6A 7A 8A Refractory Fire Assay Crucibles MGO Magnesium Oxide Cupel

• Customization: Available
• Application: Refractory, Metallurgy
• Material: MGO
• Model NO.: 99%
• Shap: Conical, Circular, Cylindrical, Oval etc
• Sample: Avaliable
• Usage: Gold Melting, Precious Metal Assay, Fire Assay
• Transport Package: Cartons with Pallets
• Specification: 4A, 6A, 7A. 7AS, 7AL, 7X, 8A, 9A.
• Trademark: FIZA
• Origin: Hebei China
• HS Code: 69039000
• Production Capacity: 1000000PC Per Month

Product Description

Product Description

Cupellation is the last and most important step in fire assay process and as such, the quality of cupel is extremely crucial.

During cupellation, the lead is oxidized to litharge (PbO), most of which is absorbed by the cupel. Gold, silver, platinum and other precious metals form a bead in the cupel. The bead is subsequently treated to determine its precious metal content.

Our magnesia cupel uses high-quality raw materials and a unique formula. And its composition includes up to 95% magnesium oxide and special flux. It can absorb more lead oxide than ordinary bone ash ones. So our magnesia cupel has strong mechanical strength and perfect quality uniformity.
 

 

Product Parameters

Item	Result
MgO	≥95%
Al2O3	≥1.2%
SiO2	≤2.5%
CaO	≤1.3%
Working Temperature	890ºC-1100ºC
Specific Gravity:	2.35
Porosity:	12%-15%
Lead Absorption	70%

 

Product Specification

Size	A	B	C	D	E	F
	mm	mm	mm	mm	mm	mm
4A	22	27	20	7.5	24	6
4AS	22	27	20	8	24	9
6A	26	40	30	6	30	12
7	22	39.5	29	6.5	31.2	11
7A	32	40	30	12	30	12
7AL	28.5	39.7	30	6	31.2	12.3
7AS	34	40	30	14	30	12
8	27.1	44.3	34.6	9	34.2	8.5
8A	35	45	37	13	38	13
9A	34	51	39	14	40	15

Applications:

Packaging & Shipping

Cartons with pallets, or as your request.

Our Advantages

High quality magnesite is the majoritary component of  magnesia cupels. 
As a rule of thumb, magnesia cupels have a superior quality and offer many advantages:

1. Great mechanical strength, and are not affected by atmospheric conditions (not hygroscopic). . 
2. The prill or bead does not adhere to the fire assay cupel surface, 
3. When using magnesia cupels, the assay have a reduced tendency to freeze.  
4. No cracking or spiting, and the beads do not attach to the fire assay cupel surface.
5. Magnesia cupels provide security and quickly absorb great amounts of litharge without cracking or pitting. 
6. Our magnesia cupels allow to reduce the Cupellation temperature and time, resulting in minimal losses, higher accuracy and better yields.
7. Perfect uniformity of Quality of cupels 
8.  Quality and performance are continuously improved

Company Profile

Hebei Fiza Technolory Co., Ltd, is a professional manufacturer of assay litharge, assay flux, crucible (Clay crucible, Ceramic Crucible), Magnesia cupel and Magnesia Bulion Block and with perfect management system and mature production technology.

The crucible, cupel and other fire assay consumables are made of high quality raw materials, high temperature resistance, good thermal conductivity, high melting purity, strong corrosion resistance and long service life.

Our staff of sales and technical support is available to help you in selecting the right protection for your application as well
as to provide you with samples of our products for evaluation. At High Five, we are committed to providing the highest level of customer service, competitive pricing, speedy delivery and a comprehensive, cutting-edge product offering. Our ultimate goal is your satisfaction. 

Welcome to contact me for Quotation!

Sherry yang