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7A Magnesia Cupels

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MOQ : 5 Metric Tons

7A Magnesia Cupels Specification

Usage & Applications
Cupellation process for assaying and refining of precious metals

Surface Finish
Smooth inner surface

Melting Point
About 2800C

Chemical Composition
MgO (Magnesium Oxide) >98%

Density
1.9 Gram per cubic centimeter(g/cm3)

Water Absorption
Very low

Hardness (%)
Mohrs Hardness > 6

Application
Gold and silver assaying, precious metal refining

Purity(%)
>98%

Form
Solid

Product Type
7A Magnesia Cupel

Types of Refractories
Magnesia refractory

Shape
Cup-shaped

Porosity
High open porosity for efficient absorption

Dimensional Stability
Excellent dimensional stability at high temperature

Strength
High compressive strength

Specific Gravity
2.3 2.6 g/cm

Thermal Conductivity
Low thermal conductivity

Color
Light Grey/White

Absorption Capacity
10-12% of weight (PbO absorption)

Size
Standard 7A (38 mm diameter, 26 mm height)

Storage Life
Long shelf life in dry conditions

Weight
Approximately 45-50 grams each

Crack Resistance
Good resistance to cracking and thermal shock

Heat Resistance
Withstands rapid temperature changes

7A Magnesia Cupels Trade Information

Minimum Order Quantity
5 Metric Tons

Supply Ability
50 Metric Tons Per Month

Delivery Time
45 Days

Sample Available
Yes

Sample Policy
Contact us for information regarding our sample policy

Main Domestic Market
All India

About 7A Magnesia Cupels

We have established ourselves as the acknowledged names of market by providing supreme quality standards of 7A Magnesia Cupels at highly economical price range. These are mainly used to absorb the lead impurities present in the metals like gold and silver. Moreover, these 7A Magnesia Cupels are extremely durable and demands no maintenance.

Other Detail :

Application : Industrial;,Commercial
Color: Milky White
Material: Magnesia
Mgo Content: 99%
Size: Customize

Technical details

Packaging Size	300 Piece
Color	Milky White
Material	Magnesia
Mgo Content	99%
Brand	iMagCup
Height	28.5 mm
Width	39.7 mm
Ridge	9 mm
Depth	11.8 mm
Weight Per Cupel	59 g
Lead Absorption Capacity	65-70%
Box Weight	18.5 Kg

Precision Assaying with Magnesia Cupels

7A Magnesia Cupels are specifically crafted for the rigorous requirements of gold and silver assaying. Their high absorbency, low water uptake, and sturdy build streamline the cupellation process, ensuring maximum recovery of precious metals. Thanks to advanced magnesia chemistry and smooth inner surfaces, users achieve repeatable, dependable results with every usage.

Durability and Resistance for High-Temperature Operations

Engineered to withstand extreme temperature shifts and prevent cracking, these cupels exhibit outstanding mechanical and thermal properties. The high purity MgO matrix resists deformation, ensuring long service life, while their high melting point and low thermal conductivity make them ideal for precious metal refining under demanding conditions.

Ideal for Laboratories and Industrial Refineries

From laboratories conducting precise analyses to large-scale industrial refineries, 7A Magnesia Cupels are trusted for their dimensional stability and high porosity. Whether for small experimental batches or bulk processing, these cupels provide consistent performance and reliable results, supporting distributors, exporters, and wholesalers across India.

FAQs of 7A Magnesia Cupels:

Q: How are 7A Magnesia Cupels used in the cupellation process?

A: 7A Magnesia Cupels are employed during cupellation to absorb lead oxide (PbO) that forms while separating noble metals from base metals. The sample is first melted in the cupel at high temperatures, facilitating the oxidation and absorption of lead, leaving behind purified gold and silver.

Q: What benefits do 7A Magnesia Cupels offer compared to other refractory types?

A: These cupels offer superior absorption capacity, high crack resistance, low thermal conductivity, and an outstanding melting point. Their smooth inner surface and excellent stability at high temperatures yield precise, repeatable results, making them the preferred choice for assayers and refiners.

Q: When should magnesia cupels be replaced during assaying operations?

A: A magnesia cupel should be replaced after each cupellation cycle. While they are durable and thermally stable, each use fills the cupels porous structure with absorbed oxides, reducing effectiveness for subsequent processes.

Q: Where are 7A Magnesia Cupels commonly supplied and distributed?

A: These cupels are widely supplied to laboratories, precious metal refineries, educational research centers, and assaying facilities across India, supported by a robust network of distributors, exporters, manufacturers, suppliers, and wholesalers.

Q: What is the process for storing 7A Magnesia Cupels to ensure a long shelf life?

A: 7A Magnesia Cupels should be stored in dry, moisture-free environments to maintain their integrity. Proper storage prevents water absorption and ensures they retain optimal mechanical and absorptive properties until use.

Q: How does the cupels high purity MgO enhance assaying results?

A: A high magnesium oxide content (>98%) ensures chemical stability at very high temperatures. This purity prevents unwanted reactions that could alter analytical outcomes, thereby enabling precise determination of precious metal content.

Q: What advantages does the high porosity and low water absorption of 7A Magnesia Cupels provide?

A: The cupels high open porosity ensures efficient absorption of PbO during cupellation, while its low water absorption protects structural integrity, delivering consistent, accurate results with minimal contamination risk.

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