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Item # Microgrit WCA, Aluminum Oxide Precision Lapping Powder


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Microgrit® WCA is an aluminum oxide powder developed and introduced by Micro Abrasives Corporation. It is characterized by platelet shaped particles, each particle being an individual crystallite.
The stringent grading and inspection techniques used at Micro Abrasives Corporation assure uniform size and quality of the particles.





Specifications  · Typical Chemical Analysis  · Applications  · Advantages  · Note

Specifications

Color

White

pH

8.5

Hardness, Mho

9.0

Specific Gravity

3.8

Crystal Structure

Hexagonal Platelet


Typical Chemical Analysis

Al2O3

99.60 %

SiO2

0.02

Fe2O3

0.03

Na2O

0.40

L.O.I.

0.35


Applications
  • Glass: Precision optics, laser optics, ophthalmic, mirrors
  • Quartz: Quartz windows, piezo-electric crystals
  • Semi-Conductor Materials: Silicon, sapphire, gallium arsenide, cadmium telluride
  • Metals: Precision lapping, debarring, polishing, etc.



Advantages
  • Crystal shape causes orientation parallel to the lap and work surface pressure is thereby distributed uniformly over a large part of the crystal surface resulting in a longer abrasive life cycle than with conventional abrasives.
  • Stock removal rates are higher because of the sliding action of the crystal, as opposed to the rolling motion of conventional abrasives.
  • Uniform size and quality of the particles prevent random scratching or damage to the workpiece.



Note
  • Because of the superior cutting rate of MICROGRIT® WCA, less powder needs to be used compared to conventional abrasives; as little as one half the amount is suggested as a starting point.
  • Standard suspension treatments are available to prevent hard packing of the abrasive. "I" treatment is designed for water based slurries and "TO" for oil slurries. Special suspension agents can be supplied when necessary.



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