Fire Assay Cupel Multiple Sizes 96% MgO High PbO Absorption for Gold Assay
Product Introduction
Y&X fire assay cupels are engineered for the cupellation stage of gold, silver, and precious metal analysis. Manufactured from 96% magnesium oxide with a specialized fluxing agent formulation, these cupels feature smooth surfaces, uniform shapes, and exceptional mechanical strength.
During cupellation, the porous cupel efficiently absorbs molten lead oxide (PbO), while gold and silver remain as a precious metal bead for subsequent analysis. Multiple cupel sizes are available to meet diverse fire assay laboratory requirements.
Key Features
- 96% MgO formulation optimized for fire assay cupellation
- PbO absorption exceeding 70% of the cupel's own weight
- Multiple diameters, heights, and cavity sizes available
- Smooth surface and uniform product shape
- High mechanical strength
- Designed to resist cracking, pitting, and lead spitting during cupellation
- Excellent thermal shock resistance; no pre-drying required
- Precious metal bead is easily removable after cupellation
- Custom sizes and packaging available
Models & Specifications
| Model |
Height H (mm) |
Top OD D (mm) |
Bottom Dia. D2 (mm) |
Cavity Dia. D1 (mm) |
Cavity Depth H1 (mm) |
Pcs/Carton |
| 2X |
17 |
24 |
19 |
18 |
8 |
1008 |
| 3 |
20 |
26 |
20 |
23 |
5.5 |
500 |
| 4A |
22 |
27 |
20 |
24 |
6 |
500 |
| 4 |
22 |
29 |
23 |
24 |
6 |
486 |
| 5 |
26 |
35 |
26 |
27 |
8 |
324 |
| 6A-26 |
26 |
40 |
30 |
31.2 |
11.8 |
300 |
| 6A-29 |
29 |
40 |
30 |
31.2 |
11.8 |
240 |
| 7A |
32 |
40 |
30 |
31.2 |
11.8 |
200 / 300 |
| 7AS (7X) |
35 |
40 |
30 |
31.2 |
11.8 |
200 / 300 |
| 7AS-15 |
32 |
40 |
30 |
32 |
15 |
300 |
| 8 |
27.1 |
44.3 |
34.6 |
34.2 |
8.5 |
240 |
| 8A |
35 |
45 |
37 |
38 |
13 |
200 |
| 8AM |
35 |
45 |
37 |
33 |
12 |
200 |
| 8S |
40 |
44 |
34 |
38 |
14 |
200 |
| 9 |
30 |
51 |
43 |
40 |
11 |
120 |
| 9A |
34 |
51 |
39 |
40 |
15 |
120 |
| 10 |
30.2 |
60 |
49.7 |
52.6 |
11.5 |
75 |
| 11 |
44 |
56.8 |
48.8 |
47.8 |
14.8 |
80 |
| 14 |
70 |
110 |
88 |
80 |
24 |
12 |
| Straight 40 |
32 |
40 |
40 |
-- |
-- |
200 |
Different packing configurations are available for some models.
Selection Guide
Cupel selection should be based on required outside diameter, cavity diameter, cavity depth, lead button size, and cupellation furnace configuration.
If replacing existing cupels, provide the model or dimensions for precise specification matching.
Applications
Suitable for: Gold Mine Assay Laboratories • Fire Assay Laboratories • Geological Exploration • Commercial Testing Laboratories • Precious Metal Refineries • Gold and Silver Analysis
Quality Importance
During cupellation, insufficient PbO absorption can affect the final precious metal bead, while cracking or pitting may result in sample loss. Consistent cupel dimensions and absorption performance are critical for reliable fire assay testing.
Y&X conducts periodic laboratory testing to monitor product quality and ensure batch consistency.
Frequently Asked Questions
Can you supply different cupel sizes?
Yes. Multiple specifications from 2X to 14 and Straight 40 are available. Custom sizes and packaging can also be provided.
How can I confirm the correct model?
Provide your current cupel model, dimensions, lead button information, or furnace requirements, and we will assist with specification matching.
About Y&X
Y&X Beijing Technology Co., Ltd. supplies fire assay equipment and consumables for gold, silver, and precious metal analysis, including cupels, cupel blocks, fusion furnaces, and cupellation furnaces.
Custom specifications and packaging are available according to laboratory requirements.
