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{"title":"Fire Assay Cupellation Furnace for Gold Silver Precious Metal Testing","imgUrl":"https:\/\/img.chinax.com\/nimg\/0a\/d8\/3fbb755fea6b93cd9d99d697de15-200x200-1\/fire_assay_cupellation_furnace_for_gold_silver_precious_metal_testing.jpg","attrs":{"Model Number":"Fire Assay Cupellation Furnace","Application":"Fire Assay Cupellation","Price":"Negotiate","Rated Temperature":"1000\u00b0C"}}
{"title":"High Capacity 1200\u00b0C Fire Assay Fusion Furnace for Gold Assay Laboratory","imgUrl":"https:\/\/img.chinax.com\/nimg\/fb\/b1\/447bdc0ff2398c06f15b0d5edea2-200x200-1\/high_capacity_1200_c2_b0c_fire_assay_fusion_furnace_for_gold_assay_laboratory.jpg","attrs":{"Model Number":"Fire Assay Fusion Furnace","Maximum Temperature":"1200\u00b0C","Price":"Negotiate","Door Operation":"Pneumatic"}}
{"title":"Silicon Carbide Heating Element 1200\u00b0C Fire Assay Fusion Furnace for Gold Ore","imgUrl":"https:\/\/img.chinax.com\/nimg\/0b\/ea\/892d90c51e32f1ae5655c7b0c4af-200x200-1\/silicon_carbide_heating_element_1200_c2_b0c_fire_assay_fusion_furnace_for_gold_ore_laboratory_testing.jpg","attrs":{"Place of Origin":"China","Heating Element":"Silicon Carbide (SiC)","Payment Terms":"L\/C,T\/T","Temperature Control":"Electronic Temperature Control"}}
{"title":"24 Hole Magnesia Cupel Brick with 96% MgO Content for Fire Assay Gold Testing","imgUrl":"https:\/\/img.chinax.com\/nimg\/43\/1a\/0eec43fcd18668e2f61c6a87282a-200x200-1\/24_hole_magnesia_cupel_brick_with_96_25_mgo_content_for_fire_assay_gold_testing.jpg","attrs":{"Working Temperature":"About 900 C","Product Name":"Fire Assay Cupel Block","MgO Content":"96%","Model Number":"Cupel Block"}}
Magnesia Cupel 96% MgO Round Refractory Cupel for Fire Assay Gold Silver Analysis
96% MgO High Purity Magnesia Cupel for Fire Assay Gold and Silver Analysis
Y&X magnesia cupels are engineered for the cupellation step of fire assay—the stage that most directly determines analytical accuracy. Made from 96% high purity magnesium oxide (MgO) with a special fluxing agent and formed by high pressure molding plus high temperature sintering, every cupel offers a smooth surface, uniform shape and high mechanical strength that resists cracking, pitting and lead spitting at high temperature.
What Is a Magnesia Cupel?
A cupel is a shallow, porous refractory crucible used in the cupellation stage of fire assay, holding the lead button while absorbing molten lead oxide (PbO). In the furnace at about 900°C the lead button melts, lead reacts with oxygen to form PbO, and capillary action of the porous cupel absorbs most of the liquid PbO. Gold and silver, which resist oxidation, remain on the cupel surface as a bright, dense precious metal bead.
Why Cupel Quality Matters
Insufficient absorption leaves PbO in the bead and affects gold and silver purity and weighing accuracy
Cracking or pitting at high temperature can cause melt leakage and sample loss, invalidating the assay
Poor batch consistency increases scatter between parallel samples and fails laboratory quality control
Key Advantages
96% high purity MgO formula with a special fluxing agent for superior absorption
Smooth surface and uniform shape for repeatable batch results
High mechanical strength: no cracking or pitting during cupellation
Absorbs more than 70% of its own weight in lead oxide
No lead spitting or splashing, for high precious metal recovery and low loss
Excellent thermal shock resistance, ready to use without pre-drying
Not affected by atmospheric humidity, no freezing tendency in any climate
Precious metal beads release easily from the cupel wall
In-house laboratory testing on a regular schedule for traceable batch quality
Sizes, packaging and private label support available on request
Applications
Gold mine laboratories, third-party precious metal testing institutions and precious metal refineries use these cupels for high precision fire assay sample preparation, including standard samples and quality control samples in daily operation.
Specifications
Parameter
Value
MgO Content
96%
PbO Absorption
Over 70% of own weight
Working Temperature
About 900°C
Shape
Single round cupel
Sizes
Nearly 20 sizes, 2X to No.14 and Straight 40
Y&X focuses on the fire assay analysis field and supplies a full range of high purity magnesia cupels and cupel bricks. Contact us for a quote or custom specification.
Frequently Asked Questions
Q: Cupel vs cupel brick—which should I choose?
A: A cupel is a single round dish for small or individual samples; a cupel brick is a multi-cavity block that cupels many samples per run. Same material, same principle. Under 20 samples/day use cupels; over 20 use a cupel brick.
Q: How do I choose the right cupel model?
A: It depends on furnace chamber size (max outer diameter) and lead button weight (capacity). 20-30 g → model 2X or No.3; 50-80 g → the 7A or No.8 series; over 100 g → No.10 and above. Y&X offers nearly 20 standard models plus customization—contact us for a recommendation.
Q: Do magnesia cupels need pre-drying?
A: No, they go straight into the furnace. High purity magnesia gives excellent thermal shock resistance, so a room-temperature cupel can be placed directly into the hot furnace.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Trading Company,Seller,Exporter
Year Established:
2014
Total Annual:
50000000-65000000
Employee Number:
20~100
Ecer Certification：
Verified Supplier
Y&X Beijing Technology Co., Ltd. is a mining-focused technology company dedicated to helping mineral processing laboratories and mining enterprises achieve more accurate test results, more stable process design, and higher beneficiation efficiency.
Y&X provides complete mineral processing...
Y&X Beijing Technology Co., Ltd. is a mining-focused technology company dedicated to helping mineral processing laboratories and mining enterprises achieve more accurate test results, more stable process design, and higher beneficiation efficiency.
Y&X provides complete mineral processing...
