Flint Glass

Flint glass is combination of silicon dioxide (SiO2) with lead or potassium. It creates a relatively high refractive index and high degree of light dispersing power compared to other types of glass. Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less. Flint glasses have refractive indices ranging between 1.45 and 2.00.As a result, this blend of glass is characterized by its brilliance and luminosity. This property makes flint glass especially desirable in the production of lenses, optical instruments, and prisms. In modern flint glass, lead oxides are replaced with other metal oxides such as titanium dioxide and zirconium dioxide without significantly altering the optical properties of the glass. 

SCHOTT SF Optical Glass

Schott offers over 120 types of optical glasses grouped by similar chemical composition.  From traditional lead oxide materials, arsenic free N-glasses, and high transmission glasses designated “HT” or “HTultra”, Schott covers the entire standard range of refractive indices and dispersion values. On request, they also provide materials with more tightly controlled homogeneity for high precision applications.

Manufacturer's Material Data (PDFs)

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