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1. Use the metal flat plate and Aluminum oxide wet dry sandpaper (Fig. 6).
   1. Start with lowest grit and move to highest.
      1. 240 grit will flatten the sample, but will leave it scratched.
      2. 400 grit will help remove scratches left by the 240.
      3. 600 grit is the finest and will make the billet smooth for bonding.
2. Hold the billet flat by applying equal pressure across the sample and move in a figure 8 motion on the paper (Fig. 6).
   1. Move the figure 8 slowly across the whole surface.
   2. Rotate the billet from time to time.

Metal Flat PlateAluminum Oxide Wet Dry Sandpaper Image Removed
Figure 6 Image Added
                                       Figure 6

3. When finished, the flat side of the billet should reflect light and feel smooth to touch (Fig. 5). If any parts look dull or feels rough, it may need more time sanding.

1. 1. Some materials will remain dull if very soft.
   2. If the billet has been impregnated it will reflect light.

4. Wipe the billet clean with a kimwipe and isopropyl alcohol.