Alumina sand (corundum sand) is one of the most economical abrasives for both dry and wet production processes. It is especially suitable for the treatment of rougher workpiece surfaces, while the treated surfaces require finer surfaces. This sharp, angular synthetic material is second only to diamond in hardness and is often used where iron contamination is critical. It can cut very hard materials or be spherical to process extremely precise workpieces to achieve extremely low roughness. Its high density, sharp, angular structure makes it the fastest cutting abrasive.  
    Brown corundum is made by fused high quality bauxite, while high quality aluminate is used to produce powdered corundum and white corundum. Their natural crystal structure makes them high in hardness and fast in cutting performance. At the same time they are often used as raw materials for bonded abrasives and coated abrasives.
     Corundum sand can be recycled in standard blasting equipment, the number of recycling is related to the material grade and the specific process.

grade	16	24	36	40	60	80	120
Surface roughness（um）	100	75	63	50	40	25	13
Cleaning speed	very fast
Damage speed	About 5-7 damage/cycle

Note: The above parameters are for comparison only.

Abrasive properties

shape Angular, blocky   Typical chemical composition  Hardness (Mohs standard)   9 chemical components White corundum Brown corundum Chrome corundum  particle S.G.  3.9-3.94 Alumina >99.0% >95.0% >99.0%  densitykg/cubic meter  2400 Iron oxide <0.1% <0.3% N/A  colour  Brown white pink Titanium oxide N/A <3.0% N/A  Size standard  FEPA/ANSI Silica <0.1% <0.7% <0.1%   Calcium Oxide <0.1% 0.6% <0.1%   Sodium oxide N/A 0.35% 0.35%

Product Size

grade	8	10	12	14	16	20	24	30	36	40
Micron	2360	2000	1700	1400	1180	850	710	600	500	425
inch （.001）	0.094	0.079	0.066	0.056	0.047	0.039	0.028	0.023	0.019	0.016
grade	46	60	80	100	120	150	180	220	240	320
Micron	355	250	180	150	125	88	74	62	53	30
inch （.001）	0.014	0.010	0.007	0.005	0.004	0.0035	0.003	0.0025	0.002	0.0012

package      25kg/package