Tooltos High Purity Graphite Crucible Electric Melting Furnace Accessories
- 73 in stock
Description
The replacement crucible for professional jewelry casting studios — 99.9% high purity graphite heats faster than ceramic, handles gold, silver, copper and aluminum up to 1300°C, and a pouring slot gives you controlled, directed metal transfer into the mold. Available in 1KG, 2KG and 3KG to match your typical charge volume.
Key Selling Points
- 99.9% high purity graphite construction — consistent material quality ensures reliable performance and long service life across repeated melting cycles
- Maximum operating temperature of 1300°C (2372°F) — sufficient for melting gold, silver, copper, brass, and aluminum at their respective casting temperatures
- Excellent thermal conductivity — graphite heats faster than ceramic crucibles, reducing furnace time and energy consumption per melt
- Pouring slot design allows controlled, directed metal transfer from crucible to mold without requiring separate pouring tools
- Corrosion and oxidation resistant — maintains structural integrity under repeated high-temperature exposure
- Available in 1KG, 2KG, and 3KG capacity — choose the size that matches your typical metal charge volume
About This Crucible
Graphite crucibles are the standard choice for precious metal melting in jewelry studios because graphite does not react with gold, silver, or copper at casting temperatures and its high thermal conductivity allows the furnace to heat the metal charge quickly and evenly. The 99.9% purity rating means minimal impurities in the graphite body, which reduces the risk of contamination in the melt and extends the working life of the crucible compared to lower-purity alternatives.
The pouring slot is a practical feature for studio use — it gives you a defined channel to direct the molten metal flow when pouring into a mold or ingot form, which improves pour control and reduces spatter compared to pouring over the rim of a plain cylindrical crucible. The three capacity options (1KG, 2KG, 3KG) cover the range from small single-piece jewelry casting to larger batch production runs.
Choosing Your Capacity
| Capacity | Best For | Choose If |
|---|---|---|
| 1KG | Small jewelry casting, single pieces, scrap re-melting | You typically melt small quantities per session |
| 2KG | Medium batch production, multiple pieces per pour | You need more capacity than 1KG but don't require maximum size |
| 3KG | Larger casting runs, higher-volume studio production | You regularly melt larger charges and need maximum capacity |
Best For / Not For
| Best For | Not For |
|---|---|
| Melting gold, silver, copper, brass, and aluminum in electric melting furnaces | Temperatures above 1300°C — do not exceed the maximum rated temperature |
| Jewelry studios and casting workshops needing fast, efficient metal melting | Sudden thermal shock — always preheat gradually and avoid cold contact when hot |
| Repeated melting cycles where thermal conductivity and durability matter | Highly oxidizing atmospheres at extreme temperatures — graphite can oxidize above its rated limit |
Technical Specifications
| Material | 99.9% high purity graphite |
| Max Temperature | 1300°C (2372°F) |
| 1KG — Inside Dimensions | 40 x 115mm |
| 1KG — Outside Dimensions | 65 x 125mm |
| 1KG — Weight | 0.33kg (11.6 oz) |
| 2KG — Inside Dimensions | 45 x 140mm |
| 2KG — Outside Dimensions | 70 x 155mm |
| 2KG — Weight | 0.38kg (13.4 oz) |
| 3KG — Inside Dimensions | 50 x 150mm |
| 3KG — Outside Dimensions | 75 x 170mm |
| 3KG — Weight | 0.42kg (14.8 oz) |
| Design Feature | Pouring slot for controlled metal transfer |
| Compatible Metals | Gold, silver, copper, brass, aluminum and non-ferrous alloys |
Pro Tips
- Preheat the crucible gradually at a low furnace setting before bringing it to full temperature — sudden thermal shock is the most common cause of graphite crucible cracking.
- Choose the smallest crucible that accommodates your metal charge — using a 3KG crucible for a small 1KG melt wastes furnace energy and increases heating time unnecessarily.
- Clean the crucible after each use once it has cooled completely — residual metal and flux left in the crucible can contaminate the next melt and accelerate crucible degradation.
- Store in a dry environment — graphite can absorb moisture, which causes steam formation during heating and can contribute to cracking. Keep the crucible covered when not in use.
- Inspect for cracks before every use — even a hairline crack can propagate under thermal stress and cause the crucible to fail during a melt, releasing molten metal into the furnace.
- Dedicate separate crucibles to different metals where possible — residue from copper or brass can contaminate a subsequent gold or silver melt if the same crucible is reused without thorough cleaning.
Frequently Asked Questions
What metals can I melt in this crucible?
Suitable for gold, silver, copper, brass, aluminum, and other non-ferrous metals up to 1300°C. Not recommended for ferrous metals (iron, steel) or metals requiring temperatures above 1300°C.
Which capacity should I choose?
Choose based on your typical metal charge weight. The 1KG is suited for small jewelry casting and single-piece work. The 2KG handles medium batch production. The 3KG is for larger casting runs. It is better to use a crucible that is slightly larger than your charge than one that is too small.
Is this compatible with my electric melting furnace?
The crucible is compatible with most electric melting furnaces rated for 1300°C or higher. Verify that the crucible dimensions (inside and outside) fit your furnace chamber before ordering.
Why use graphite instead of clay or ceramic?
Graphite has significantly higher thermal conductivity than clay or ceramic, which means faster, more even heating of the metal charge. It also does not react with gold, silver, or copper at casting temperatures. Clay crucibles are lower cost but heat more slowly; graphite is the preferred choice for professional jewelry studio use.
How long does a graphite crucible last?
Service life depends on the metals used, furnace temperatures, thermal cycling frequency, and how carefully the crucible is handled. With proper preheating, gradual cooling, and regular inspection, high-purity graphite crucibles can last for many melting cycles. Replace immediately if any cracks appear.
What if I have questions after receiving the crucible?
Contact the Tooltos team at sales@tooltos.com. We respond within 24 hours on business days.
What's Included
- 1 x High purity graphite crucible (1KG, 2KG, or 3KG as selected)
Support
Questions about capacity selection, furnace compatibility, or order status? Contact the Tooltos team at sales@tooltos.com. We respond within 24 hours on business days.
