Polycarbonate Surfacing Pad System

The tried and trusted Cerium procedure for surfacing semifinished Polycarbonate lenses.

1. Apply Ceriguard lens protection tape to the front surface of the lens in the conventional manner.

2. Block the lenses giving maximum coverage using 117 degree F alloy.

3. Generate dry, using a 20 mesh plated diamond wheel or single point cutter. The lens should not be fed in at more than 0.4mm per cut with a final cut of 0.1mm (an extractor unit should be fitted to the generator to remove dust and chips of polycarbonate).

4. An alternative method would be to use one of the new modern wet cutting generators. These have been especially designed to deal with cutting Polycarbonate lenses.

5. Ensure that the edge of the lens has a safety chamfer, also ensure that any loose particles are removed before fining.

6. Use high speed surfacing equipment for fining and polishing. cerium recommend that for the fining process fresh water direct to waste is used as this will reduce the likelihood of very fine scratches or swirls occurring.

7. A good quality filter system such as the Cerium MK IV Cold Filter should be used during the polishing stage, chilled to 55 degrees or lower, to ensure the best quality finish.

8. Use a quality high stock removal polish. Cerium recommend Prestige for use with Polycarbonate lenses.

9. After polishing, de-block and wash with a water and mild detergent solution and blow dry. Never touch the polished surface with fingers or any dry materials as damage will occur.

10. Hard coat the lenses as soon as possible to reduce the risk of surface damage. Ensure that a tintable hard coating solution is used if the lenses require a tint.

  
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