i-Line Glass

Product Information

i-Line glass - for applications requiring high uv-transmittance

i-Line glasses are optical glass types named after the i-wavelength, which offer both high UV-transmittance at 365 nm and high refractive index homogeneity. These glass types, such as N-BK7HTi, FK5HTi, LF5HTi and LLF1HTi are available in customized shapes and as a final component.


  • High refractive index homogeneity (PV < 0.5 ppm at 200 mm diameter)
  • Excellent internal quality
  • Negligible stress birefringence due to a well-defined annealing process
  • Variation of absolute refractive index values per lot of less than 5 x 10-5
  • Availability of a wide range of high transmission glass types ensures high flexibility in optical designs

Supply Forms

i-Line glass is available as:
Supply Forms
Customized shapes
  • CNC machined
  • coated
  • polished
  • sub-assembled
Diameter: up to 300 mm
Thicknesses: up to 100 mm

* Customized dimensions are possible. Please contact us.
We also offer high-precision optical components made of i-Line glass.

Technical Information


Homogeneity, bubbles/inclusions, and dispersion values according to the ‘Optical Glass - Catalogue', which you can find under Downloads.

Quality Assurance
  • i-Line glass is subject to a 100% control of homogeneity, stress birefringence, striae, bubbles, and inclusions
  • Refractive index and transmittance are statistically controlled
SCHOTT North America, Inc.
400 York Avenue
Duryea, PA 18642
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