Hermetic Seal Glass

• Draw Process
  • Redraw process is a very economical way to produce beads when raw material is available as tubing.
  • Melt process is used for glasses which are only available only in billet or strip form.
• Glass Types
  • Corning
    • 7740
    • 7052
  • Kimble
    • EN-1
    • KG-33
  • Schott
    • 8250
    • 8340
    • 8347
    • 8350
    • Duran
    • AR
    • NBk-7
    • S-8060 (TA-23)
    • S-8072 (Cabal-12)
  • NEG
    • SRI
  • Heraus
    • Quartz
• End Condition
  • Saw – standard
  • Grind – when fine finish is required
  • Grind and Polish
  • Fire Polish – eliminate particulate shedding from the sawed end, and smooths the edges.
• Hermetic Seal Glass Size Capability
  • Generally outside diameters (OD) up to 0.250″ are available.  Inside diameters (ID) from microscopic up to 80% of the Od are standard, thinner walls require special processing.
  • Sawed/Ground/Polished/fire polished lengths up to 5″ are standard.  Longer lengths possible with scribe and break ends.
• Tolerance Capability
  • Inside and Outside diameter bilateral tolerances of ± 2% is standard, 1% special (within measuring capability).
  • Centerless Ground OD ± 0.0002 is available.
  • Length bilateral tolerances of ± 0.003″ to 0.001″ is availble depending on size.

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