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Optical Glass Properties

Contract Lapping for Thickness, Flatness, Parallelism

Valley Design provides contract precision lapping, grinding and optical polishing services, operating from 30,000 sq.ft. facilities in the Boston, MA area. The company is ISO 9001:2008 certified and grinds, laps and polishes most materials.

Customer specifications may include:

  • Surface finish
  • Thickness tolerance
  • Flatness
  • Parallelism
  • Single sided or double sided lapped or polished
  • Squareness
  • Scratch specification
  • Defect specification
  • Step and counterbore depth tolerance
  • Coplanarity with different assembled materials

Lapping specifications will be met by using a combination of diamond slurries and compounds, free abrasive and fixed abrasive materials.

Precision lapping and optical polishing processes include:

  • Polishing pads
  • Electro polishing
  • Diamond slurries
  • Diamond suspensions
  • Lapping compounds
  • Abrasive slurries
  • CMP
  • Vibratory polishing
  • Soft metal laps
  • Hard metal laps
  • Composite polishing plates
  • Optical polishing

Surfaces produced can be lapped to a dull matte finish, or can be highly polished to a mirror finish and multiple other surface finishes in between. For example, on Aluminum Nitride, a standard lapped finish is 25u” Ra, and a standard polished finish is 1-2u” Ra.