A - Regular Fused Alumina


A is the most widely known abrasive powder, popularly known as Arundum. Fujimi produces A by melting bauxite in an electric furnace at a temperature of 2000° C to obtain aluminum oxide (Al2O3) corundum crystal of at least 90% purity.

In addition, the process fuses crystals with a small percentage of titanium, which increases the toughness (tenacity) of the abrasive particles. As a result, A has the highest degree of toughness of all Fujimi abrasive powders.

Fujimi manufactures A for a consistent distribution of particle sizes. This produces a highly efficient, highly stable abrasive that will not scratch the surface of the workpiece. A is thus well-suited for:

  • Super-finishing precision grindstones
  • Super-finishing lapping cloth or paper
  • Cathode ray tubes and related glassware
  • Soft metals where precision lapping is required

Standard Specifications for Particle Size

Particle Size Particle Distribution (µm)
Maximum Particle Size Particle Size at d03 Particle Size at d50 Particle Size at d94
# 240 ≤ 127 ≤ 103 58.6 ± 3.0 ≥ 40.0
# 280 ≤ 112 ≤ 87.0 49.4 ± 3.0 ≥ 33.0
# 320 ≤ 98.0 ≤ 74.0 41.1 ± 2.5 ≥ 27.0
# 360 ≤ 86.0 ≤ 66.0 36.1 ± 2.0 ≥ 23.0
# 400 ≤ 75.0 ≤ 58.0 30.9 ± 2.0 ≥ 20.0
# 500 ≤ 63.0 ≤ 50.0 26.4 ± 2.0 ≥ 16.0
# 600 ≤ 53.0 ≤ 43.0 21.1 ± 1.5 ≥ 13.0
# 700 ≤ 45.0 ≤ 37.0 17.9 ± 1.3 ≥ 11.0
# 800 ≤ 38.0 ≤ 31.0 14.7 ± 1.0 ≥ 9.00
# 1000 ≤ 32.0 ≤ 27.0 11.9 ± 1.0 ≥ 7.00
# 1200 ≤ 27.0 ≤ 23.0 9.90 ± 0.80 ≥ 5.50
# 1500 ≤ 23.0 ≤ 20.0 8.40 ± 0.60 ≥ 4.50
# 2000 ≤ 19.0 ≤ 17.0 6.90 ± 0.60 ≥ 4.00
# 2500 ≤ 16.0 ≤ 14.0 5.60 ± 0.50 ≥ 3.00
# 3000 ≤ 13.0 ≤ 11.0 4.00 ± 0.50 ≥ 2.00
# 4000 ≤ 11.0 ≤ 8.00 3.00 ± 0.40 ≥ 1.30

Notes:
Particle size is measured by Electrical sensing zone methods up to size #4000.

Quality Standards

Particle Size Specific Gravity Chemical Composition (%)
Al2O3 SiO2 Fe2O3 TiO2 Na2O
#240 ~ #1200 ≥ 3.85 ≥ 90.0 ≤ 5.00 ≤ 0.80 ≤ 5.00 -
#1500 ~ #4000 ≥ 3.75 ≥ 80.0 ≤ 18.00 ≤ 1.00 ≤ 3.00 -

 

Product Stats:

Category:
Lapping & Grinding

Application:
Precision Coated Polishing Paper, precision lapping, Hardened Glass Lens Lapping, Silicon Wafer Precision Blasting, Soft Metals Lapping, Semiconductor Substrate Precision Blasting, Precision Satin Finishing, Super Finishing Phenol Bond Grindstone, Super Finishing Vitrified Grindstone, Precision Coated Polishing Cloth, Precision Coated Polishing Tape

Type:
abrasive powder, Grindstone Materials, Precision Blasting, Precision Lapping

Material:
bauxite, aluminumoxide, alundum