Raw Material Composition & Material Advantages
Our precious metal melting graphite crucible adopts high-purity artificial isostatic graphite / reinforced high-density graphite as the base material, specially formulated for precious metal industry, no impurity separation, no chemical reaction with gold and silver liquid.
Main Material: High-purity fine grain graphite, carbon purity ≥99.95%, ultra-low ash content ≤0.03%
Reinforced Process: 3000℃ high-temperature graphitization + vacuum impregnation densification + high-temperature anti-oxidation coating treatment
Material Characteristics: Compact structure, low porosity, high thermal conductivity, acid and alkali corrosion resistance, no sticking precious metal liquid
Core Industry Advantage: Effectively prevent precious metal alloy contamination, reduce metal loss, ensure bright and uniform casting surface
|
Performance Item |
Standard Parameter |
International Test Standard |
|---|---|---|
|
Bulk Density |
≥1.85 g/cm³ |
ASTM C559, ISO 5018 |
|
Carbon Purity |
≥99.95% |
ASTM C709 |
|
Ash Content |
≤0.03% |
High-purity graphite industry standard |
|
Compressive Strength |
≥110 MPa |
ASTM C695 |
|
Flexural Strength |
≥50 MPa |
ASTM C651 |
|
Thermal Conductivity |
120–150 W/m·K |
ASTM E1461 |
|
Thermal Expansion Coefficient |
≤3.8×10⁻⁶/℃ |
ASTM E228, ISO 11359 |
|
Max Working Temperature |
1600℃–1800℃ |
ISO 1450 refractory standard |
|
Porosity |
≤8% |
ISO 2738 |
International Compliance Standards
Our precious metal graphite crucibles strictly follow global authoritative testing and manufacturing standards, support third-party testing and customer project audit.
ASTM Standards: ASTM C559 density test, ASTM C651 bending strength, ASTM C695 compressive strength, ASTM E1461 thermal conductivity, ASTM C709 high-purity carbon material standard
ISO Standards: ISO 9001 quality system, ISO 5018 physical performance, ISO 2738 porosity test, ISO 1450 high-temperature refractory standard
Industry Standard: Fully compliant with global jewelry casting, precious metal refining and laboratory high-temperature smelting specifications
Application Scenarios
This graphite crucible is the most widely used graphite smelting container in the global precious metal industry, perfectly suitable for all precious metal melting and casting scenarios.
Jewelry Casting Industry: Gold, silver, platinum, palladium jewelry melting, vacuum casting, lost wax casting
Precious Metal Refining: Precious metal recycling, waste gold and silver material purification, alloy proportioning smelting
Induction Furnace Smelting: Medium and high frequency induction furnace special graphite crucible for precious metal rapid melting
Laboratory R&D: University laboratory precious metal experiment, material research and small-batch smelting test
Non-ferrous Alloy Manufacturing: Copper alloy, brass, bronze high-precision casting
Suitable for small-batch handmade jewelry workshop, medium-scale casting factory and large precious metal refining industrial mass production.
Strict Quality Assurance & Traceability System
IQC Raw Material Inspection
Each batch of graphite raw materials tests purity, ash content, density and high-temperature stability to eliminate unqualified materials
IPQC In-process Inspection
Monitor machining size, wall thickness uniformity and surface finish in real time
Complete Traceability System
Each batch has independent batch number, traceable raw material report, production record and inspection data for more than 5 years
Factory Mass Production & Export Capability
Professional Equipment
Equipped with high-precision CNC machining equipment, high-temperature graphitization furnace, vacuum densification equipment and professional physical and chemical testing laboratory
Stable Production Capacity
Monthly output of tens of thousands of precious metal graphite crucibles, support long-term large orders and framework cooperation
Mature Export Experience
Long-term export to Europe, America, Southeast Asia, Middle East, Africa and other precious metal processing regions; proficient in FOB, CIF, EXW international trade terms and complete export documents
Stable Supply Chain
Long-term cooperation with high-purity graphite raw material suppliers, stable material purity and batch consistency
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