The base material is made of 99.9995% ultra-pure graphite powder (D50 = 3μm ultra-fine particles), which is formed through uniform pressure application of 250MPa throughout the entire area. The density can reach 1.92–1.95g/cm³, with a residue content of ≤8ppm, and there is no contamination from alkali metals or heavy metals. This product specifically addresses the three core pain points of gold smelting: leakage loss of gold liquid due to micro-pores in the crucible wall, impact on gold purity due to impurity migration, and safety accidents caused by thermal shock cracking. It is compatible with mainstream gold smelting equipment such as medium-frequency induction furnaces, muffle furnaces, and vacuum arc furnaces. It is the preferred high-purity gold melting container for global jewelry factories, precious metal refineries, and geological laboratories.
Precise casting crucible for precious jewelry (1–5kg, small-scale high-frequency application)
Suitable for jewelry factories for 1–5kg of gold / platinum / silver small-batch precision casting. It adopts thin-wall isostatic pressing technology, with uniform wall thickness deviation of ≤ 0.1mm. The bottom has an arc-shaped transition design without dead corners, ensuring smooth gold liquid flow without residue and a metal recovery rate of over 99.98%.
The inner wall is treated with mirror polishing (Ra ≤ 0.2μm), which is non-stick to the gold liquid and easy to demold, reducing subsequent grinding processes. It is equipped with a dedicated graphite cover to reduce gold evaporation loss (≤ 0.015% per furnace cycle). It is compatible with medium-frequency induction furnaces for rapid heating (heating rate up to 120℃/min), meeting the requirements for frequent and small-batch production of jewelry.
High-purity molten gold crucible for precious metal refineries (10–50kg medium-large scale continuous production)
For the processes of crude gold purification and electrolytic gold ingot casting in gold refineries, a thickened high-density isostatic pressing graphite substrate is adopted. The anti-shock cycle times are ≥ 1200 times (1600℃ ↔ room temperature), and it can be continuously used for 80 furnaces without cracking or deformation.
Ultra-low ash content (≤ 8ppm) + no alkali metal impurities (Na/K ≤ 0.002ppm), ensuring a 99.999% high-purity gold output; unique flow guide design, allowing smooth pouring of gold liquid without splashing, suitable for continuous production lines in refineries, reducing the intensity of manual operations and increasing production efficiency by 30%.
Special laboratory crucible for micro-gold analysis (10–500g ultra-small high-precision)
Designed for geological exploration, metallurgical analysis, and research institutions, this ultra-small gold melting crucible has a minimum capacity of only 10g and is compatible with laboratory equipment such as tube furnaces and box furnaces, meeting the requirements for melting, ashing, and enrichment analysis of micro-gold samples.
It uses spectral-grade graphite raw materials and undergoes secondary vacuum degassing treatment. The gas emission at 1200℃ is less than 5×10⁻¹¹ Pa·m³/s, without carbon-hydrogen volatile substances contaminating the samples. It is precisely designed with graduations, facilitating quantitative analysis of gold samples, and comes with customized crucible clamps for safe and convenient operation.
Core performance and product features
Fast heat conduction, energy-saving and efficient
Thermal conductivity: 145–155 W/(m・K) (1000℃), heating rate up to 120℃/min, shortens the melting time by 30%, reduces energy consumption by 25%, suitable for high-frequency induction furnace rapid melting process.
Customized adaptation, covering all scenarios
Supports full capacity customization of 10g–50kg, compatible with all gold melting equipment such as medium-frequency induction furnaces, muffle furnaces, vacuum furnaces, etc. Can customize special structures like covers, flow channels, scales, etc. to meet different production needs.
Safe and reliable, easy to operate
Can withstand high temperatures up to 2800℃ (in inert atmosphere), no toxic gas release at high temperatures. Equipped with dedicated graphite covers and crucible tongs. Safe operation, reduces the risk of work-related injuries.
Why Choose Us?
Special isostatic pressing production line for gold melting, with zero risk in gold purity
2. Patent for ultra-fine particle formula, with industry-leading metal recovery rate
3. Full-scenario customization capability, compatible with all gold-forging equipment
4. Technical support for gold melting process, reducing customer production costs
5. Global rapid delivery + 24-hour after-sales response
| No. | Parameter Item | High-Purity Isostatic Graphite Gold Melting Crucible Standard | Test Method |
|---|---|---|---|
| 1 | Base Material | Ultra-high Purity Synthetic Graphite (99.9995% Fixed Carbon) | High-temperature Combustion Analysis |
| 2 | Forming Process | Cold Isostatic Pressing (CIP) at 250MPa | Pressure Sensor Monitoring |
| 3 | Bulk Density | 1.92 – 1.95 g/cm³ | Archimedes Principle Density Test |
| 4 | Density Uniformity Deviation | ≤ ±0.03 g/cm³ | Multi-point Density Scanning |
| 5 | Total Ash Content | ≤ 8 ppm | ICP-MS Full Element Analysis |
| 6 | Alkali Metal Impurity (Na + K) | ≤ 0.002 ppm | Ultra-trace ICP-MS Detection |
| 7 | Heavy Metal Impurity (Pb/Cd/As) | ≤ 0.001 ppm | Inductively Coupled Plasma Spectrometry |
| 8 | Internal Porosity | ＜ 0.08 % | Mercury Intrusion Porosimetry |
| 9 | Inner Surface Roughness | ≤ 0.2 μm (Ra) | Surface Profilometer Test |
| 10 | Thermal Conductivity (1000℃) | 145 – 155 W/(m·K) | Laser Flash Method |
| 11 | Coefficient of Thermal Expansion (25–1600℃) | 2.2 × 10⁻⁶ /℃ | High-temperature Dilatometer |
| 12 | Thermal Shock Resistance Cycles | ≥ 1200 cycles (1600℃ ↔ RT) | Thermal Cycle Aging Test |
| 13 | Maximum Working Temperature | 1600℃ (Air), 2800℃ (Inert Gas) | Ultra-high Temperature Furnace Test |
| 14 | Gold Adhesion Loss | ＜ 0.005 g per melting cycle | Gravimetric Analysis |
| 15 | Gold Volatilization Loss | ≤ 0.015 % per melting cycle | Mass Spectrometry Detection |
| 16 | Continuous Service Life | ≥ 80 production cycles | Actual Gold Melting Production Test |
| 17 | Available Capacity Range | 10g – 50kg (Customizable) | Dimension Measurement |
| 18 | Wall Thickness Uniformity | ≤ ±0.1 mm | High-precision Caliper |
| 19 | Custom Structure Options | With lid / spout / graduation marks / special shape | CNC Precision Machining |
| 20 | Compressive Strength (Room Temperature) | ≥ 120 MPa | Universal Material Testing Machine |
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