D 263^® M Cover Glass

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Product Information

Colorless Borosilicate Glass for flawless Miscroscopy

D 263^® M is a colorless borosilicate glass that SCHOTT manufactures with the help of a special down-draw method. It is available from stock in various sheet sizes and thicknesses ranging from 0.1 mm to 0.21 mm.

D 263^® M is the perfect choice as cover glass for microscopic analysis and meets the requirements specified in ISO 8255-1 and DIN ISO 8255-1.

The chemical composition of D 263^® M ensures valid and reliable research results due to its low auto-fluorescence and high chemical resistance.

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Advantages

High luminous transmittance
Colorless appearance
Excellent cosmetic quality
Easy to cut
Outstanding flatness
Resistant to chemical attacks
Refractive index finely tuned to microscopes
Low autofluorescence
Easy to separate in automatic cover-slipping equipment thanks to its protective coating
Precise thickness control
Resistance to environmental conditions ensures high durability
Good cell growth
Thicknesses available for high-performance applications

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Forms of Supply

D 263^® M cover glass is available as:

Supply Forms	Thicknesses	Standard Thicknesses	Dimensions
Substrates	0.10 mm up to 0.21 mm	0.1 mm 0.145 mm 0.175 mm 0.210 mm	410 mm x 435 mm 410 mm x 415 mm 410 mm x 710 mm

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Technical Details

Technical Data
Dimensions	410 mm x 435 mm 410 mm x 415 mm 410 mm x 710 mm
Thicknesses	0.10 mm up to 0.21 mm
Luminous transmittance τ_vD65(d = 0.15 mm)	91.7%
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 n_D	1.5230
Refractive index n_e	1.5255
Density ρ (annealed at 40 °C/h)	2.51 g/cm³

Spectral transmittance (d = 0.15 mm)

Spectral transmission of SCHOTT D 263® M Cover Glass

The light transmittance is τVA = 91.8% with glass thicknesses of between 0.15 und 0.40 mm. D 263^® M experiences no absorption in the visible range of the spectrum. The excellent UV absorption properties make D 263^® M the ideal material for use in fluorescence microscopy.

Dimensions (as used in typical medical industry applications)

Thickness in mm¹⁾, mils			Sizes in mm, inches			Flatness in mm²⁾, inches
Nr.	Minimum	Maximum	Raw glass (with bead)	Maximum usable net width (without bead)	Length
0	0.085 mm 3.35 mils	0.115 mm 4.53 mils	410±20 mm 16.14±0.79 in.	360-15 mm 14.17-0.59 in.	435±10 mm 17.13±0.39 in.	typically < 5.0 mm <0.20 in.
1	0.13 mm 5.12 mils	0.16 mm 6.30 mils	410±20 mm 16.14±0.79 in.	380-15 mm 14.96-0.59 in.	435±10 mm 17.13±0.39 in.	typically < 5.0 mm <0.20 in.
1.5	0.16 mm 6.30 mils	0.19 mm 7.48 mils	410±20 mm 16.14±0.79 in.	380-15 mm 14.96-0.59 in.	435±10 mm 17.13±0.39 in.	typically < 5.0 mm <0.20 in.
2	0.19 mm 7.48 mils	0.23 mm 9.06 mils	410±20 mm 16.14±0.79 in.	380-15 mm 14.96-0.59 in.	435±10 mm 17.13±0.39 in.	typically < 5.0 mm <0.20 in.

Other thicknesses available upon request.
All data subject to change.

¹⁾The accuracy of thickness measurement is ± 5 μm
²⁾For the maximum usable net width (without bead), flatness is measured net width x length. The maximum deviation in height at any point on the entire surface of the glass panel is measured from an ideal plane surface. The maximum calculated value serves as the index for determining the deviation in flatness. At the same time, it does not include the nominal thickness of the glass panel.

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