Product Overview
High-purity graphite crucibles specifically designed for melting platinum, gold, silver, and other precious metals. With exceptional purity, high temperature resistance, and non-contamination properties, our precious metal melting crucibles ensure clean, contamination-free melting of gold, platinum, palladium, and other high-value metals for jewelry and investment casting.
Key Features
- Ultra-high purity graphite for minimal contamination
- Ash content below 50ppm for precious metal melting
- High temperature resistance up to 3000°C
- Smooth inner surface for easy pouring and cleaning
- Good thermal shock resistance
- Available in various sizes and shapes
- Compatible with induction and torch melting
Technical Specifications
| Parameter | Unit | Value |
|---|---|---|
| Material | - | High Purity Isostatic Graphite |
| Bulk Density | g/cm³ | 1.80 - 1.88 |
| Ash Content | ppm | <50 |
| Max Working Temp | °C | 3000 (inert/vacuum) |
| Capacity Range | g (gold) | 50 - 5000 |
| Wall Thickness | mm | 3 - 10 |
| Inner Surface Finish | Ra μm | ≤1.6 |
Applications
- Gold and silver melting for jewelry making
- Platinum and palladium melting
- Precious metal investment casting
- Dental alloy melting
- Laboratory precious metal analysis
- Gold refining and recycling
- Metal sample preparation for analysis
Why Choose Jincheng Precious Metal Crucibles?
We supply high-purity graphite crucibles for jewelry manufacturers, gold refineries, and research laboratories. Our precious metal crucibles are manufactured from ultra-high purity graphite to ensure no contamination of valuable metals. We offer a range of standard sizes as well as custom crucibles for specialized melting equipment.
FAQ
Q: Can platinum be melted in a graphite crucible?
A: Yes, graphite crucibles are commonly used for melting platinum and other precious metals. However, platinum can react with graphite at very high temperatures to form platinum carbide, which can slightly contaminate the metal. For ultra-high purity applications, zirconia or alumina crucibles are recommended, but graphite is standard for most jewelry and industrial melting.
Q: What size crucible do I need for melting gold?
A: Crucible size depends on the amount of gold being melted. As a general guide, 1 gram of gold occupies about 0.05 cm³. Choose a crucible that can hold 1.5-2 times the volume of your metal to allow for stirring and pouring. Please contact us with your specific requirements for size recommendations.
Q: How do I clean and maintain graphite melting crucibles?
A: Allow the crucible to cool completely before cleaning. Remove residual metal with a soft brush or by gentle sandblasting. Do not use water on hot crucibles as thermal shock can cause cracking. Properly maintained graphite crucibles can last for hundreds of melts.
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