Graphite Crucible for Precious Metal Melting
Product Overview
Jincheng graphite crucibles for precious metal melting are high-purity, precision-made graphite crucibles designed for melting gold, silver, platinum, and other precious metals in jewelry manufacturing, dental labs, and precious metal refining. These crucibles provide excellent thermal conductivity and minimal metal contamination for high-purity precious metal processing.
Our precious metal melting crucibles are manufactured from high-density, fine-grain isostatic graphite that ensures clean melting and easy pouring of precious metals. Various sizes and shapes are available to match different melting furnaces and jewelry making applications.
Key Features
- High purity graphite with low ash content to prevent precious metal contamination
- Excellent thermal conductivity for fast and uniform metal melting
- High temperature resistance up to 1600°C for melting most precious metals
- Good thermal shock resistance for repeated heating and cooling cycles
- Smooth inner surface for easy metal pouring and minimal metal loss
- Various sizes and shapes for different melting applications and furnace types
- Easy to clean after melting operations
- Cost-effective compared to ceramic or clay-graphite crucibles for precious metal work
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High density fine grain isostatic graphite |
| Density | 1.75 - 1.85 g/cm3 |
| Ash Content | < 100 ppm (precious metal grade) |
| Shore Hardness | 60 - 75 HS |
| Compressive Strength | 80 - 120 MPa |
| Thermal Conductivity | 100 - 130 W/m·K |
| Max Working Temperature | 1600°C (in inert or reducing atmosphere) |
| Capacity | 50 g - 50 kg (custom) |
| Wall Thickness | 3 - 10 mm (size dependent) |
| Tolerance | ±0.5 mm |
Applications
- Gold melting and casting for jewelry manufacturing and goldsmith work
- Silver melting and casting for silver jewelry and silverware production
- Platinum and palladium melting for platinum jewelry and catalytic applications
- Dental precious metal casting for dental crowns and bridges
- Precious metal refining for gold and silver recovery and refining operations
- Laboratory precious metal melting for analytical and research applications
Why Choose Jincheng Graphite Crucibles?
- Precious metal grade high purity graphite to prevent contamination of valuable metals
- Various sizes available from small jewelry crucibles to large refining crucibles
- Competitive pricing as a direct graphite crucible manufacturer
- Fast delivery - standard crucibles from stock, custom within 1 week
- Custom crucible designs available for special melting applications
- Technical support for crucible selection and melting process optimization
- Consistent quality with strict purity and dimension control
- Global shipping to jewelry makers, dental labs, and precious metal refiners worldwide
Frequently Asked Questions
Q1: What size crucible do I need for my jewelry melting application?
A: Crucible size depends on the amount of metal you need to melt and your furnace type. We offer crucibles ranging from 50g capacity for small jewelry work to 50kg capacity for larger refining operations. Please specify your melting requirements for size recommendation.
Q2: How long do precious metal melting crucibles last?
A: Crucible life depends on melting temperature, frequency of use, and atmosphere. Under typical jewelry melting conditions (gold/silver at 1000-1200°C), graphite crucibles last 50-200 melts before needing replacement.
Q3: Can I use graphite crucibles for melting platinum?
A: Yes, graphite crucibles can be used for melting platinum at temperatures up to 1600°C. However, platinum will react with graphite at very high temperatures, so crucible life may be shorter. For platinum work, we recommend using our highest purity graphite grade.
Q4: How do I clean and maintain graphite crucibles?
A: After melting, allow the crucible to cool completely, then remove any solidified metal residue. The crucible can be lightly sandblasted or polished to remove surface impurities. Avoid thermal shock by gradually heating and cooling the crucible.
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