Microscopy – Cover Slips (Coverslides)

Cover Glass for Microscopy – D 263® M


D 263® M is a transparent borosilicate glass manufactured through a draw-down method, allowing the production of extremely thin glass thicknesses ranging from 0.10 to 0.21 mm.

Primarily employed as a cover glass for microscopic analyses, D 263® M adheres to the specifications outlined in ISO 8255-1 (International Organization for Standardization). Its low autofluorescence and impressive chemical resistance make it a preferred choice for ensuring reliable research outcomes. The protective coating and high-quality material allow for easy separation, making it suitable for use with automated cover slipping equipment.


Light and fluorescence microscopy, especially in medical and biological science

  • high spectral transmission
  • refractive index optimized for microscopes
  • virtually colorless appearance
  • low autofluorescence
  • excellent optical and cosmetic quality
  • good chemical resistance to environmental conditions facilitates long durability in archiving samples
  • low flatness deviations
  • complies precisely with the set thickness tolerances
  • low alkali content enables cell growth
  • good wettability on both glass surfaces
  • protective coating facilitates automated separation of individual cover glasses in coverslippers

Cover Glasses Square and Rectangular

Marienfeld Superior cover glasses are characterized by their exceptional flatness and smooth surfaces, achieved through the use of high-quality borosilicate glass. Outperforming soda lime glass cover glasses, Marienfeld Superior cover glasses ensure superior optical quality for prepared slides even after years of archiving, thanks to the non-corroding nature of the glass and the minimal tolerance in material thickness.

These coverslips undergo precise machining processes, ensuring accurate sizing and precise edges. Their efficient manufacturing processes are accompanied by a rigorous integrated quality control system, guaranteeing high-quality coverslips that do not stick together.

Ready for immediate use, Marienfeld Superior coverslips are well-suited for applications in automated coverslippers, offering significant advantages to users.

  • made of chemically resistant borosilicate glass D 263® M of the first hydrolytic class
  • absolutely colourless, perfectly clear, suitable for fluorescence microscopy
  • for applications according to EU regulation 2017/746 on in vitro diagnostic medical devices (IVDR), with CE-mark and batch number for comprehensive information and traceability

Cover Glasses Circular

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