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Sapphire Grades

Grade 1 Sapphire

Inclusions, lineage, bubbles and twins are not permitted.

Grade 2 Sapphire

Inclusions, lineage and twins are not permitted. Micro bubbles with a diameter of 10 microns or less are permitted. (Bubbles less than 10 microns are generally not visible with the naked eye).

Grade 3 Sapphire

Inclusions, lineage and twins are not permitted. Uniformly distributed bubbles not larger than 50 microns in diameter and not closer in distance between bubbles than 500 microns are permitted.

Grade 4 Sapphire

Inclusions, lineage and twins are not permitted. Uniformly distributed bubbles not larger than 50 microns in diameter and not closer in distance between bubbles than 500 microns are permitted. Concentrations of micro bubbles not larger than 200 microns in diameter overall and not closer than 20mm between concentrations of micro bubbles are permitted.

Grade 5 Sapphire

Inclusions, lineage and twins are not permitted. Uniformly distributed bubbles not larger than 50 microns in diameter and not closer in distance between bubbles than 500 microns are permitted. Concentrations of micro bubbles not larger than 500 microns in diameter overall and not closer than 20mm between concentrations of micro bubbles are permitted.

Grade 6 Sapphire

Inclusions, lineage and twins are not permitted. Lineage with a disorientation angle smaller than 20mm is permitted. Bubbles and concentrations of micro bubbles not larger than 500 microns in diameter overall and not closer than 20mm between concentrations of micro bubbles are permitted.

Grade 7 Sapphire

Bubbles and concentration of micro bubbles not larger than 500 microns are permitted. Inclusions, twins and lineage are permitted.

Grade 8 Sapphire

All types of defects other than cracks are permitted.

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Meller Optics, Inc.

120 Corliss Street
Providence, RI 02904
800-821-0180
melleroptics.com

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  • Home
  • News
  • Shop
    • Sapphire Product Line
      • Sapphire Windows
      • Standard Quality Sapphire Windows
      • Superior Quality Sapphire Windows
      • High-Precision Quality Sapphire Windows
      • Sapphire Substrates
      • Sapphire Precision Balls
      • Sapphire Wafer Carriers
      • Sapphire & Quartz Waveplates
      • Sapphire Domes
      • Sapphire Lenses
      • Sapphire Prisms
    • Polishing Compounds
      • Alumina Polishing Compounds
      • Gugolz Polishing Pitch
    • Custom Fabrication
    • Overrun List
    • CO2 Laser Optics
  • Information
    • Technical Data for Sapphire Optics
    • Learn About Sapphire Optics
  • Capabilities
  • About
  • Contact
    • Contact Meller Optics
    • Request A Quote

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