PWA - Platelet Calcined Alumina


PWA is a white calcined alumina abrasive powder consisting of plate-shaped crystals of aluminum oxide (Al2O3) with a purity of over 99.0%.

  • Chemically inert
  • Will not be corroded by either acids or alkalines
  • Excellent heat-resistant properties
  • Greater number of uniform grades than available from most manufacturers

The particle size distribution is tightly controlled and produces a very fine lapped surface allowing a wide range of applications, such as:

  • Lapping agent for:
    • Silicon
    • Optical materials
    • Liquid crystal
    • Stainless steel
    • Other materials
  • Filler material for coatings
  • Material for lapping cloth or paper
  • Compounding agent combined with a metal or synthetic resin

Standard Specifications for Particle Size

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Particle Size Particle Distribution (µm) Notes
Maximum Particle Size Particle Size at d03 Particle Size at d50 Particle Size at d94
45 < 82.9 53.4 ± 3.20 34.9 ± 2.30 22.8 ± 1.80 Discontinued
40 < 77.8 41.8 ± 2.80 29.7 ± 2.00 19.0 ± 1.00  
35 < 64.0 37.6 ± 2.20 25.5 ± 1.70 16.0 ± 1.00  
30 < 50.8 30.2 ± 2.10 20.8 ± 1.50 14.5 ± 1.10  
25 < 40.3 26.3 ± 1.90 17.4 ± 1.30 10.4 ± 0.80  
20 < 32.0 22.5 ± 1.60 14.2 ± 1.10 9.00 ± 0.80  
15 < 25.4 16.0 ± 1.20 10.2 ± 0.80 6.30 ± 0.50  
12 < 20.2 12.8 ± 1.00 8.20 ± 0.60 4.90 ± 0.40  
9 < 16.0 9.70 ± 0.80 6.40 ± 0.50 3.60 ± 0.30  
5 < 12.7 7.20 ± 0.60 4.70 ± 0.40 2.80 ± 0.25  
3 < 10.1 5.20 ± 0.40 3.10 ± 0.30 1.80 ± 0.30  
1 - - - -  

Quality Standards

Type of Product Specific Gravity Chemical Composition (%)
Al2O3 SiO2 Fe2O3 Na2O
PWA3 ~ PWA45 > 3.90 > 99.0 < 0.20 < 0.10 < 1.00

 

Product Stats:

Category:
Lapping & Grinding

Application:
Super Finishing Silicate Grindstone, Super Finishing Phenol Bond Grindstone, Precision Coated Polishing Tape, Precision Coated Polishing Paper, Hard to Soft Metal Lapping, Optical Plastic Lapping, Filler for Coating, Honing Stones, Gallium Arsenide Lapping, Silicon Lapping, Filler for Heavy Electrical Machinery Parts, Precision Coated Polishing Cloth, lapping agent, compounding agent, coating, Optical Glass Lapping, filter, Quartz Crystal Lapping, abrasive, Silicon Wafer Lapping, Crystal Lapping, Hardened Glass Lens Lapping, Soft Metals Lapping, Super Finishing Vitrified Grindstone

Type:
Precision Coating Materials, Filler Materials, abrasive powder, Precision Lapping Materials, Super Finishing Grindstone Materials

Material:
aluminumoxide, alumina