White Corundum HS Code 28181090, CAS No. 1344-28-1, is a kind of high-grade refractory and abrasives, was made from the high quality alumina by melting above 2000 °C in the electric arc furnace and cooling. It is white with the main crystal phase alpha-Al2O3. The micro hardness of the product is 2200-2300kg/mm2. The abrasive tools made of it are suitable for grinding high carbon steel, high-speed steel and chilled steel. It can also be used as sandblasting, lapping and polishing medium, precision founding sand, coating materials, catalyst carrier, special ceramics and super refractory materials.
Basic Indicators
| Molecular Formula | Al2O3 |
| Appearance | White powder |
| CAS No. | 1344-28-1 |
| HS Code | 28181090 |
Physical properties
| Color | White |
| Crystal shape | α-Al2O3 Trigonal |
| Hardness(mohs) | ≥9.0 |
| Micro Hardness | HV2200-2300 |
| Melting Point (℃) | 2250 |
| True Density (g/cm3) | ≥3. 97 |
| Bulk Density(g/cm3) | 1.75-1.95 |
| Linear Expansion Coefficient(0—1600℃) | 8.3 |
Typical chemical analysis
Al2O3: 99,50%
Na2O+K2O: 0,25%
Fe2O3: 0,02%
SiO2: 0,03%
CaO: 0,10%
C: 0,05%
Applications
Section sand & fine powder used for refractory,castables,painting
Size:0-1mm 1-3mm 3-5mm 3-6mm 5-8mm 8-10mm
Al2O3:99.5%min Fe2O3:0.04%max Na2O:0.3%max
Size: -100MESH -150MESH -200MESH -320MESH
Al2O3:99.0%min Na2O:0.40%max Fe2O3:0.20%max
Grit size sand used for abrasives,blasting,grinding
Size: FEPA F8 F10 F12 F14 F16 F20 F22 F24 F30 F36 F40 F46 F54 F60 F70 F80 F90 F100 F120 F150 F180 F220
JIS #8 #10 #12 #14 #16 #20 #24 #30 #36 #46 #54 #60 #70 #80 #90 #100 #120 #150 #180 #220
Al2O3:99.5%min Fe2O3:0.04%max Na2O:0.3%max
Micro powder used for abrasives ,lapping,Polishing
Size: FEPA F230 F240 F280 F320 F360 F400 F500 F600 F800 F1000 F1200 F1500 F2000
JIS #240 #280 #320 #360 #400 #500 #600 #700 #800 #1000 #1200 #1500 #2000 #2500 #3000 #4000 #6000 #8000
Al2O3:99.2-99.6% Fe2O3:0.02-0.08% Na2O:0.20-0.40%
Packing and storage
Packing: Double coated plastic woven / paper bag, net weight 25kg.
Big bag packing, net weight 1000kg / 1250kg per clients’ request.
Storage: Dry, ventilated, moisture proof.
