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D 263™ M Cover glass

D 263™ M is a clear borosilicate glass that is produced by a draw-down method. This allows for very thin thicknesses between 0.10 and 0.21 mm. D 263™ M is used as a cover glass for microscopic analyses and complies to the requirements of ISO 8255-1. The low autofluorescence and the chemical resistance are preconditions for reliable research results.


Light and fluorescence microscopy, especially in medical and biological science


  • high spectral transmission
  • virtually colourless appearance
  • excellent optical quality
  • low flatness deviations
  • good chemical resistance
  • refractive index fine-tuned to microscopes
  • low autofluorescence
  • protective coating facilitates automated separation of individual coverglasses in coverslippers
  • complies precisely with the set thickness tolerances
  • persistency at changing climatic conditions
  • low alkaline strength enables good cell growth
Technical data acc. to Schott AG:  
Light transmission ƬvD65 (d = 0.15 mm) 91,7 % (± 0,1 %)
Coefficient of mean linear thermal expansion α (20 °C; 300 °C) (static measurement) 7,2 · 10-6 K-1
Transformation temperature Tg 557 °C
Dielectric constant εr at 1 MHz 6,7
Refractive index nD 1,5230
Refractive index ne 1,5255
Abbe value ve 55
Density ρ (annealed at 40 °C/h) 2,51 g/cm3