Graphite Die for HPHT Lab Grown Diamond
Product Overview
Our precision graphite dies are specifically designed for HPHT (High Pressure High Temperature) lab-grown diamond synthesis, providing the essential pressure vessel and heating environment required for diamond crystal growth. Made from high-strength, high-density graphite, these HPHT graphite molds withstand extreme pressures (5-6 GPa) and temperatures (1300-1500°C) in cubic press systems.
We manufacture complete HPHT graphite assemblies including the internal cavity, heating tubes, and insulation components. Our graphite dies are optimized for diamond growers seeking consistent crystal quality, high success rates, and long die life. Custom designs available for various cubic press models and diamond growth recipes.
Key Features
- High mechanical strength for extreme pressure conditions
- High density graphite for minimal deformation under pressure
- Excellent electrical conductivity for uniform heating
- Precision machined cavity for consistent growth environment
- Low impurity content for high-quality diamond growth
- Complete die assemblies (cavity, heater, insulation)
- Compatible with major cubic press models
- Optimized design for high diamond growth success rate
Technical Specifications
| Parameter | Specification |
|---|---|
| Material | High strength isostatic graphite |
| Density | 1.85-1.90 g/cm³ |
| Flexural Strength | 55-65 MPa |
| Compressive Strength | 120-150 MPa |
| Electrical Resistivity | 8-11 μΩ·m |
| Working Pressure | 5-6 GPa |
| Working Temperature | 1300-1500°C |
| Cavity Size | Custom (10mm to 50mm diameter) |
Applications
- HPHT lab-grown diamond synthesis (yellow, white, colored diamonds)
- Industrial diamond powder production
- CBN (cubic boron nitride) synthesis
- HPHT diamond re-growth and color treatment
- Research on high-pressure material synthesis
Why Choose Jincheng Graphite?
- Specialized in HPHT graphite dies since 2010
- High-strength graphite materials for extreme pressure conditions
- Optimized die design for high diamond yield
- Complete die sets including cavity, heater, and insulation
- Custom sizes for various cubic press models
- Consistent quality from batch to batch
- Competitive pricing for diamond growers
- Technical support for die design and process optimization
FAQ
Q: How many growth cycles can an HPHT graphite die withstand?
A: Typical die life is 10-20 growth cycles depending on pressure, temperature, and diamond size. Our high-strength graphite formulation maximizes die life and reduces production costs per carat.
Q: Can you supply complete HPHT graphite assemblies?
A: Yes, we supply complete graphite packages including the internal cavity cylinder, heating tube, top/bottom insulation discs, and seed holder. Please specify your press model for a complete assembly.
Q: What sizes of HPHT dies do you offer?
A: We manufacture HPHT graphite dies ranging from small research-scale cavities (10mm diameter) to production-scale cavities (up to 50mm diameter) for growing larger gem-quality diamonds. Custom sizes available.
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