jewelry and lab use
- Smooth interior - machined interior minimizes metal loss and residue
- Torch and furnace compatible - works with hand torch, electric furnace, or induction
- Easy to clean - residual metal removes easily; crucible reusable
- Cost effective - affordable small crucibles for small-batch melting
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-purity fine-grain graphite |
| Bulk Density | 1.75 - 1.85 g/cm³ |
| Operating Temperature | up to 1600°C |
| Capacities | 10g, 25g, 50g, 100g, 250g, 500g, 1kg, 2kg (gold equivalent) |
| Outer Diameter | 20 mm - 60 mm |
| Height | 25 mm - 80 mm |
| Wall Thickness | 3 mm - 6 mm |
| Bottom Thickness | 5 mm - 10 mm |
| Interior Finish | Ra 1.6 µm (smooth machined) |
| Shape Options | Round cylindrical, conical (narrow base), with lip |
| Compatible Fuels | Hand torch, electric furnace, induction furnace |
| Lead Time | 3-7 business days |
Applications
- Jewelry making - small crucibles for gold and silver jewelry casting
- Assay laboratories - fire assay and analytical lab melting crucibles
- Small-scale refining - melting scrap gold, silver, and dental alloys
- Dental labs - casting gold and dental alloy melting
- Laboratory research - small melting vessels for material research
- Goldsmith workshops - daily use crucibles for custom jewelry work
Why Choose Jincheng Graphite?
- High purity - low impurity graphite that does not contaminate precious metals
- Precision machined - smooth interior for minimal metal loss
- Small size expertise - specialized in small crucibles for lab and jewelry
- Fast shipping - small crucibles in stock for immediate dispatch
- Affordable - factory-direct pricing for small crucibles
- Reusable - crucibles last through many melting cycles
- Packaged well - protected shipping for small precision crucibles
- Global delivery - jewelers and labs in 30+ countries
FAQ
Q: Can I melt silver in a graphite crucible?
A: Yes. Silver melts at 962°C, well within the capability of a graphite crucible. Silver does not wet or alloy with graphite, and the solidified silver releases cleanly. Graphite is actually preferred over clay crucibles for silver because it heats faster and is easier to clean.
Q: How do I clean a graphite crucible after melting?
A: Allow the crucible to cool completely, then tap out the solidified metal. If residue remains, gently scrape with a graphite or brass tool (not steel, which can embed iron). Light sanding with fine emery paper restores a smooth interior. Do not use water, as graphite absorbs moisture.
Q: Can I use a torch directly on the crucible?
A: Yes. Small graphite crucibles can be heated directly with a hand torch using acetylene/oxygen or propane/oxygen. Start with a gentle preheat to avoid thermal shock, then bring to melting temperature. Graphite's high thermal conductivity makes it an excellent torch-melting vessel.
Q: Will graphite contaminate my gold?
A: No. At gold melting temperatures (1064°C) in air, graphite remains chemically inert and does not alloy with gold. The small amount of surface oxidation that occurs produces only CO/CO2 gas, which leaves no residue in the metal. Your gold purity will not be affected.
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