Complaint
Black Fused Alumina
The main raw material of black fused alumina is aluminum oxide (AI2O3) with a content of 70% to 80%, containing more impurities such as silicon oxide and titanium oxide, and is a black corundum. It is a new type of environmental protection material.
Black fused alumina is also called low-aluminum corundum, is a gray-black crystal with α-Al2O3 and iron spinel as the main mineral phases, which is obtained by smelting bauxite in an electric arc furnace. It is characterized by a low Al2O3 content, and a certain amount of Fe2O3 (about 10%) exists, so black fused alumina has the characteristics of moderate hardness, high toughness, high temperature resistance and stable thermal performance.
| Subject | Indicator value |
| Name | black fused alumina |
| color | black |
| melting point | 2050ºC |
| Bulk density | 3.5 g/cm3 |
| Moh's hardness | 9.0 |
| Knoop hardness | 1800-2200 kg/mm2 |
| Maximum use temperature | 1850ºC |
| Size | 16#, 24#, 30#, 36#, 46#, 60#, 80#, 100#, 120#, 150#, 180#, 200#, 325# |
| Grade | Chemical Composition | |||
Al2O3 | SiO2 | Fe2O3 | TiO2 | |
| I | ≥ 85 | 6-9 | 5-8 | 2-4 |
| II | ≥ 80 | › 9 | › 8 | › 4 |
The main uses of black corundum are as follows:
1. Black corundum can be used for free grinding, such as bottom surface polishing of metal parts before electroplating, aluminum products.
2. Black corundum can be used for bicycles, motorcycles, sewing machines, clock parts and so on.
3. Black corundum can be used for polishing lighting, plastic and hardware tools, etc. It is also suitable for sandblasting (rust removal, glass spraying).
4. Black corundum can be used as a processing material to manufacture resin cutting sheets, angle grinding sheets and coated abrasives.
5. Black corundum grain size sand and micro powder are especially suitable for the grinding and polishing of stainless steel workpieces and the manufacture of whetstone and grinding paste.
6. Black corundum section sand is the preferred material for non-slip pavement and storage under coal mine pits.
The commonly used packaging forms are as follows:
25kg/bag, 25Kg/drum, 500kg/Jumbo, lined PE water-proof and outer metal or carbon drum,
the weight and measurement clearly marked on package.
Besides, we can customize packaging according to customer needs.
Ningxia Yongruida Carbon Co., Ltd. is a manufacturer integrating production and sales. We have abundant strength and enthusiastic service attitude. We have exported to many countries, such as Europe, Asia, Africa, Australia, South America and so on, and have been well received by customers.
In addition, we have professional R&D and sales teams, and own factories and laboratories. Each batch of our product samples will be inspected by our quality inspector. After a series of tests, our products will be delivered to customers to provide them with quality assurance.
Above are the certificates related to our products. We have relevant approval certificates for product export, as well as declarations of conformity to standards.
Our products have quality inspection certificates that meet the standards, and the quality inspection certificates are certified by the China Quality Certification Center.
Q: Are you trading company or manufacturer ?
A: We are factory.So you do not have to worry about quality and price, we can guarantee the best quality and the most reasonable price.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: What's your MOQ?
A: Normally, 1000kg. But any trial order, which quantity is less than MOQ, is also warmly welcomed.
Q: What are your advantages?
A: First, high quality and best ex-factory price.
Second, strict management and quality control system.
Third, high-quality service team, providing timely service.
