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XTL sintyron 6a 7a 8a fire assay cupel

The cupel is placed in a furnace and heated to high temperatures, causing any impurities or base metals in the sample to oxidize and be absorbed into the cupel's porous structure. This leaves behind only the pure precious metal, which can then be weighed and analyzed.

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XTL sintyron 6a 7a 8a fire assay cupel

Fire assay cupel are preferred for this process because they have a high resistance to heat and can withstand the extreme temperatures required for fire assay. They are also porous, allowing for the absorption of impurities without affecting the precious metal being assayed. Additionally, ceramic cupels are non-reactive, meaning they will not chemically react with the metal being assayed, ensuring accurate results.

Product Description


 1.Made of Magnesite or Bone .

    2.Used for smelting and assaying .

    3.High thermal shock resistance .


    Magnesia: ≥95%

    Silica, Silicon dioxide: 0-5%

    Property: High refractoriness(1100 centigrade degrees),rapid absorption(70%),and recovery                   

    rate of 97%-98.5%,easy to use, without milling .



Specifications with cupels

1.Material:Magnesian and cement

2.For the analysis of non-ferrous and precious metals.

3.We are manufacturers of fire assay crucibles and magnesite and ash bone cupels. 4.We produce

several capacity crucibles and cupels and only use selected vrgin materials for production.

5.We have special packing for export and very competitive prices. 6.Our crucibles are high standard,

for repetitive assays and free of gold.



Top OD




Bottom OD


Top ID


Inner Depth





XTL-6A 40 26 30 30-32 12-13 50-55 200
XTL-7A 40 30 30 30-32 11-15 58-60 200
XTL-8A 43-45 31-35 35-39 32-35 12-13 80-86 200
XTL-9A 50-52 31-35 39-43 39-41 11-15 120-123    120    


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Company Information

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fire assay crucible (141).jpg 


Why us?
* Professional manufacturer since 1997.
* Strict quality control on production process and tolerance.
* Free samples available
* Customized production based on your drawing or specification
* On-time delivery and reliable support and service
* Inventory available for quick shipment
* We keep confidentiality of all the drawings and business information between us.
Are you a trading company or a manufacturer?
* We are a manufaturer. 
Can you provide the free samples?
* Yes,we can offer free sample if we have it in stock,but the courier fee is to be collected.
Do you accept customized production based our specification?
* Yes,we offer OEM and ODM service. Just send us your drawing if you have it. If you don’t have a drawing, just tell us your idea, we will work out the drawing for you.

What's the delivery time?
* 7 working days for standard products 30 days for customized products. 
What is the MOQ?
* No limit to the quantity. We can offer the best proposal and solutions according to your condition.
What is the payment terms you accept?
* T/T,LC,Western Union,moneygram are acceptable.
How to deal with the faulty?
* Firstly, Our product are produced in strict quality control system and the defective rate will be less than 2%.
If there are problems with the product, we will provide free replacement.


Intention information