Magnesium Oxide Cupel Block

Magnesium Oxide Cupel Block Description

Magnesium Oxide Cupel Block is a monolithic refractory block made from high-purity and high-density magnesium oxide, featuring multiple precisely formed cavities for simultaneous cupellation operations. Each cavity functions as an independent reaction chamber, enabling accurate and efficient fire assay of precious metals. During use, the block quickly absorbs large quantities of lead oxide without splashing or cracking, leaving high-purity gold and silver alloy grains. It maintains excellent structural integrity under extreme temperatures and remains stable against humidity and freezing conditions. After cupellation, the metallic grains can be easily separated from the cavities.

Magnesium Oxide Cupel Block Specifications

Type	Hole	Hole(Length Direction)	Hole(Width Direction)	a (mm)	b (mm)	c (mm)	d (mm)
4 HB	4	2	2	4	4	4	4
4 SAHB	4	2	2	5	5	6	6
6 HB	6	3	2	2.5	2.5	5	5
6 HB(T)	6	3	2	5.25	4	5.5	4
10 HB	10	5	2	5	5	6	4.5
12 HB	12	4	3	3	3	6	6
12 HB(L)	12	6	2	5.25	5.25	5.5	4.5
14 HB	14	7	2	3	3	2	2
21 HB	21	7	3	3	3	2	2
24 HB	24	6	4	4	4	4	4
24 HB(L)	24	6	4	5.5	4	5.5	5.6

Magnesium Oxide Cupel Block Specifications (Bevel-Edge and Straight-Edge) 

Type	Hole	Length		Width		Height	Diameter of Hole	Depth of Hole	Ridge Height	Bevel-Edge Height	Weight (Approx.)
		L	L1	W	W1	H	D	H1	H2	H3	g
4 HB	4	48	—	48	—	20	18	6.5	—	—	97
4 SAHB	4	80	—	80	—	26	30	9	—	—	321
6 HB	6	76.5	—	51	—	20	20.5	8	—	—	150
6 HB(T)	6	82	72	60	50	20	22	7	6	14	184
10 HB	10	138	128	60	50	20	22	7	6	14	307
12 HB	12	80	—	60	—	20	14	7	—	—	204
12 HB(L)	12	165	155	60	50	20	22	7	6	14	375
14 HB	14	179	—	54	—	20	20	7.5	—	—	367
21 HB	21	172	162	76	66	20	22	7	6	14	476
24 HB	24	124	114	84	74	20	16	7	6	14	402
24 HB(U)	24	165	—	120	—	20	21.5	7	—	—	830

Magnesium Oxide Cupel Block Features

• High-Purity Raw Materials: Manufactured using premium-grade magnesium oxide and advanced formulations to ensure consistent density, purity, and absorption performance.
• Uniform Structure and Smooth Surface: Each block features a precisely formed surface with clean, well-defined cavities for accurate and efficient cupellation.
• Exceptional Mechanical Strength and Thermal Stability: Withstands repeated high-temperature use without cracking, warping, or pitting, ensuring long-lasting durability.
• Stable Against Environmental Conditions: Resistant to moisture, temperature fluctuations, and freezing, maintaining stable quality during long-term storage.
• Efficient Lead Oxide Absorption: Capable of rapidly absorbing large amounts of lead oxide—up to about 70% of its own weight—ensuring minimal loss of precious metals.
• Advanced Production and Quality Control: Manufactured using modern machinery under ISO 9001-certified systems, with ongoing laboratory testing to guarantee consistent product quality.

Magnesium Oxide Cupel Block Applications

• Fire Assay Analysis: Used in laboratories for determining precious metal content in ores, concentrates, and alloys through the cupellation process.
• Gold and Silver Refining: Efficiently separates precious metals from lead and other impurities, ensuring accurate recovery of high-purity gold and silver.
• Mining and Metallurgical Testing: Essential for quality control and assay testing in mining operations, smelting plants, and metal refining facilities.
• Analytical Laboratories: Applied in research and testing institutions for reliable quantitative analysis of noble metals.
• Industrial Quality Assurance: Used in production environments where precise metal content verification is required for raw materials and finished products.