Flint glass

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Celery glass
MFA# 1975.20


An optical quality glass with a high refractive index and low dispersion. Flint glass was a typically a Potash-lead glass used for optical lenses and crystal glassware. However, since the manufacture and disposal of leaded glass is a source of pollution, modern flint glass contains a wide variety of non-lead metal oxides including Titanium dioxide and Zirconium oxide. Flint glass is used for lenses in microscopes, telescopes, binoculars, cameras, prisms, and other imagining instruments.

See also crystal.

Synonyms and Related Terms

cristal de chumbo com potássio (Port.)

Bishop mug
MFA# 1995.765

Physical and Chemical Properties

Melting Point 630 C (softens)
Density 2.9-5.9 g/ml
Refractive Index 1.45-2.00

Resources and Citations

  • Wikipedia: Flint glass (Accessed Oct. 2023)
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 383
  • Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996