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XTL sintyron Magnesium Oxide Bone Ash Laboratory Cupels

When gold is melted down, impurities such as silver, copper, or other metals may also be present. The cupel works by absorbing these impurities as the gold is heated, allowing the pure gold to separate and pool at the bottom of the cupel.

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Magnesium Oxide Bone Ash Laboratory Cupels

To use a cupel for gold melting, the gold is placed in the cupel along with a flux material, such as

lead oxide or borax. The cupel is then heated in a furnace to a high temperature, usually around

1,100 degrees Celsius. As the gold melts,the impurities are absorbed by the cupel, leaving behind

a button of pure gold at the bottom.

Product Description


1.Made of magnesia.

2.Used for smelting and assaying.

3.High thermal shock resistance.

4.On time delivery.  


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.


Specification of Magnesia cupel and Pure bone ash cupels  
Item no. Height(mm) Diameter at top         (mm) Diameter at bottom           (mm) Depth of valley(mm)
XTL-MA 35 40 40 16
XTL-MB 26 36 36 15
XTL-MC 35 30 30 15
XTL-MD 20 25 25 8
XTL-M/GF 22 23 18 7
XTL-M/GA 28 40 30 8
XTL-M/GB 30 40 30 15


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Company Information

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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