Precision CNC-turned fine-grain isostatic graphite crucibles with low ash content (<20–500 ppm) for non-ferrous, precious metal, alloy, and crystal-growth melting.
Cold-isostatically pressed (CIP) fine-grain synthetic graphite combines isotropic thermal conductivity, complete immunity to thermal shock, natural molten-metal non-wetting (Au, Ag, Cu, Al, Sn, rare earths, brass), and increasing mechanical strength as temperature rises toward 2,500 °C in vacuum or inert atmospheres. Unlike clay-graphite foundry pots that introduce binder slag, pure machined isostatic graphite maintains clean melt chemistry.
Available in standard cylindrical, tapered, and pour-spout induction geometries or custom-turned from purified (<20–50 ppm ash) graphite billets with matching threaded or slip lids.
| Property / Metric | Nominal Reference Value (Grade Dependent) |
|---|---|
| Bulk Density | 1.78–1.90 g/cm³ (isostatic fine-grain grades) |
| Average Grain Size | 5–15 µm |
| Ash Content | Standard <300–500 ppm; Halogen-purified <5–50 ppm |
| Max Service Temp | ~450–500 °C (Air onset of oxidation) / 2,800 °C (Inert Ar/N2) / 2,200 °C (Vacuum) |
| Flexural Strength | 45–75 MPa (increases ~25% at 2,000 °C) |
Reference values reflect typical sintered, fused, or wrought grades. Exact batch test figures are confirmed on your written quotation and accompanying lot Certificate of Analysis.
Specify crucible OD × ID × overall height × inner depth, melt alloy/material (avoid unprotected graphite for carbon-soluble Fe/Ni/Ti/Pt melts!), operating atmosphere, ash purity limit, lid style, and quantity.
Include target quantity, destination country/postal code for express air freight calculation, and any special cleanroom bagging or certification requests.
Prepare Graphite Crucibles RFQ ↗Complementary furnaceware, substrates, PVD consumables, and refractory hardware frequently ordered together.
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Submit your purity grade, geometry, quantity, and documentation requirements. Every order includes the producing mill's batch Certificate of Analysis (COA) and pre-shipment dimensional verification.